gnuplot-info — For questions and discussion about gnuplot

[Gnuplot-info] KeyForSplotContoursFromMatrix

[Geoff K. <ge...@ka...>]

My code for setting up a contour plot of matrix data is:

reset session
set datafile missing "?.????"
set xtics ...; set ytics ...

set zrange [-1.:1.0] set ztics -1.0, 0.1, 1.0 format "%3.1f";

unset key;
ltitle = "   {/Symbol l}_{xy}"
set key outside title ltitle offset -4.0, -0.2

set view map; set contour; set xyplane 0.0
set grid; set cntrparam levels 20; set isosamples 150

splot [X_min:X_max][Y_min:Y_max] 'matrixdata' nonuniform matrix 
nosurface title " " w linesp

All works as expected apart from the key:

1. The format of the z values is d.d, apart from z=0.0: displayed as "0"
How do I format the z values in the key?

2. The plot shows the contour lines with data point symbols. These are 
missing from the key.
Can splot show the data point symbols, or do I have to create my own key 
using set object?

You can view the plot image at www.kaniuk.co.uk/gptest/splot-contour.eps
If you need to see the exact .gp script I can provide that.

Your help is much appreciated!

Geoff

Re: [Gnuplot-info] SOLVEDSurfacePlotDataMatrixProducesAxesNoSurface

[Geoff K. <ge...@ka...>]

Thank you! I added 'w linesp' to the splot command.  I found that in my 
case 'nocontours' was not needed. The main missing setting was 
'nonuniform matrix'.

So Ethan, thank you very much for the help.

Geoff

On 23/09/2026 21:44, Ethan Merritt wrote:
> You were close.  The 'missing' corner of the input matrix data is 
> ignored but must be present (i.e. non-blank).
> 
> Here is an example showing both the data format and the addition of 
> contour lines on the surface. For clarity I draw the surface and the 
> contours in separate clauses of the splot command.  This also allows me 
> to specify thicker lines for the contours.
> 
> On Wed, Sep 23, 2026 at 11:48 AM Geoff Kaniuk <ge...@ka... 
> <mailto:ge...@ka...>> wrote:
> 
>     Yes, today the plane was in the right position with no change in code.
> 
>     Regarding the matrix format, I have seen examples in "Gnuplot in
>     Action"
>     and web searches, which I copied. I have now added the Y coordinate row
>     and X coordinate column - but this still left an empty surface.
> 
>     In my example, x and y start at the same value, so I was able to set
>     M00
>     to -19.0.  But there seems to be an issue if the ranges have different
>     start points: eg  y in [1.0,4.0], x in [0.2,0.6]
>     ??  1.0 2.0 3.0 4.0
>     0.2  a   b   c   d
>     0.4  b   c   d   a
>     0.6  c   d   a   b
> 
>     What value would ?? be?  I tried omotting it and then get the 'data is
>     not a matrix message'
> 
>     I was hoping to find a show command which tells me what gnuplot decides
>     its zrange is, but show zrange says numeric.
> 
>     Why should Gnuplot think I want to do anything other than plot the
>     surface showing coordinate lines?
>     I noticed in my code that I had omiited 'set surface'.  I have now
>     added
>     that to no effect.
> 
>     Is there anything I should be setting to display the surface?
> 
>     You, of course, are right that I do actually want to see the contour
>     map. That is how I started with all the settings that are needed for
>     that. When I got nowhere, I decided to simplify and just plot the
>     surface, then the cotour could follow.
> 
>     In the meantime I really do want to get this surface map working.
> 
>     There must be some basic setting I am missing?
> 
>     Geoff
> 
>     On 23/09/2026 04:40, Ethan Merritt wrote:
>      > The easy part first.
>      >
>      > The "set xyplane" command has two forms.
>      > "set xyplane <foo>"  interprets <foo> as some fraction of the
>     current z-
>      > range and places the plane at that fraction of the zrange (I
>     never use
>      > this and may have described it slightly wrong)
>      > "set xyplane at <zval>" does exactly what it looks like - places the
>      > plane at z=zval.
>      >
>      > Now the matrix.
>      > You have provided a matrix that contains only z values, no x or y.
>      > The program plots it assuming x = column_number, y = row_number.
>      > See "help matrix".
>      > So your surface is drawn in the area bounded by x=[0:8] and y=[0:8]
>      >
>      > I am assuming that you want to map it instead onto the x and y
>     ranges
>      > you have specified, but it is not clear to me (or to the program)
>     how
>      > you want to do that.   Without additional information about the
>     eventual
>      > use case and data source, it's hard to given specific suggestions
>     on how
>      > to proceed.
>      >
>      > One option is to accept that the program will use xrange [0:8],
>     as in
>      > your example, but manually adjust the labels on the x axis:
>      >      set xtics ("-18.5" 0,  "-13.5" 8)
>      > And so on for the y axis labels.   That puts the burden on you to
>     sort
>      > out what the labels should be, so it's probably not the best
>     solution.
>      >
>      > Another option is to reformat the data so that it is contains x
>     and y
>      > coordinates as well as z.  There are at least two different formats
>      > accepted by gnuplot that should work.  See "help matrix uniform"
>     "help
>      > matrix nonuniform".
>      >   - Ethan
>      >
>      > On Tue, Sep 22, 2026 at 4:08 PM Geoff Kaniuk <ge...@ka...
>     <mailto:ge...@ka...>
>      > <mailto:ge...@ka... <mailto:ge...@ka...>>> wrote:
>      >
>      >     I am attempting to plot a surface from data in a file. The plot
>      >     produced
>      >     shows the correct X,Y, Z axes and key. But no surface and the
>     base
>      >     plane
>      >     is not where I expect it to be.
>      >
>      >     For simplicity I am testing with the data inline using:
>      >     splot [X_min:X_max][Y_min:Y_max] '-' matrix
>      >     0.0046  -0.067  -0.1375 -0.2081 -0.2587 -0.3094 -0.3702
>     -0.4311 -0.495
>      >     0.097   0.026   -0.043  -0.1129 -0.1617 -0.2087 -0.2577
>     -0.3123 -0.3891
>      >     0.1774  0.0877  0.0226  -0.0425 -0.1011 -0.1598 -0.2069
>     -0.254  -0.3127
>      >     0.2578  0.1498  0.0882  0.0278  -0.0405 -0.1085 -0.1561
>     -0.1989 -0.2363
>      >     0.3034  0.2022  0.1448  0.0875  0.0233  -0.0408 -0.0947
>     -0.1486 -0.1892
>      >     0.3491  0.2587  0.2015  0.1438  0.0872  0.0285  -0.0333
>     -0.0951 -0.1421
>      >     0.4093  0.3214  0.256   0.1905  0.1377  0.085   0.0251 
>     -0.0349 -0.0886
>      >     0.4695  0.3912  0.3104  0.2381  0.1883  0.1378  0.0834 
>     0.0263  -0.0351
>      >     0.47660 0.4624  0.3798  0.2972  0.2372  0.1772  0.1293 
>     0.0814  0.0225
>      >
>      >     The preamble and  splot call is contained in a gp script file
>     like so:
>      >     [plot-xy-surface.gp <http://plot-xy-surface.gp> <http://plot-
>     xy-surface.gp <http://plot-xy-surface.gp>>]
>      >     #!/usr/bin/gnuplot -persist
>      >     reset session
>      >     set terminal wxt 1 persist enhanced
>      >
>      >     X_min=-18.5; X_max=-13.5; Y_min=-18.5; Y_max=-13.5;
>      >     Z_min=-0.6; Z_max=0.6
>      >
>      >     unset xtics;
>      >     set xrange [X_min:X_max]; set xtics X_min,0.5,X_max; set
>     xlabel "X"
>      >     unset ytics;
>      >     set yrange [Y_min:Y_max]; set ytics Y_min,0.5,Y_max; set
>     ylabel "Y"
>      >     set zrange [Z_min:Z_max]; set ztics Z_min,0.1,Z_max; set
>     zlabel "Z"
>      >
>      >     unset key; set key outside
>      >
>      >     set xyplane 0.0
>      >     set grid; set cntrparam levels 13; set isosamples 100
>      >     splot ....
>      >
>      >     The terminal session is:
>      >     gnuplot> call "plot-xy-surface.gp <http://plot-xy-surface.gp>
>     <http://plot-xy-surface.gp <http://plot-xy-surface.gp>>"
>      >     gnuplot> show surface
>      >              surface is drawn
>      >
>      >     I have tried many variations, and have now drawn a blank!  As
>     mentioned
>      >     above there is no surface, and the base plane is set at Z_min
>     rather
>      >     than 0.0 as requested!
>      >
>      >     Is there any option that I should be turning on or indeed off?
>      >
>      >     For reference:
>      >     GNUPLOT:        gnuplot 5.4 patchlevel 4
>      >     OS:             Debian 12  bookworm
>      >     DESKTOP         Mate 1.26.0
>      >
>      >     I have no problem using splot with functions.
>      >
>      >     Any input much appreciated.
>      >
>      >     --
>      >     Geoff
>      >
>      >
>      >
>      >     _______________________________________________
>      >     gnuplot-info mailing list
>      > gnu...@li... <mailto:gnuplot-
>     in...@li...> <mailto:gnuplot- <mailto:gnuplot->
>      > in...@li... <mailto:in...@li...>>
>      >     Membership management via: https://lists.sourceforge.net/
>     lists/ <https://lists.sourceforge.net/lists/>
>      >     listinfo/gnuplot-info <https://lists.sourceforge.net/lists/
>     listinfo/ <https://lists.sourceforge.net/lists/listinfo/>
>      >     gnuplot-info>
>      >
> 

Re: [Gnuplot-info] SurfacePlotDataMatrixProducesAxesNoSurface

[Ethan M. <eam...@gm...>]

You were close.  The 'missing' corner of the input matrix data is ignored
but must be present (i.e. non-blank).

Here is an example showing both the data format and the addition of contour
lines on the surface. For clarity I draw the surface and the contours in
separate clauses of the splot command.  This also allows me to specify
thicker lines for the contours.

On Wed, Sep 23, 2026 at 11:48 AM Geoff Kaniuk <ge...@ka...> wrote:

> Yes, today the plane was in the right position with no change in code.
>
> Regarding the matrix format, I have seen examples in "Gnuplot in Action"
> and web searches, which I copied. I have now added the Y coordinate row
> and X coordinate column - but this still left an empty surface.
>
> In my example, x and y start at the same value, so I was able to set M00
> to -19.0.  But there seems to be an issue if the ranges have different
> start points: eg  y in [1.0,4.0], x in [0.2,0.6]
> ??  1.0 2.0 3.0 4.0
> 0.2  a   b   c   d
> 0.4  b   c   d   a
> 0.6  c   d   a   b
>
> What value would ?? be?  I tried omotting it and then get the 'data is
> not a matrix message'
>
> I was hoping to find a show command which tells me what gnuplot decides
> its zrange is, but show zrange says numeric.
>
> Why should Gnuplot think I want to do anything other than plot the
> surface showing coordinate lines?
> I noticed in my code that I had omiited 'set surface'.  I have now added
> that to no effect.
>
> Is there anything I should be setting to display the surface?
>
> You, of course, are right that I do actually want to see the contour
> map. That is how I started with all the settings that are needed for
> that. When I got nowhere, I decided to simplify and just plot the
> surface, then the cotour could follow.
>
> In the meantime I really do want to get this surface map working.
>
> There must be some basic setting I am missing?
>
> Geoff
>
> On 23/09/2026 04:40, Ethan Merritt wrote:
> > The easy part first.
> >
> > The "set xyplane" command has two forms.
> > "set xyplane <foo>"  interprets <foo> as some fraction of the current z-
> > range and places the plane at that fraction of the zrange (I never use
> > this and may have described it slightly wrong)
> > "set xyplane at <zval>" does exactly what it looks like - places the
> > plane at z=zval.
> >
> > Now the matrix.
> > You have provided a matrix that contains only z values, no x or y.
> > The program plots it assuming x = column_number, y = row_number.
> > See "help matrix".
> > So your surface is drawn in the area bounded by x=[0:8] and y=[0:8]
> >
> > I am assuming that you want to map it instead onto the x and y ranges
> > you have specified, but it is not clear to me (or to the program) how
> > you want to do that.   Without additional information about the eventual
> > use case and data source, it's hard to given specific suggestions on how
> > to proceed.
> >
> > One option is to accept that the program will use xrange [0:8], as in
> > your example, but manually adjust the labels on the x axis:
> >      set xtics ("-18.5" 0,  "-13.5" 8)
> > And so on for the y axis labels.   That puts the burden on you to sort
> > out what the labels should be, so it's probably not the best solution.
> >
> > Another option is to reformat the data so that it is contains x and y
> > coordinates as well as z.  There are at least two different formats
> > accepted by gnuplot that should work.  See "help matrix uniform" "help
> > matrix nonuniform".
> >   - Ethan
> >
> > On Tue, Sep 22, 2026 at 4:08 PM Geoff Kaniuk <ge...@ka...
> > <mailto:ge...@ka...>> wrote:
> >
> >     I am attempting to plot a surface from data in a file. The plot
> >     produced
> >     shows the correct X,Y, Z axes and key. But no surface and the base
> >     plane
> >     is not where I expect it to be.
> >
> >     For simplicity I am testing with the data inline using:
> >     splot [X_min:X_max][Y_min:Y_max] '-' matrix
> >     0.0046  -0.067  -0.1375 -0.2081 -0.2587 -0.3094 -0.3702 -0.4311
> -0.495
> >     0.097   0.026   -0.043  -0.1129 -0.1617 -0.2087 -0.2577 -0.3123
> -0.3891
> >     0.1774  0.0877  0.0226  -0.0425 -0.1011 -0.1598 -0.2069 -0.254
> -0.3127
> >     0.2578  0.1498  0.0882  0.0278  -0.0405 -0.1085 -0.1561 -0.1989
> -0.2363
> >     0.3034  0.2022  0.1448  0.0875  0.0233  -0.0408 -0.0947 -0.1486
> -0.1892
> >     0.3491  0.2587  0.2015  0.1438  0.0872  0.0285  -0.0333 -0.0951
> -0.1421
> >     0.4093  0.3214  0.256   0.1905  0.1377  0.085   0.0251  -0.0349
> -0.0886
> >     0.4695  0.3912  0.3104  0.2381  0.1883  0.1378  0.0834  0.0263
> -0.0351
> >     0.47660 0.4624  0.3798  0.2972  0.2372  0.1772  0.1293  0.0814
> 0.0225
> >
> >     The preamble and  splot call is contained in a gp script file like
> so:
> >     [plot-xy-surface.gp <http://plot-xy-surface.gp>]
> >     #!/usr/bin/gnuplot -persist
> >     reset session
> >     set terminal wxt 1 persist enhanced
> >
> >     X_min=-18.5; X_max=-13.5; Y_min=-18.5; Y_max=-13.5;
> >     Z_min=-0.6; Z_max=0.6
> >
> >     unset xtics;
> >     set xrange [X_min:X_max]; set xtics X_min,0.5,X_max; set xlabel "X"
> >     unset ytics;
> >     set yrange [Y_min:Y_max]; set ytics Y_min,0.5,Y_max; set ylabel "Y"
> >     set zrange [Z_min:Z_max]; set ztics Z_min,0.1,Z_max; set zlabel "Z"
> >
> >     unset key; set key outside
> >
> >     set xyplane 0.0
> >     set grid; set cntrparam levels 13; set isosamples 100
> >     splot ....
> >
> >     The terminal session is:
> >     gnuplot> call "plot-xy-surface.gp <http://plot-xy-surface.gp>"
> >     gnuplot> show surface
> >              surface is drawn
> >
> >     I have tried many variations, and have now drawn a blank!  As
> mentioned
> >     above there is no surface, and the base plane is set at Z_min rather
> >     than 0.0 as requested!
> >
> >     Is there any option that I should be turning on or indeed off?
> >
> >     For reference:
> >     GNUPLOT:        gnuplot 5.4 patchlevel 4
> >     OS:             Debian 12  bookworm
> >     DESKTOP         Mate 1.26.0
> >
> >     I have no problem using splot with functions.
> >
> >     Any input much appreciated.
> >
> >     --
> >     Geoff
> >
> >
> >
> >     _______________________________________________
> >     gnuplot-info mailing list
> >     gnu...@li... <mailto:gnuplot-
> >     in...@li...>
> >     Membership management via: https://lists.sourceforge.net/lists/
> >     listinfo/gnuplot-info <https://lists.sourceforge.net/lists/listinfo/
> >     gnuplot-info>
> >
>
>

Re: [Gnuplot-info] SurfacePlotDataMatrixProducesAxesNoSurface

[Geoff K. <ge...@ka...>]

Yes, today the plane was in the right position with no change in code.

Regarding the matrix format, I have seen examples in "Gnuplot in Action" 
and web searches, which I copied. I have now added the Y coordinate row 
and X coordinate column - but this still left an empty surface.

In my example, x and y start at the same value, so I was able to set M00 
to -19.0.  But there seems to be an issue if the ranges have different 
start points: eg  y in [1.0,4.0], x in [0.2,0.6]
??  1.0 2.0 3.0 4.0
0.2  a   b   c   d
0.4  b   c   d   a
0.6  c   d   a   b

What value would ?? be?  I tried omotting it and then get the 'data is 
not a matrix message'

I was hoping to find a show command which tells me what gnuplot decides 
its zrange is, but show zrange says numeric.

Why should Gnuplot think I want to do anything other than plot the 
surface showing coordinate lines?
I noticed in my code that I had omiited 'set surface'.  I have now added 
that to no effect.

Is there anything I should be setting to display the surface?

You, of course, are right that I do actually want to see the contour 
map. That is how I started with all the settings that are needed for 
that. When I got nowhere, I decided to simplify and just plot the 
surface, then the cotour could follow.

In the meantime I really do want to get this surface map working.

There must be some basic setting I am missing?

Geoff

On 23/09/2026 04:40, Ethan Merritt wrote:
> The easy part first.
> 
> The "set xyplane" command has two forms.
> "set xyplane <foo>"  interprets <foo> as some fraction of the current z- 
> range and places the plane at that fraction of the zrange (I never use 
> this and may have described it slightly wrong)
> "set xyplane at <zval>" does exactly what it looks like - places the 
> plane at z=zval.
> 
> Now the matrix.
> You have provided a matrix that contains only z values, no x or y.
> The program plots it assuming x = column_number, y = row_number.
> See "help matrix".
> So your surface is drawn in the area bounded by x=[0:8] and y=[0:8]
> 
> I am assuming that you want to map it instead onto the x and y ranges 
> you have specified, but it is not clear to me (or to the program) how 
> you want to do that.   Without additional information about the eventual 
> use case and data source, it's hard to given specific suggestions on how 
> to proceed.
> 
> One option is to accept that the program will use xrange [0:8], as in 
> your example, but manually adjust the labels on the x axis:
>      set xtics ("-18.5" 0,  "-13.5" 8)
> And so on for the y axis labels.   That puts the burden on you to sort 
> out what the labels should be, so it's probably not the best solution.
> 
> Another option is to reformat the data so that it is contains x and y 
> coordinates as well as z.  There are at least two different formats 
> accepted by gnuplot that should work.  See "help matrix uniform" "help 
> matrix nonuniform".
>   - Ethan
> 
> On Tue, Sep 22, 2026 at 4:08 PM Geoff Kaniuk <ge...@ka... 
> <mailto:ge...@ka...>> wrote:
> 
>     I am attempting to plot a surface from data in a file. The plot
>     produced
>     shows the correct X,Y, Z axes and key. But no surface and the base
>     plane
>     is not where I expect it to be.
> 
>     For simplicity I am testing with the data inline using:
>     splot [X_min:X_max][Y_min:Y_max] '-' matrix
>     0.0046  -0.067  -0.1375 -0.2081 -0.2587 -0.3094 -0.3702 -0.4311 -0.495
>     0.097   0.026   -0.043  -0.1129 -0.1617 -0.2087 -0.2577 -0.3123 -0.3891
>     0.1774  0.0877  0.0226  -0.0425 -0.1011 -0.1598 -0.2069 -0.254  -0.3127
>     0.2578  0.1498  0.0882  0.0278  -0.0405 -0.1085 -0.1561 -0.1989 -0.2363
>     0.3034  0.2022  0.1448  0.0875  0.0233  -0.0408 -0.0947 -0.1486 -0.1892
>     0.3491  0.2587  0.2015  0.1438  0.0872  0.0285  -0.0333 -0.0951 -0.1421
>     0.4093  0.3214  0.256   0.1905  0.1377  0.085   0.0251  -0.0349 -0.0886
>     0.4695  0.3912  0.3104  0.2381  0.1883  0.1378  0.0834  0.0263  -0.0351
>     0.47660 0.4624  0.3798  0.2972  0.2372  0.1772  0.1293  0.0814  0.0225
> 
>     The preamble and  splot call is contained in a gp script file like so:
>     [plot-xy-surface.gp <http://plot-xy-surface.gp>]
>     #!/usr/bin/gnuplot -persist
>     reset session
>     set terminal wxt 1 persist enhanced
> 
>     X_min=-18.5; X_max=-13.5; Y_min=-18.5; Y_max=-13.5;
>     Z_min=-0.6; Z_max=0.6
> 
>     unset xtics;
>     set xrange [X_min:X_max]; set xtics X_min,0.5,X_max; set xlabel "X"
>     unset ytics;
>     set yrange [Y_min:Y_max]; set ytics Y_min,0.5,Y_max; set ylabel "Y"
>     set zrange [Z_min:Z_max]; set ztics Z_min,0.1,Z_max; set zlabel "Z"
> 
>     unset key; set key outside
> 
>     set xyplane 0.0
>     set grid; set cntrparam levels 13; set isosamples 100
>     splot ....
> 
>     The terminal session is:
>     gnuplot> call "plot-xy-surface.gp <http://plot-xy-surface.gp>"
>     gnuplot> show surface
>              surface is drawn
> 
>     I have tried many variations, and have now drawn a blank!  As mentioned
>     above there is no surface, and the base plane is set at Z_min rather
>     than 0.0 as requested!
> 
>     Is there any option that I should be turning on or indeed off?
> 
>     For reference:
>     GNUPLOT:        gnuplot 5.4 patchlevel 4
>     OS:             Debian 12  bookworm
>     DESKTOP         Mate 1.26.0
> 
>     I have no problem using splot with functions.
> 
>     Any input much appreciated.
> 
>     -- 
>     Geoff
> 
> 
> 
>     _______________________________________________
>     gnuplot-info mailing list
>     gnu...@li... <mailto:gnuplot-
>     in...@li...>
>     Membership management via: https://lists.sourceforge.net/lists/
>     listinfo/gnuplot-info <https://lists.sourceforge.net/lists/listinfo/
>     gnuplot-info>
> 

Re: [Gnuplot-info] SurfacePlotDataMatrixProducesAxesNoSurface

[Ethan M. <eam...@gm...>]

The easy part first.

The "set xyplane" command has two forms.
"set xyplane <foo>"  interprets <foo> as some fraction of the current
z-range and places the plane at that fraction of the zrange (I never use
this and may have described it slightly wrong)
"set xyplane at <zval>" does exactly what it looks like - places the plane
at z=zval.

Now the matrix.
You have provided a matrix that contains only z values, no x or y.
The program plots it assuming x = column_number, y = row_number.
See "help matrix".
So your surface is drawn in the area bounded by x=[0:8] and y=[0:8]

I am assuming that you want to map it instead onto the x and y ranges you
have specified, but it is not clear to me (or to the program) how you want
to do that.   Without additional information about the eventual use case
and data source, it's hard to given specific suggestions on how to proceed.

One option is to accept that the program will use xrange [0:8], as in your
example, but manually adjust the labels on the x axis:
    set xtics ("-18.5" 0,  "-13.5" 8)
And so on for the y axis labels.   That puts the burden on you to sort out
what the labels should be, so it's probably not the best solution.

Another option is to reformat the data so that it is contains x and y
coordinates as well as z.  There are at least two different formats
accepted by gnuplot that should work.  See "help matrix uniform" "help
matrix nonuniform".

 - Ethan

On Tue, Sep 22, 2026 at 4:08 PM Geoff Kaniuk <ge...@ka...> wrote:

> I am attempting to plot a surface from data in a file. The plot produced
> shows the correct X,Y, Z axes and key. But no surface and the base plane
> is not where I expect it to be.
>
> For simplicity I am testing with the data inline using:
> splot [X_min:X_max][Y_min:Y_max] '-' matrix
> 0.0046  -0.067  -0.1375 -0.2081 -0.2587 -0.3094 -0.3702 -0.4311 -0.495
> 0.097   0.026   -0.043  -0.1129 -0.1617 -0.2087 -0.2577 -0.3123 -0.3891
> 0.1774  0.0877  0.0226  -0.0425 -0.1011 -0.1598 -0.2069 -0.254  -0.3127
> 0.2578  0.1498  0.0882  0.0278  -0.0405 -0.1085 -0.1561 -0.1989 -0.2363
> 0.3034  0.2022  0.1448  0.0875  0.0233  -0.0408 -0.0947 -0.1486 -0.1892
> 0.3491  0.2587  0.2015  0.1438  0.0872  0.0285  -0.0333 -0.0951 -0.1421
> 0.4093  0.3214  0.256   0.1905  0.1377  0.085   0.0251  -0.0349 -0.0886
> 0.4695  0.3912  0.3104  0.2381  0.1883  0.1378  0.0834  0.0263  -0.0351
> 0.47660 0.4624  0.3798  0.2972  0.2372  0.1772  0.1293  0.0814  0.0225
>
> The preamble and  splot call is contained in a gp script file like so:
> [plot-xy-surface.gp]
> #!/usr/bin/gnuplot -persist
> reset session
> set terminal wxt 1 persist enhanced
>
> X_min=-18.5; X_max=-13.5; Y_min=-18.5; Y_max=-13.5;
> Z_min=-0.6; Z_max=0.6
>
> unset xtics;
> set xrange [X_min:X_max]; set xtics X_min,0.5,X_max; set xlabel "X"
> unset ytics;
> set yrange [Y_min:Y_max]; set ytics Y_min,0.5,Y_max; set ylabel "Y"
> set zrange [Z_min:Z_max]; set ztics Z_min,0.1,Z_max; set zlabel "Z"
>
> unset key; set key outside
>
> set xyplane 0.0
> set grid; set cntrparam levels 13; set isosamples 100
> splot ....
>
> The terminal session is:
> gnuplot> call "plot-xy-surface.gp"
> gnuplot> show surface
>         surface is drawn
>
> I have tried many variations, and have now drawn a blank!  As mentioned
> above there is no surface, and the base plane is set at Z_min rather
> than 0.0 as requested!
>
> Is there any option that I should be turning on or indeed off?
>
> For reference:
> GNUPLOT:        gnuplot 5.4 patchlevel 4
> OS:             Debian 12  bookworm
> DESKTOP         Mate 1.26.0
>
> I have no problem using splot with functions.
>
> Any input much appreciated.
>
> --
> Geoff
>
>
>
> _______________________________________________
> gnuplot-info mailing list
> gnu...@li...
> Membership management via:
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>

[Gnuplot-info] SurfacePlotDataMatrixProducesAxesNoSurface

[Geoff K. <ge...@ka...>]

I am attempting to plot a surface from data in a file. The plot produced 
shows the correct X,Y, Z axes and key. But no surface and the base plane 
is not where I expect it to be.

For simplicity I am testing with the data inline using:
splot [X_min:X_max][Y_min:Y_max] '-' matrix
0.0046	-0.067	-0.1375	-0.2081	-0.2587	-0.3094	-0.3702	-0.4311	-0.495
0.097	0.026	-0.043	-0.1129	-0.1617	-0.2087	-0.2577	-0.3123 -0.3891
0.1774	0.0877	0.0226	-0.0425	-0.1011	-0.1598	-0.2069	-0.254	-0.3127
0.2578	0.1498	0.0882	0.0278	-0.0405	-0.1085	-0.1561	-0.1989	-0.2363
0.3034	0.2022	0.1448	0.0875	0.0233	-0.0408	-0.0947	-0.1486	-0.1892
0.3491	0.2587	0.2015	0.1438	0.0872	0.0285	-0.0333	-0.0951	-0.1421
0.4093	0.3214	0.256	0.1905	0.1377	0.085	0.0251	-0.0349	-0.0886
0.4695	0.3912	0.3104	0.2381	0.1883	0.1378	0.0834	0.0263	-0.0351
0.47660	0.4624	0.3798	0.2972	0.2372	0.1772	0.1293	0.0814	0.0225

The preamble and  splot call is contained in a gp script file like so:
[plot-xy-surface.gp]
#!/usr/bin/gnuplot -persist
reset session
set terminal wxt 1 persist enhanced

X_min=-18.5; X_max=-13.5; Y_min=-18.5; Y_max=-13.5;
Z_min=-0.6; Z_max=0.6

unset xtics;
set xrange [X_min:X_max]; set xtics X_min,0.5,X_max; set xlabel "X"
unset ytics;
set yrange [Y_min:Y_max]; set ytics Y_min,0.5,Y_max; set ylabel "Y"
set zrange [Z_min:Z_max]; set ztics Z_min,0.1,Z_max; set zlabel "Z"

unset key; set key outside

set xyplane 0.0
set grid; set cntrparam levels 13; set isosamples 100
splot ....

The terminal session is:
gnuplot> call "plot-xy-surface.gp"
gnuplot> show surface
	surface is drawn

I have tried many variations, and have now drawn a blank!  As mentioned 
above there is no surface, and the base plane is set at Z_min rather 
than 0.0 as requested!

Is there any option that I should be turning on or indeed off?

For reference:
GNUPLOT:	gnuplot 5.4 patchlevel 4
OS:		Debian 12  bookworm
DESKTOP		Mate 1.26.0

I have no problem using splot with functions.

Any input much appreciated.

-- 
Geoff

Re: [Gnuplot-info] real nos. with "D"exponent

[Ethan M. <eam...@gm...>]

Look in the documentation for the command "set datafile fortran"

The `set datafile fortran` command enables a special check for values in
the
input file expressed as Fortran D or Q constants. This extra check slows
down
the input process, and should only be selected if you do in fact have
datafiles
containing Fortran D or Q constants. The option can be disabled again using
`unset datafile fortran`.



On Wed, Aug 12, 2026 at 6:06 PM Al Conle <fa...@gm...> wrote:

> Hi Gnuplot,
>
> Minor problem while using gnuplot6.0.0
>
> I have a larger txt file of 10 data columns showing a problem and a
> file with a fix.
> Below is  a  "tail"  of both files :
> cat tailBad+Good.txt
> #==> badFile.txt <==
> -0.00064 -0.00890   -25.9  -878.3 -1729.7   599.0    1995   22013.
>  0.4542704D-04  0.9625114D-01
> -0.00065 -0.00890   -26.6  -877.8 -1730.0   598.8    1997   22070.
>  0.4531073D-04  0.9634200D-01
> -0.00065 -0.00890   -26.6  -878.0 -1730.0   598.6    1998   22101.
>  0.4524784D-04  0.9638724D-01
> -0.00065 -0.00890   -26.6  -877.7 -1730.0   598.5    1999   22134.
>  0.4517834D-04  0.9643242D-01
> -0.00065 -0.00889   -26.9  -877.7 -1728.4   598.5    2000   22134.
>  0.4517834D-04  0.9647760D-01
>
> #==> goodFile.txt <==
> -0.00064 -0.00890   -25.9  -878.8 -1729.7   599.2    1994   21957. 0.000046
> 0.096206
> -0.00064 -0.00890   -25.9  -878.3 -1729.7   599.0    1995   22013. 0.000045
> 0.096251
> -0.00065 -0.00890   -26.6  -877.8 -1730.0   598.8    1997   22070. 0.000045
> 0.096342
> -0.00065 -0.00890   -26.6  -878.0 -1730.0   598.6    1998   22101. 0.000045
> 0.096387
> -0.00065 -0.00890   -26.6  -877.7 -1730.0   598.5    1999   22134. 0.000045
> 0.096432
> -0.00065 -0.00889   -26.9  -877.7 -1728.4   598.5    2000   22134. 0.000045
> 0.096478
>
>
> When plotted with command:
>     plot "tailBad+Good.txt" u 7:10 w l
>
>
> the plot shows two lines.  It seems that the   *D-01"  exponent is not
> correctly interpreted.   If I change all the  "D"  to "E" and replot, the
> lines are on top of each other.
>
> I am downloading  and installing 6.5 tomorrow and will check if the
> problem is solved in that version.
>
> Thanks for creating a great Gnuplot !
> It is a wonderful, useful tool !
>
> Al Conle
>
> _______________________________________________
> gnuplot-info mailing list
> gnu...@li...
> Membership management via:
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>

[Gnuplot-info] real nos. with "D"exponent

[Al C. <fa...@gm...>]

Hi Gnuplot,

Minor problem while using gnuplot6.0.0

I have a larger txt file of 10 data columns showing a problem and a
file with a fix.
Below is  a  "tail"  of both files :
cat tailBad+Good.txt
#==> badFile.txt <==
-0.00064 -0.00890   -25.9  -878.3 -1729.7   599.0    1995   22013.
 0.4542704D-04  0.9625114D-01
-0.00065 -0.00890   -26.6  -877.8 -1730.0   598.8    1997   22070.
 0.4531073D-04  0.9634200D-01
-0.00065 -0.00890   -26.6  -878.0 -1730.0   598.6    1998   22101.
 0.4524784D-04  0.9638724D-01
-0.00065 -0.00890   -26.6  -877.7 -1730.0   598.5    1999   22134.
 0.4517834D-04  0.9643242D-01
-0.00065 -0.00889   -26.9  -877.7 -1728.4   598.5    2000   22134.
 0.4517834D-04  0.9647760D-01

#==> goodFile.txt <==
-0.00064 -0.00890   -25.9  -878.8 -1729.7   599.2    1994   21957. 0.000046
0.096206
-0.00064 -0.00890   -25.9  -878.3 -1729.7   599.0    1995   22013. 0.000045
0.096251
-0.00065 -0.00890   -26.6  -877.8 -1730.0   598.8    1997   22070. 0.000045
0.096342
-0.00065 -0.00890   -26.6  -878.0 -1730.0   598.6    1998   22101. 0.000045
0.096387
-0.00065 -0.00890   -26.6  -877.7 -1730.0   598.5    1999   22134. 0.000045
0.096432
-0.00065 -0.00889   -26.9  -877.7 -1728.4   598.5    2000   22134. 0.000045
0.096478


When plotted with command:
    plot "tailBad+Good.txt" u 7:10 w l


the plot shows two lines.  It seems that the   *D-01"  exponent is not
correctly interpreted.   If I change all the  "D"  to "E" and replot, the
lines are on top of each other.

I am downloading  and installing 6.5 tomorrow and will check if the
problem is solved in that version.

Thanks for creating a great Gnuplot !
It is a wonderful, useful tool !

Al Conle

Re: [Gnuplot-info] Graphing with GNUPlot with GTK4 UI Library

[Walter H. <wh...@bf...>]

I have seen this type of request the last years alot.
I never implemented it but you may like to try ...

People often forget that gnuplot can be used in a pipe. So you can write your programm
using pipe() and some defaults hardcoded in your programm. The result will be shown in a window controled by gnuplot.
If you need access to the window, you may try to open a shared memory (no idea if that can be done with GTK).

maybe that help some what
 CU


________________________________________
Von: monkeyking9872 <mon...@gm...>
Gesendet: Donnerstag, 2. Juli 2026 20:00:32
An: gnu...@li...
Betreff: [Gnuplot-info] Graphing with GNUPlot with GTK4 UI Library

Hi All,

This is my first time posting here, so my apologies if this has already
been discussed.

I was wondering if anyone has used the graphing/plotting abilities of
GNUPlot with the GTK4 UI library. In particular, I am writing my program in
C.

My first approach is going to be attempting to read in data in gnuplot from
the standard input (stdin), since I believe that is how data is being
re-directed to gnuplot in this example of live-plotting with GNUPlot:
http://hxcaine.com/blog/2013/02/28/running-gnuplot-as-a-live-graph-with-automatic-updates/

Let me know if there are cleaner methods anyone knows of.

Thank you,
MonkeyMan

_______________________________________________
gnuplot-info mailing list
gnu...@li...
Membership management via: https://lists.sourceforge.net/lists/listinfo/gnuplot-info

Re: [Gnuplot-info] gnuplot-info Digest, Vol 215, Issue 1

[Al C. <fa...@gm...>]

One way we solved this problem in a realtime test
was to write all the data to a file, and the using a
Linux  "tail"  command (in a script)  on that file,  grab the
latest data, and execute a gnuplot script,  whenever
we wanted a fresh plot.
 The linux script could loop with a timer I guess.



On Fri, Jul 3, 2026 at 8:34 AM <gnu...@li...>
wrote:

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>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of gnuplot-info digest..."
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>
> Today's Topics:
>
>    1. Graphing with GNUPlot with GTK4 UI Library (monkeyking9872)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 2 Jul 2026 13:00:32 -0500
> From: monkeyking9872 <mon...@gm...>
> To: gnu...@li...
> Subject: [Gnuplot-info] Graphing with GNUPlot with GTK4 UI Library
> Message-ID:
>         <
> CAO...@ma...>
> Content-Type: text/plain; charset="UTF-8"
>
> Hi All,
>
> This is my first time posting here, so my apologies if this has already
> been discussed.
>
> I was wondering if anyone has used the graphing/plotting abilities of
> GNUPlot with the GTK4 UI library. In particular, I am writing my program in
> C.
>
> My first approach is going to be attempting to read in data in gnuplot from
> the standard input (stdin), since I believe that is how data is being
> re-directed to gnuplot in this example of live-plotting with GNUPlot:
>
> http://hxcaine.com/blog/2013/02/28/running-gnuplot-as-a-live-graph-with-automatic-updates/
>
> Let me know if there are cleaner methods anyone knows of.
>
> Thank you,
> MonkeyMan
>
>
> ------------------------------
>
>
>
> ------------------------------
>
> Subject: Digest Footer
>
> _______________________________________________
> gnuplot-info mailing list
> gnu...@li...
> Membership management via:
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>
>
> ------------------------------
>
> End of gnuplot-info Digest, Vol 215, Issue 1
> ********************************************
>

[Gnuplot-info] Graphing with GNUPlot with GTK4 UI Library

[monkeyking9872 <mon...@gm...>]

Hi All,

This is my first time posting here, so my apologies if this has already
been discussed.

I was wondering if anyone has used the graphing/plotting abilities of
GNUPlot with the GTK4 UI library. In particular, I am writing my program in
C.

My first approach is going to be attempting to read in data in gnuplot from
the standard input (stdin), since I believe that is how data is being
re-directed to gnuplot in this example of live-plotting with GNUPlot:
http://hxcaine.com/blog/2013/02/28/running-gnuplot-as-a-live-graph-with-automatic-updates/

Let me know if there are cleaner methods anyone knows of.

Thank you,
MonkeyMan

Re: [Gnuplot-info] Changing the Z axis as displayed in splot

[Norwid B. <nb...@ya...>]

Hello Nicolas

In your instance, does it help if you switch the definition of the upper /
lower level of corresponding axis?

Your post does not provide (synthetic / anonymized) data to work with, nor the
script deployed.  This is the reason why I departed from one examples about the
sync(u,v) functions of the [demo page] (with the [complete script]).  Line 25
reading

```
set zrange [ -0.500000 : 1.00000 ] noreverse writeback
```

was replaced by

```
set zrange [ 1.0 : -0.5 ] noreverse writeback
```

To generate a permanent record (gnuplot 6.0 patchlevel 3 as packaged for Linux
Debian 14/forky), the first two lines of the script were decommented, too.  By
this, the cone now is a deep depression, the direction of the vertical axis is
inverted:

```
set terminal pngcairo  transparent enhanced font "arial,10" fontscale 1.0 size
600, 400 
set output 'surface1.16.png'
set dummy u, v
set label 1 "This is equal to 1" at -5.00000, -2.00000, 1.50000 center
norotate back nopoint
set arrow 1 from -5.00000, -2.10000, 1.40000 to 0.00000, 0.00000, 1.00000 head
back nofilled linewidth 1.000 dashtype solid
set view 70, 20, 1, 1
set samples 51, 51
set isosamples 21, 21
set style data lines
set ztics  norangelimit -1.00000,0.25 ,1.00000
set title "Sinc function" 
set trange [ * : * ] noreverse nowriteback
set urange [ * : * ] noreverse nowriteback
set vrange [ * : * ] noreverse nowriteback
set xlabel "X axis" 
set xlabel  offset character -3, -2, 0 font "" textcolor lt -1 norotate
set xrange [ -1.00000 : 1.00000 ] noreverse nowriteback
set x2range [ * : * ] noreverse writeback
set ylabel "Y axis" 
set ylabel  offset character 3, -2, 0 font "" textcolor lt -1 rotate
set yrange [ -1.00000 : 1.00000 ] noreverse nowriteback
set y2range [ * : * ] noreverse writeback
set zlabel "Z axis" 
set zlabel  offset character -5, 0, 0 font "" textcolor lt -1 norotate
# set zrange [ -0.500000 : 1.00000 ] noreverse writeback
set zrange [ 1.0 : -0.5 ] noreverse writeback  # line edited
set cbrange [ * : * ] noreverse writeback
set rrange [ * : * ] noreverse writeback
set colorbox vertical origin screen 0.9, 0.2 size screen 0.05, 0.6 front
noinvert bdefault
sinc(u,v) = sin(sqrt(u**2+v**2)) / sqrt(u**2+v**2)
VERSION = "gnuplot version 6.0.3"
NO_ANIMATION = 1
## Last datafile plotted: "$grid"
splot [-12:12.01] [-12:12.01] sinc(u,v)
```

Best regards,
Norwid

[demo page]: https://gnuplot.sourceforge.net/demo_6.0/surface1.html
[complete script]: https://gnuplot.sourceforge.net/demo_6.0/surface1.16.gnu

[Gnuplot-info] Changing the Z axis as displayed in splot

[Nicholas E. <nic...@gm...>]

I'm using windows + version 6 wgnuplot.exe. I have a 4D data file where 
-Z data is up and +Z data is down. Any combination of "set zrange [a:b] 
c" makes no difference whether a = +/- 2, b = -/+ 2, and c=reverse or 
(blank space), the Z axis always plots with -2 down and +2 up.  How to 
splot with the Z axis + numbers down and - numbers up?

[Gnuplot-info] Issue with Gnuplot TikZ terminal font sizes and alignment of tick labels

[Dmitry <unk...@gm...>]

Hi everyone,
I am trying to increase the font size in my plots so that they remain 
readable when combined into a multi-plot grid for an article.
Here is a minimal example of my Gnuplot script:

> set terminal tikz noclip tightboundingbox standalone size 8cm,11cm
> set output 'test.tex'
>
> set grid
> set xrange [0:10]
>
> set key outside right top horizontal Left reverse keywidth graph 1.0 
> samplen 1
> set tics font ",24"
> set xlabel font ",24\"
> set ylabel font ",124"
> plot \
>     cos(x) notitle lc rgb "red" dashtype 2 

The problem is that this script produces a plot with misaligned tick 
labels (please see the attachment). The numbers along both the X and Y 
axes are shifted upwards.
I managed to find a workaround online by changing the terminal settings:

> set terminal tikz noclip tightboundingbox standalone size 8cm,11cm 
> charsize 0.4,0.8 preamble '\tikzset{gp node right/.style={anchor=east, 
> align=right, font=\large, inner sep=0pt, outer sep=0pt}}' 
However, I have some concerns: is it possible that using a non-standard 
|charsize| and redefining the |\tikzset| style could break other 
elements of the plot, such as shifting error bars or other elements?

Thanks!

[Gnuplot-info] sample

[Alan <ala...@gm...>]

Despite some help at `sampling`, there is not a real Help entry for
`sample`, and perhaps as a result, I may be misusing it.

In a single chart, I want to plot a function (f) and an array (xs). I can

plot sample[i=1:10] '+' u (xs[i]):(xs[i+1]) w steps, [0:1.5] f(x)

But I want to plot the function first and then the array.
The following does not work (error: undefined variable: sample):

plot  [0:1.5] f(x), sample[i=1:10] '+' u (xs[i]):(xs[i+1]) w steps

How shd I reverse the order of the plots?

Thanks!
gnuplot 6.0 patchlevel 4

[Gnuplot-info] samplen oddity

[Alan <ala...@gm...>]

In gnuplot 6.0 patchlevel 4, I have to
    `set key samplen -1`
to suppress the sample. (Instead of 0.)
Is this expected behavior?

Thanks!

[Gnuplot-info] FYI: downsample SVG script

[Richard H. <rjh...@ya...>]

hi Folks,
I want to share Gnuplot SVG output - with hyperlinks. However, because the file is large it is difficult to share and slow to render. I wrote this script to rasterize and down-sample the non-hyperlink bits of the Gnuplot SVG but retain the hyperlinks (and text):
https://github.com/richardhenwood/downsample-gnuplot-svg
best regards,Richard

Re: [Gnuplot-info] Nonlinear color bar question

[Philipp K. J. <ph...@ja...>]

On Wed, 22 Apr 2026 14:43:17 +0000
Patrick Alken via gnuplot-info <gnu...@li...>
wrote:

For gradients:

set palette defined ( 0 "red", 0.1 "white", 1 "blue" )

For sharp transitions, double the position param:

set palette defined ( 0 "red", 0.1 "red", 0.1 "white", 0.2 "white", 0.2
"blue", 1 "blue" )

Either way:

plot "data" u 1:2:3 lc pal

Also check: 

test palette

Note: The positions w/in "set palette" are
relative, they do not (automatically) 
correspond to values from the plot range.

Also consider: 

set cbrange

Best,

		Ph.

> Hello,
> 
>   I am struggling to make a plot with a nonlinear color bar. I want
> the colors themselves to be nonlinear rather than the tic marks. My
> detailed question is here:
> 
> https://stackoverflow.com/questions/79929626/how-to-make-a-nonlinear-color-bar
> 
> Any help is appreciated,
> Patrick
> 
> _______________________________________________
> gnuplot-info mailing list
> gnu...@li...
> Membership management via:
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info



-- 

Philipp K. Janert
www.janert.me

Re: [Gnuplot-info] Nonlinear color bar question

[Patrick A. <pat...@co...>]

I don't understand how to do that. What I am looking for is a color bar similar to the "mag" palette from GMT:

https://docs.generic-mapping-tools.org/6.3/_images/GMT_App_M_1a.png
________________________________
From: DeForest, Craig E. <cra...@sw...>
Sent: Wednesday, April 22, 2026 10:46 AM
To: Patrick Alken <pat...@co...>; gnu...@li... <gnu...@li...>
Subject: Re: Nonlinear color bar question

[External email - use caution]

PDL::Gnuplot does this by generating an explicit color lookup table, from which gnuplot interpolates values.  You can always fall back on that brute-force approach.

Get Outlook for iOS<https://aka.ms/o0ukef>
________________________________
From: Patrick Alken via gnuplot-info <gnu...@li...>
Sent: Wednesday, April 22, 2026 8:43:17 AM
To: gnu...@li... <gnu...@li...>
Subject: [Gnuplot-info] Nonlinear color bar question

[EXTERNAL EMAIL]

Hello,

  I am struggling to make a plot with a nonlinear color bar. I want the colors themselves to be nonlinear rather than the tic marks. My detailed question is here:

https://stackoverflow.com/questions/79929626/how-to-make-a-nonlinear-color-bar

Any help is appreciated,
Patrick

_______________________________________________
gnuplot-info mailing list
gnu...@li...
Membership management via: https://lists.sourceforge.net/lists/listinfo/gnuplot-info

[Gnuplot-info] Nonlinear color bar question

[Patrick A. <pat...@co...>]

Hello,

  I am struggling to make a plot with a nonlinear color bar. I want the colors themselves to be nonlinear rather than the tic marks. My detailed question is here:

https://stackoverflow.com/questions/79929626/how-to-make-a-nonlinear-color-bar

Any help is appreciated,
Patrick

Re: [Gnuplot-info] Problems with long plot command (main)

[Hernán De A. <var...@gm...>]

Hi Ethan,

Thanks for the response. I will dig a bit more in this and see if the 
problem is as you suggest.

H.

Den 2026-04-13 kl. 06:35, skrev Ethan Merritt:
> I cannot reproduce this problem by cut-and-paste from the text in
> the previous message.  For me it succeeds using gnuplot executables with
> and without the previous fix.  I tested with executables as far back as 5.4.
>
> So I don't know what might be causing your problem.
> Is it possible there is some issue with whitespace or non-printing
> characters that did not survive being embedded in Email?
>
> 	Ethan
>
>> /H.
>>
>> Den 2026-04-12 kl. 15:12, skrev Hernán De Angelis:
>>> Hi
>>>
>>> We recently had some discussion on problems with long commands. If I
>>> understand correctly it had to do with cases where a file had no data
>>> and notitle was passed.
>>>
>>> I am now encountering a similar problem with a script that uses a long
>>> plot command. I use this script often and that never previously had
>>> issues with it. The script has a long plot command involving 52 small
>>> files (5 of which currently have no data points) to be plotted as
>>> boxes where all calls have the "notitle" tag (see below).
>>>
>>> The script works if no title tag is passed, but it will fail with the
>>> notitle tag (as below), or with some title (e.g. "title 'title'").
>>>
>>> It seems that the fix done recently may require a different approach
>>> but I am unsure what that may be. In my case I wish the "notitle" tag
>>> could be passed and understood by gnuplot as before.
>>>
>>> Any hint will be appreciated.
>>>
>>> Thanks
>>>
>>> Hernán
>>>
>>> PS: this occurs while using main branch
>>>
>>>
>>> gnuplot script:
>>>
>>> set terminal pngcairo enhanced size 960,640 font "DejaVu-Sans,9"
>>> set output 'file.png'
>>> set title 'my title' font "DejaVu-Sans-Bold,12"
>>> set key left
>>> set grid
>>> set xrange [0.5:52.5]
>>> set xtics 2
>>> set ylabel "qty"
>>> set style fill transparent solid 0.5
>>> plot  'foo-0.dat' u (0):1 w boxplot lw 2 notitle, 'foo-1.dat' u (1):1
>>> w boxplot lw 2 notitle, 'foo-2.dat' u (2):1 w boxplot lw 2 notitle,
>>> 'foo-3.dat' u (3):1 w boxplot lw 2 notitle, 'foo-4.dat' u (4):1 w
>>> boxplot lw 2 notitle, 'foo-5.dat' u (5):1 w boxplot lw 2 notitle,
>>> 'foo-6.dat' u (6):1 w boxplot lw 2 notitle, 'foo-7.dat' u (7):1 w
>>> boxplot lw 2 notitle, 'foo-8.dat' u (8):1 w boxplot lw 2 notitle,
>>> 'foo-9.dat' u (9):1 w boxplot lw 2 notitle, 'foo-10.dat' u (10):1 w
>>> boxplot lw 2 notitle, 'foo-11.dat' u (11):1 w boxplot lw 2 notitle,
>>> 'foo-12.dat' u (12):1 w boxplot lw 2 notitle, 'foo-13.dat' u (13):1 w
>>> boxplot lw 2 notitle, 'foo-14.dat' u (14):1 w boxplot lw 2 notitle,
>>> 'foo-15.dat' u (15):1 w boxplot lw 2 notitle, 'foo-16.dat' u (16):1 w
>>> boxplot lw 2 notitle, 'foo-17.dat' u (17):1 w boxplot lw 2 notitle,
>>> 'foo-18.dat' u (18):1 w boxplot lw 2 notitle, 'foo-19.dat' u (19):1 w
>>> boxplot lw 2 notitle, 'foo-20.dat' u (20):1 w boxplot lw 2 notitle,
>>> 'foo-21.dat' u (21):1 w boxplot lw 2 notitle, 'foo-22.dat' u (22):1 w
>>> boxplot lw 2 notitle, 'foo-23.dat' u (23):1 w boxplot lw 2 notitle,
>>> 'foo-24.dat' u (24):1 w boxplot lw 2 notitle, 'foo-25.dat' u (25):1 w
>>> boxplot lw 2 notitle, 'foo-26.dat' u (26):1 w boxplot lw 2 notitle,
>>> 'foo-27.dat' u (27):1 w boxplot lw 2 notitle, 'foo-28.dat' u (28):1 w
>>> boxplot lw 2 notitle, 'foo-29.dat' u (29):1 w boxplot lw 2 notitle,
>>> 'foo-30.dat' u (30):1 w boxplot lw 2 notitle, 'foo-31.dat' u (31):1 w
>>> boxplot lw 2 notitle, 'foo-32.dat' u (32):1 w boxplot lw 2 notitle,
>>> 'foo-33.dat' u (33):1 w boxplot lw 2 notitle, 'foo-34.dat' u (34):1 w
>>> boxplot lw 2 notitle, 'foo-35.dat' u (35):1 w boxplot lw 2 notitle,
>>> 'foo-36.dat' u (36):1 w boxplot lw 2 notitle, 'foo-37.dat' u (37):1 w
>>> boxplot lw 2 notitle, 'foo-38.dat' u (38):1 w boxplot lw 2 notitle,
>>> 'foo-39.dat' u (39):1 w boxplot lw 2 notitle, 'foo-40.dat' u (40):1 w
>>> boxplot lw 2 notitle, 'foo-41.dat' u (41):1 w boxplot lw 2 notitle,
>>> 'foo-42.dat' u (42):1 w boxplot lw 2 notitle, 'foo-43.dat' u (43):1 w
>>> boxplot lw 2 notitle, 'foo-44.dat' u (44):1 w boxplot lw 2 notitle,
>>> 'foo-45.dat' u (45):1 w boxplot lw 2 notitle, 'foo-46.dat' u (46):1 w
>>> boxplot lw 2 notitle, 'foo-47.dat' u (47):1 w boxplot lw 2 notitle,
>>> 'foo-48.dat' u (48):1 w boxplot lw 2 notitle, 'foo-49.dat' u (49):1 w
>>> boxplot lw 2 notitle, 'foo-50.dat' u (50):1 w boxplot lw 2 notitle,
>>> 'foo-51.dat' u (51):1 w boxplot lw 2 notitle, 'foo-52.dat' u (52):1 w
>>> boxplot lw 2 notitle,
>>>
>>>
>>>
>>> Stdout:
>>>
>>> "gnuplot.conf" line 11: invalid command
>>>
>>>
>> _______________________________________________
>> gnuplot-info mailing list
>> gnu...@li...
>> Membership management via:https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>>
>
>
>

Re: [Gnuplot-info] Problems with long plot command (main)

[Hernán De A. <var...@gm...>]

Hi Ethan,

Thanks for the response. I will dig a bit more in this and see if the 
problem is as you suggest.

Hernán

Den 2026-04-13 kl. 06:35, skrev Ethan Merritt:
> I cannot reproduce this problem by cut-and-paste from the text in
> the previous message.  For me it succeeds using gnuplot executables with
> and without the previous fix.  I tested with executables as far back as 5.4.
>
> So I don't know what might be causing your problem.
> Is it possible there is some issue with whitespace or non-printing
> characters that did not survive being embedded in Email?
>
> 	Ethan
>
>> /H.
>>
>> Den 2026-04-12 kl. 15:12, skrev Hernán De Angelis:
>>> Hi
>>>
>>> We recently had some discussion on problems with long commands. If I
>>> understand correctly it had to do with cases where a file had no data
>>> and notitle was passed.
>>>
>>> I am now encountering a similar problem with a script that uses a long
>>> plot command. I use this script often and that never previously had
>>> issues with it. The script has a long plot command involving 52 small
>>> files (5 of which currently have no data points) to be plotted as
>>> boxes where all calls have the "notitle" tag (see below).
>>>
>>> The script works if no title tag is passed, but it will fail with the
>>> notitle tag (as below), or with some title (e.g. "title 'title'").
>>>
>>> It seems that the fix done recently may require a different approach
>>> but I am unsure what that may be. In my case I wish the "notitle" tag
>>> could be passed and understood by gnuplot as before.
>>>
>>> Any hint will be appreciated.
>>>
>>> Thanks
>>>
>>> Hernán
>>>
>>> PS: this occurs while using main branch
>>>
>>>
>>> gnuplot script:
>>>
>>> set terminal pngcairo enhanced size 960,640 font "DejaVu-Sans,9"
>>> set output 'file.png'
>>> set title 'my title' font "DejaVu-Sans-Bold,12"
>>> set key left
>>> set grid
>>> set xrange [0.5:52.5]
>>> set xtics 2
>>> set ylabel "qty"
>>> set style fill transparent solid 0.5
>>> plot  'foo-0.dat' u (0):1 w boxplot lw 2 notitle, 'foo-1.dat' u (1):1
>>> w boxplot lw 2 notitle, 'foo-2.dat' u (2):1 w boxplot lw 2 notitle,
>>> 'foo-3.dat' u (3):1 w boxplot lw 2 notitle, 'foo-4.dat' u (4):1 w
>>> boxplot lw 2 notitle, 'foo-5.dat' u (5):1 w boxplot lw 2 notitle,
>>> 'foo-6.dat' u (6):1 w boxplot lw 2 notitle, 'foo-7.dat' u (7):1 w
>>> boxplot lw 2 notitle, 'foo-8.dat' u (8):1 w boxplot lw 2 notitle,
>>> 'foo-9.dat' u (9):1 w boxplot lw 2 notitle, 'foo-10.dat' u (10):1 w
>>> boxplot lw 2 notitle, 'foo-11.dat' u (11):1 w boxplot lw 2 notitle,
>>> 'foo-12.dat' u (12):1 w boxplot lw 2 notitle, 'foo-13.dat' u (13):1 w
>>> boxplot lw 2 notitle, 'foo-14.dat' u (14):1 w boxplot lw 2 notitle,
>>> 'foo-15.dat' u (15):1 w boxplot lw 2 notitle, 'foo-16.dat' u (16):1 w
>>> boxplot lw 2 notitle, 'foo-17.dat' u (17):1 w boxplot lw 2 notitle,
>>> 'foo-18.dat' u (18):1 w boxplot lw 2 notitle, 'foo-19.dat' u (19):1 w
>>> boxplot lw 2 notitle, 'foo-20.dat' u (20):1 w boxplot lw 2 notitle,
>>> 'foo-21.dat' u (21):1 w boxplot lw 2 notitle, 'foo-22.dat' u (22):1 w
>>> boxplot lw 2 notitle, 'foo-23.dat' u (23):1 w boxplot lw 2 notitle,
>>> 'foo-24.dat' u (24):1 w boxplot lw 2 notitle, 'foo-25.dat' u (25):1 w
>>> boxplot lw 2 notitle, 'foo-26.dat' u (26):1 w boxplot lw 2 notitle,
>>> 'foo-27.dat' u (27):1 w boxplot lw 2 notitle, 'foo-28.dat' u (28):1 w
>>> boxplot lw 2 notitle, 'foo-29.dat' u (29):1 w boxplot lw 2 notitle,
>>> 'foo-30.dat' u (30):1 w boxplot lw 2 notitle, 'foo-31.dat' u (31):1 w
>>> boxplot lw 2 notitle, 'foo-32.dat' u (32):1 w boxplot lw 2 notitle,
>>> 'foo-33.dat' u (33):1 w boxplot lw 2 notitle, 'foo-34.dat' u (34):1 w
>>> boxplot lw 2 notitle, 'foo-35.dat' u (35):1 w boxplot lw 2 notitle,
>>> 'foo-36.dat' u (36):1 w boxplot lw 2 notitle, 'foo-37.dat' u (37):1 w
>>> boxplot lw 2 notitle, 'foo-38.dat' u (38):1 w boxplot lw 2 notitle,
>>> 'foo-39.dat' u (39):1 w boxplot lw 2 notitle, 'foo-40.dat' u (40):1 w
>>> boxplot lw 2 notitle, 'foo-41.dat' u (41):1 w boxplot lw 2 notitle,
>>> 'foo-42.dat' u (42):1 w boxplot lw 2 notitle, 'foo-43.dat' u (43):1 w
>>> boxplot lw 2 notitle, 'foo-44.dat' u (44):1 w boxplot lw 2 notitle,
>>> 'foo-45.dat' u (45):1 w boxplot lw 2 notitle, 'foo-46.dat' u (46):1 w
>>> boxplot lw 2 notitle, 'foo-47.dat' u (47):1 w boxplot lw 2 notitle,
>>> 'foo-48.dat' u (48):1 w boxplot lw 2 notitle, 'foo-49.dat' u (49):1 w
>>> boxplot lw 2 notitle, 'foo-50.dat' u (50):1 w boxplot lw 2 notitle,
>>> 'foo-51.dat' u (51):1 w boxplot lw 2 notitle, 'foo-52.dat' u (52):1 w
>>> boxplot lw 2 notitle,
>>>
>>>
>>>
>>> Stdout:
>>>
>>> "gnuplot.conf" line 11: invalid command
>>>
>>>
>> _______________________________________________
>> gnuplot-info mailing list
>> gnu...@li...
>> Membership management via:https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>>
>
>
>

Re: [Gnuplot-info] Problems with long plot command (main)

[Ethan M. <eam...@gm...>]

I cannot reproduce this problem by cut-and-paste from the text in
the previous message.  For me it succeeds using gnuplot executables with
and without the previous fix.  I tested with executables as far back as 5.4.

So I don't know what might be causing your problem.
Is it possible there is some issue with whitespace or non-printing
characters that did not survive being embedded in Email?

	Ethan

> 
> /H.
> 
> Den 2026-04-12 kl. 15:12, skrev Hernán De Angelis:
> > Hi
> >
> > We recently had some discussion on problems with long commands. If I 
> > understand correctly it had to do with cases where a file had no data 
> > and notitle was passed.
> >
> > I am now encountering a similar problem with a script that uses a long 
> > plot command. I use this script often and that never previously had 
> > issues with it. The script has a long plot command involving 52 small 
> > files (5 of which currently have no data points) to be plotted as 
> > boxes where all calls have the "notitle" tag (see below).
> >
> > The script works if no title tag is passed, but it will fail with the 
> > notitle tag (as below), or with some title (e.g. "title 'title'").
> >
> > It seems that the fix done recently may require a different approach 
> > but I am unsure what that may be. In my case I wish the "notitle" tag 
> > could be passed and understood by gnuplot as before.
> >
> > Any hint will be appreciated.
> >
> > Thanks
> >
> > Hernán
> >
> > PS: this occurs while using main branch
> >
> >
> > gnuplot script:
> >
> > set terminal pngcairo enhanced size 960,640 font "DejaVu-Sans,9"
> > set output 'file.png'
> > set title 'my title' font "DejaVu-Sans-Bold,12"
> > set key left
> > set grid
> > set xrange [0.5:52.5]
> > set xtics 2
> > set ylabel "qty"
> > set style fill transparent solid 0.5
> > plot  'foo-0.dat' u (0):1 w boxplot lw 2 notitle, 'foo-1.dat' u (1):1 
> > w boxplot lw 2 notitle, 'foo-2.dat' u (2):1 w boxplot lw 2 notitle, 
> > 'foo-3.dat' u (3):1 w boxplot lw 2 notitle, 'foo-4.dat' u (4):1 w 
> > boxplot lw 2 notitle, 'foo-5.dat' u (5):1 w boxplot lw 2 notitle, 
> > 'foo-6.dat' u (6):1 w boxplot lw 2 notitle, 'foo-7.dat' u (7):1 w 
> > boxplot lw 2 notitle, 'foo-8.dat' u (8):1 w boxplot lw 2 notitle, 
> > 'foo-9.dat' u (9):1 w boxplot lw 2 notitle, 'foo-10.dat' u (10):1 w 
> > boxplot lw 2 notitle, 'foo-11.dat' u (11):1 w boxplot lw 2 notitle, 
> > 'foo-12.dat' u (12):1 w boxplot lw 2 notitle, 'foo-13.dat' u (13):1 w 
> > boxplot lw 2 notitle, 'foo-14.dat' u (14):1 w boxplot lw 2 notitle, 
> > 'foo-15.dat' u (15):1 w boxplot lw 2 notitle, 'foo-16.dat' u (16):1 w 
> > boxplot lw 2 notitle, 'foo-17.dat' u (17):1 w boxplot lw 2 notitle, 
> > 'foo-18.dat' u (18):1 w boxplot lw 2 notitle, 'foo-19.dat' u (19):1 w 
> > boxplot lw 2 notitle, 'foo-20.dat' u (20):1 w boxplot lw 2 notitle, 
> > 'foo-21.dat' u (21):1 w boxplot lw 2 notitle, 'foo-22.dat' u (22):1 w 
> > boxplot lw 2 notitle, 'foo-23.dat' u (23):1 w boxplot lw 2 notitle, 
> > 'foo-24.dat' u (24):1 w boxplot lw 2 notitle, 'foo-25.dat' u (25):1 w 
> > boxplot lw 2 notitle, 'foo-26.dat' u (26):1 w boxplot lw 2 notitle, 
> > 'foo-27.dat' u (27):1 w boxplot lw 2 notitle, 'foo-28.dat' u (28):1 w 
> > boxplot lw 2 notitle, 'foo-29.dat' u (29):1 w boxplot lw 2 notitle, 
> > 'foo-30.dat' u (30):1 w boxplot lw 2 notitle, 'foo-31.dat' u (31):1 w 
> > boxplot lw 2 notitle, 'foo-32.dat' u (32):1 w boxplot lw 2 notitle, 
> > 'foo-33.dat' u (33):1 w boxplot lw 2 notitle, 'foo-34.dat' u (34):1 w 
> > boxplot lw 2 notitle, 'foo-35.dat' u (35):1 w boxplot lw 2 notitle, 
> > 'foo-36.dat' u (36):1 w boxplot lw 2 notitle, 'foo-37.dat' u (37):1 w 
> > boxplot lw 2 notitle, 'foo-38.dat' u (38):1 w boxplot lw 2 notitle, 
> > 'foo-39.dat' u (39):1 w boxplot lw 2 notitle, 'foo-40.dat' u (40):1 w 
> > boxplot lw 2 notitle, 'foo-41.dat' u (41):1 w boxplot lw 2 notitle, 
> > 'foo-42.dat' u (42):1 w boxplot lw 2 notitle, 'foo-43.dat' u (43):1 w 
> > boxplot lw 2 notitle, 'foo-44.dat' u (44):1 w boxplot lw 2 notitle, 
> > 'foo-45.dat' u (45):1 w boxplot lw 2 notitle, 'foo-46.dat' u (46):1 w 
> > boxplot lw 2 notitle, 'foo-47.dat' u (47):1 w boxplot lw 2 notitle, 
> > 'foo-48.dat' u (48):1 w boxplot lw 2 notitle, 'foo-49.dat' u (49):1 w 
> > boxplot lw 2 notitle, 'foo-50.dat' u (50):1 w boxplot lw 2 notitle, 
> > 'foo-51.dat' u (51):1 w boxplot lw 2 notitle, 'foo-52.dat' u (52):1 w 
> > boxplot lw 2 notitle,
> >
> >
> >
> > Stdout:
> >
> > "gnuplot.conf" line 11: invalid command
> >
> >
> 
> _______________________________________________
> gnuplot-info mailing list
> gnu...@li...
> Membership management via: https://lists.sourceforge.net/lists/listinfo/gnuplot-info
> 

Re: [Gnuplot-info] Problems with long plot command (main)

[Hernán De A. <var...@gm...>]

Hi again

Just a not, as a work around for this particular case I used "unset key" 
for the entire plot. I still need to omit title tags to avoid fails.

/H.

Den 2026-04-12 kl. 15:12, skrev Hernán De Angelis:
> Hi
>
> We recently had some discussion on problems with long commands. If I 
> understand correctly it had to do with cases where a file had no data 
> and notitle was passed.
>
> I am now encountering a similar problem with a script that uses a long 
> plot command. I use this script often and that never previously had 
> issues with it. The script has a long plot command involving 52 small 
> files (5 of which currently have no data points) to be plotted as 
> boxes where all calls have the "notitle" tag (see below).
>
> The script works if no title tag is passed, but it will fail with the 
> notitle tag (as below), or with some title (e.g. "title 'title'").
>
> It seems that the fix done recently may require a different approach 
> but I am unsure what that may be. In my case I wish the "notitle" tag 
> could be passed and understood by gnuplot as before.
>
> Any hint will be appreciated.
>
> Thanks
>
> Hernán
>
> PS: this occurs while using main branch
>
>
> gnuplot script:
>
> set terminal pngcairo enhanced size 960,640 font "DejaVu-Sans,9"
> set output 'file.png'
> set title 'my title' font "DejaVu-Sans-Bold,12"
> set key left
> set grid
> set xrange [0.5:52.5]
> set xtics 2
> set ylabel "qty"
> set style fill transparent solid 0.5
> plot  'foo-0.dat' u (0):1 w boxplot lw 2 notitle, 'foo-1.dat' u (1):1 
> w boxplot lw 2 notitle, 'foo-2.dat' u (2):1 w boxplot lw 2 notitle, 
> 'foo-3.dat' u (3):1 w boxplot lw 2 notitle, 'foo-4.dat' u (4):1 w 
> boxplot lw 2 notitle, 'foo-5.dat' u (5):1 w boxplot lw 2 notitle, 
> 'foo-6.dat' u (6):1 w boxplot lw 2 notitle, 'foo-7.dat' u (7):1 w 
> boxplot lw 2 notitle, 'foo-8.dat' u (8):1 w boxplot lw 2 notitle, 
> 'foo-9.dat' u (9):1 w boxplot lw 2 notitle, 'foo-10.dat' u (10):1 w 
> boxplot lw 2 notitle, 'foo-11.dat' u (11):1 w boxplot lw 2 notitle, 
> 'foo-12.dat' u (12):1 w boxplot lw 2 notitle, 'foo-13.dat' u (13):1 w 
> boxplot lw 2 notitle, 'foo-14.dat' u (14):1 w boxplot lw 2 notitle, 
> 'foo-15.dat' u (15):1 w boxplot lw 2 notitle, 'foo-16.dat' u (16):1 w 
> boxplot lw 2 notitle, 'foo-17.dat' u (17):1 w boxplot lw 2 notitle, 
> 'foo-18.dat' u (18):1 w boxplot lw 2 notitle, 'foo-19.dat' u (19):1 w 
> boxplot lw 2 notitle, 'foo-20.dat' u (20):1 w boxplot lw 2 notitle, 
> 'foo-21.dat' u (21):1 w boxplot lw 2 notitle, 'foo-22.dat' u (22):1 w 
> boxplot lw 2 notitle, 'foo-23.dat' u (23):1 w boxplot lw 2 notitle, 
> 'foo-24.dat' u (24):1 w boxplot lw 2 notitle, 'foo-25.dat' u (25):1 w 
> boxplot lw 2 notitle, 'foo-26.dat' u (26):1 w boxplot lw 2 notitle, 
> 'foo-27.dat' u (27):1 w boxplot lw 2 notitle, 'foo-28.dat' u (28):1 w 
> boxplot lw 2 notitle, 'foo-29.dat' u (29):1 w boxplot lw 2 notitle, 
> 'foo-30.dat' u (30):1 w boxplot lw 2 notitle, 'foo-31.dat' u (31):1 w 
> boxplot lw 2 notitle, 'foo-32.dat' u (32):1 w boxplot lw 2 notitle, 
> 'foo-33.dat' u (33):1 w boxplot lw 2 notitle, 'foo-34.dat' u (34):1 w 
> boxplot lw 2 notitle, 'foo-35.dat' u (35):1 w boxplot lw 2 notitle, 
> 'foo-36.dat' u (36):1 w boxplot lw 2 notitle, 'foo-37.dat' u (37):1 w 
> boxplot lw 2 notitle, 'foo-38.dat' u (38):1 w boxplot lw 2 notitle, 
> 'foo-39.dat' u (39):1 w boxplot lw 2 notitle, 'foo-40.dat' u (40):1 w 
> boxplot lw 2 notitle, 'foo-41.dat' u (41):1 w boxplot lw 2 notitle, 
> 'foo-42.dat' u (42):1 w boxplot lw 2 notitle, 'foo-43.dat' u (43):1 w 
> boxplot lw 2 notitle, 'foo-44.dat' u (44):1 w boxplot lw 2 notitle, 
> 'foo-45.dat' u (45):1 w boxplot lw 2 notitle, 'foo-46.dat' u (46):1 w 
> boxplot lw 2 notitle, 'foo-47.dat' u (47):1 w boxplot lw 2 notitle, 
> 'foo-48.dat' u (48):1 w boxplot lw 2 notitle, 'foo-49.dat' u (49):1 w 
> boxplot lw 2 notitle, 'foo-50.dat' u (50):1 w boxplot lw 2 notitle, 
> 'foo-51.dat' u (51):1 w boxplot lw 2 notitle, 'foo-52.dat' u (52):1 w 
> boxplot lw 2 notitle,
>
>
>
> Stdout:
>
> "gnuplot.conf" line 11: invalid command
>
>

[Gnuplot-info] Problems with long plot command (main)

[Hernán De A. <var...@gm...>]

Hi

We recently had some discussion on problems with long commands. If I 
understand correctly it had to do with cases where a file had no data 
and notitle was passed.

I am now encountering a similar problem with a script that uses a long 
plot command. I use this script often and that never previously had 
issues with it. The script has a long plot command involving 52 small 
files (5 of which currently have no data points) to be plotted as boxes 
where all calls have the "notitle" tag (see below).

The script works if no title tag is passed, but it will fail with the 
notitle tag (as below), or with some title (e.g. "title 'title'").

It seems that the fix done recently may require a different approach but 
I am unsure what that may be. In my case I wish the "notitle" tag could 
be passed and understood by gnuplot as before.

Any hint will be appreciated.

Thanks

Hernán

PS: this occurs while using main branch


gnuplot script:

set terminal pngcairo enhanced size 960,640 font "DejaVu-Sans,9"
set output 'file.png'
set title 'my title' font "DejaVu-Sans-Bold,12"
set key left
set grid
set xrange [0.5:52.5]
set xtics 2
set ylabel "qty"
set style fill transparent solid 0.5
plot  'foo-0.dat' u (0):1 w boxplot lw 2 notitle, 'foo-1.dat' u (1):1 w 
boxplot lw 2 notitle, 'foo-2.dat' u (2):1 w boxplot lw 2 notitle, 
'foo-3.dat' u (3):1 w boxplot lw 2 notitle, 'foo-4.dat' u (4):1 w 
boxplot lw 2 notitle, 'foo-5.dat' u (5):1 w boxplot lw 2 notitle, 
'foo-6.dat' u (6):1 w boxplot lw 2 notitle, 'foo-7.dat' u (7):1 w 
boxplot lw 2 notitle, 'foo-8.dat' u (8):1 w boxplot lw 2 notitle, 
'foo-9.dat' u (9):1 w boxplot lw 2 notitle, 'foo-10.dat' u (10):1 w 
boxplot lw 2 notitle, 'foo-11.dat' u (11):1 w boxplot lw 2 notitle, 
'foo-12.dat' u (12):1 w boxplot lw 2 notitle, 'foo-13.dat' u (13):1 w 
boxplot lw 2 notitle, 'foo-14.dat' u (14):1 w boxplot lw 2 notitle, 
'foo-15.dat' u (15):1 w boxplot lw 2 notitle, 'foo-16.dat' u (16):1 w 
boxplot lw 2 notitle, 'foo-17.dat' u (17):1 w boxplot lw 2 notitle, 
'foo-18.dat' u (18):1 w boxplot lw 2 notitle, 'foo-19.dat' u (19):1 w 
boxplot lw 2 notitle, 'foo-20.dat' u (20):1 w boxplot lw 2 notitle, 
'foo-21.dat' u (21):1 w boxplot lw 2 notitle, 'foo-22.dat' u (22):1 w 
boxplot lw 2 notitle, 'foo-23.dat' u (23):1 w boxplot lw 2 notitle, 
'foo-24.dat' u (24):1 w boxplot lw 2 notitle, 'foo-25.dat' u (25):1 w 
boxplot lw 2 notitle, 'foo-26.dat' u (26):1 w boxplot lw 2 notitle, 
'foo-27.dat' u (27):1 w boxplot lw 2 notitle, 'foo-28.dat' u (28):1 w 
boxplot lw 2 notitle, 'foo-29.dat' u (29):1 w boxplot lw 2 notitle, 
'foo-30.dat' u (30):1 w boxplot lw 2 notitle, 'foo-31.dat' u (31):1 w 
boxplot lw 2 notitle, 'foo-32.dat' u (32):1 w boxplot lw 2 notitle, 
'foo-33.dat' u (33):1 w boxplot lw 2 notitle, 'foo-34.dat' u (34):1 w 
boxplot lw 2 notitle, 'foo-35.dat' u (35):1 w boxplot lw 2 notitle, 
'foo-36.dat' u (36):1 w boxplot lw 2 notitle, 'foo-37.dat' u (37):1 w 
boxplot lw 2 notitle, 'foo-38.dat' u (38):1 w boxplot lw 2 notitle, 
'foo-39.dat' u (39):1 w boxplot lw 2 notitle, 'foo-40.dat' u (40):1 w 
boxplot lw 2 notitle, 'foo-41.dat' u (41):1 w boxplot lw 2 notitle, 
'foo-42.dat' u (42):1 w boxplot lw 2 notitle, 'foo-43.dat' u (43):1 w 
boxplot lw 2 notitle, 'foo-44.dat' u (44):1 w boxplot lw 2 notitle, 
'foo-45.dat' u (45):1 w boxplot lw 2 notitle, 'foo-46.dat' u (46):1 w 
boxplot lw 2 notitle, 'foo-47.dat' u (47):1 w boxplot lw 2 notitle, 
'foo-48.dat' u (48):1 w boxplot lw 2 notitle, 'foo-49.dat' u (49):1 w 
boxplot lw 2 notitle, 'foo-50.dat' u (50):1 w boxplot lw 2 notitle, 
'foo-51.dat' u (51):1 w boxplot lw 2 notitle, 'foo-52.dat' u (52):1 w 
boxplot lw 2 notitle,



Stdout:

"gnuplot.conf" line 11: invalid command