gnuplot-info — For questions and discussion about gnuplot

Re: [Gnuplot-info] Unsuscribing from mailings

[Dave H. <da...@ho...>]

On Mon, 13 Apr 2015, Ludovic Giraud wrote:

> when i follow the links at the bottom of the mails to try and unsuscribe 
> At some stage à message says that à confirmation Mail has been sent 
> after clicking on unsuscribe However I dont receive that mail and keep 
> receiving. Please help!

I'd say to check your junk mail folder, in case it was filed as spam.  
Also, check your mail logs in case it was rejected.

-- 
Dave Horsfall DTM (VK2KFU)   "Those who don't understand security will suffer."
http://www.horsfall.org/spam.html (and check the home page whilst you're there)

Re: [Gnuplot-info] set palette maxcolors different behavior in 5.0?

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

> There was a change in handling "maxcolors", but the change came several
> years ago.  It is not connected to version 4 / version 5.
> I think the new behavior was first introduced in 4.4.3 (Mar 2011) and
> tweaked a bit in later versions.
>
> The change is that terminals with full RGB color support will always
> give you any explicitly requested color.  That is, "maxcolors" will
> determine how many subdivisions are made for an interpolated palette,
> e.g.
>      set palette defined (0 "red", 1 "blue") maxcolors 5
>      test palette
> But if you request, say, 20 explicit color ranges you will get all
> of them even though you said "maxcolors 5"

I don't understand the purpose of maxcolors then. As a user I want the 
ability to switch between a continuous or discrete palette, and I 
shouldn't need to condense my 256 color palette down to 8 colors myself 
in order to achieve this. It seems to me that should be the purpose of 
the maxcolors feature.

Since I manage to get my desired result in the 'x11' terminal I will 
continue using that. But it sounds like when I try to print to png or 
pdf, I may end up with a different plot.

Could I request that the maxcolors be changed to automatically define 
discrete color levels even if more colors are provided in the palette?

Re: [Gnuplot-info] Unsuscribing from mailings

[Ludovic G. <b00...@es...>]

Hi,

   when i follow the links at the bottom of the mails to try and unsuscribe
At some stage à message says that à confirmation Mail has been sent after
clicking on unsuscribe However I dont receive that mail and keep receiving.
Please help!

Le dimanche 12 avril 2015, Ludovic Giraud <b00...@es...> a écrit :

> Hi,
>   how do I unsuscribe from the mailing list?
>
>

Re: [Gnuplot-info] set palette maxcolors different behavior in 5.0?

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

On Sunday, 12 April 2015 10:18:02 PM Patrick Alken wrote:
> I am trying to use 'set palette maxcolors 5" with the "moreland.pal"
> palette file found at: http://www.gnuplotting.org/data/moreland.pal.
> 
> Using the script:
> ----
> set pm3d map
> load 'moreland.pal'
> set palette maxcolors 5
> splot x+y
> ----
> 
> In gnuplot 4.6, this makes a nice discrete-color plot as intended.
> However in v5.0 the plot has a continuum of colors regardless of the
> "maxcolors" setting.

There was a change in handling "maxcolors", but the change came several
years ago.  It is not connected to version 4 / version 5.
I think the new behavior was first introduced in 4.4.3 (Mar 2011) and
tweaked a bit in later versions.

The change is that terminals with full RGB color support will always
give you any explicitly requested color.  That is, "maxcolors" will 
determine how many subdivisions are made for an interpolated palette,
e.g.
    set palette defined (0 "red", 1 "blue") maxcolors 5
    test palette
But if you request, say, 20 explicit color ranges you will get all
of them even though you said "maxcolors 5"

> In 5.0, set palette maxcolors does work for the default palette, but not
> moreland. Is there a reason why this is disabled for moreland palette?

You provided a file containing 256 explicit colors, so that's what you got.

I'm not sure why you are seeing different behavior with the x11
terminal.  I wouldn't have expected that.

Gnuplot version 5 does contain a new palette option that is in somewhat
the same spirit as the Moreland schemes you refer to.
It is obtained by "set palette cubehelix"
See "help cubehelix"
Full paper here:

   D A Green (2011) http://arxiv.org/abs/1108.5083


	Ethan

Re: [Gnuplot-info] set palette maxcolors different behavior in 5.0?

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

Apparently the problem is with the default terminal 'qt' in 5.0. If I
change to:

set term x11

then the set palette maxcolors command works again.

On 04/12/2015 10:18 PM, Patrick Alken wrote:
> I am trying to use 'set palette maxcolors 5" with the "moreland.pal"
> palette file found at: http://www.gnuplotting.org/data/moreland.pal.
> 
> Using the script:
> ----
> set pm3d map
> load 'moreland.pal'
> set palette maxcolors 5
> splot x+y
> ----
> 
> In gnuplot 4.6, this makes a nice discrete-color plot as intended.
> However in v5.0 the plot has a continuum of colors regardless of the
> "maxcolors" setting.
> 
> In 5.0, set palette maxcolors does work for the default palette, but not
> moreland. Is there a reason why this is disabled for moreland palette?
> 
> ------------------------------------------------------------------------------
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[Gnuplot-info] set palette maxcolors different behavior in 5.0?

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

I am trying to use 'set palette maxcolors 5" with the "moreland.pal"
palette file found at: http://www.gnuplotting.org/data/moreland.pal.

Using the script:
----
set pm3d map
load 'moreland.pal'
set palette maxcolors 5
splot x+y
----

In gnuplot 4.6, this makes a nice discrete-color plot as intended.
However in v5.0 the plot has a continuum of colors regardless of the
"maxcolors" setting.

In 5.0, set palette maxcolors does work for the default palette, but not
moreland. Is there a reason why this is disabled for moreland palette?

[Gnuplot-info] Unsuscribing from mailings

[Ludovic G. <b00...@es...>]

Hi,
  how do I unsuscribe from the mailing list?

Re: [Gnuplot-info] plot with rgbimage without white border (png terminal)

[Felix B. <fel...@gm...>]

Thank you for your suggestions. As you say, the result looks different, but
still not correct.


On 7 April 2015 at 13:38, theozh <th...@gm...> wrote:

> set term pngcairo size 3,3
>
> Using the pngcairo terminal gives you somewhat different results, but
> still not the ouput you want... :-(
>
>
>
>
> ------------------------------------------------------------------------------
> BPM Camp - Free Virtual Workshop May 6th at 10am PDT/1PM EDT
> Develop your own process in accordance with the BPMN 2 standard
> Learn Process modeling best practices with Bonita BPM through live
> exercises
> http://www.bonitasoft.com/be-part-of-it/events/bpm-camp-virtual-
> event?utm_
> source=Sourceforge_BPM_Camp_5_6_15&utm_medium=email&utm_campaign=VA_SF
> _______________________________________________
> gnuplot-info mailing list
> gnu...@li...
> Membership management via:
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>

Re: [Gnuplot-info] exclude data points during fit

[Francois M. <ma...@lp...>]

Hi Sunil,

If you work on some kind of Unix system, you should be able to use:
<pre>
set grid
set xrange [0:150]
set yrange [0.5:1.5]

plot "a.data" title "All datapoints" with errorbars
pause -1 "Hit [Enter] to continue..."

# A dummy fit function:
a=0.15
b=0.8
phi=-2.5
w=0.07
f(x)=a*sin(w*x+phi) + b

set samples 2000
# Plot only "Good" datapoints from the data file (a.data):
plot "< awk '$3 < 0.1' a.data" title "Good datapoints" with errorbars, 
f(x) title "Guess"
pause -1 "Hit [Enter] to continue..."

# Fit only "Good" datapoints :
fit f(x) "< awk '$3 < 0.1' a.data" via a,b,phi,w

plot "< awk '$3 < 0.1' a.data" title "Good datapoints" with errorbars, 
f(x) title "Best fit"
pause -1 "Hit [Enter] to continue..."
</pre>

However, removing such datapoints with large errors should not change a 
lot the result
of the fit in term of the computing of best-fit parameters for your 
function because their
weight is rather tiny when computing the LS statistics.
A more serious point is that this procedure will arbitrarily change the 
number of degrees of freedom of the fit and thus the P-value associated 
to the fit (so the acceptance region for your hypothesis) will be biased 
wrt to the original dataset.
This kind of approach is generaly not fair unless you can justify why 
you remove
such points and not other ones.


HTH

Best regards

frc
-- 

Re: [Gnuplot-info] exclude data points during fit

[Sunil M. D. <sm...@gm...>]

Thanks you here what I implemented if the error is more than 10% .

fit [0.02:1.5] f(x) "input.data"  using ($1):($2)/($3):((sqrt($2)/($3) >
(0.10*($2)/($3)) ? 1/0 :1)) via a,b,c


Thank you
Best Regards
sunil




On Wed, Apr 8, 2015 at 5:24 PM, BBands <bb...@gm...> wrote:

> Some ideas here:
> http://stackoverflow.com/questions/8432233/gnuplot-removing-outliers-when-plotting-a-data-file
>
>     John
>
> On Wed, Apr 8, 2015 at 6:03 AM, Sunil M. Dogra <sm...@gm...> wrote:
>
>> Hi,
>>
>>  Is there a possible solution to exclude the set of random data points
>> during the fit which has large error.
>>  eg: the six point from the  following
>>
>> 15 0.670739          0.0320602
>> 25 0.759323          0.0789241
>> 35 0.852012          0.0623855
>> 45 0.843333          0.0691489
>> 55 1.003240          0.0539426
>> 65 0.797746          0.550898
>> 75 0.893178          0.0491163
>> 85 0.680285          0.0425497
>> 95 0.749071          0.063844
>> 105 0.658553        0.047025
>> 115 0.823671        0.0144364
>>
>
>

Re: [Gnuplot-info] exclude data points during fit

[BBands <bb...@gm...>]

Some ideas here:
http://stackoverflow.com/questions/8432233/gnuplot-removing-outliers-when-plotting-a-data-file

     John

On Wed, Apr 8, 2015 at 6:03 AM, Sunil M. Dogra <sm...@gm...> wrote:

> Hi,
>
>  Is there a possible solution to exclude the set of random data points
> during the fit which has large error.
>  eg: the six point from the  following
>
> 15 0.670739          0.0320602
> 25 0.759323          0.0789241
> 35 0.852012          0.0623855
> 45 0.843333          0.0691489
> 55 1.003240          0.0539426
> 65 0.797746          0.550898
> 75 0.893178          0.0491163
> 85 0.680285          0.0425497
> 95 0.749071          0.063844
> 105 0.658553        0.047025
> 115 0.823671        0.0144364
>

[Gnuplot-info] exclude data points during fit

[Sunil M. D. <sm...@gm...>]

Hi,

 Is there a possible solution to exclude the set of random data points
during the fit which has large error.
 eg: the six point from the  following

15 0.670739          0.0320602
25 0.759323          0.0789241
35 0.852012          0.0623855
45 0.843333          0.0691489
55 1.003240          0.0539426
65 0.797746          0.550898
75 0.893178          0.0491163
85 0.680285          0.0425497
95 0.749071          0.063844
105 0.658553        0.047025
115 0.823671        0.0144364

..............
.......  so on


Thank you
Best Regards
sunil

[Gnuplot-info] How to disable grid-data mode with splot ?

[Francois M. <ma...@lp...>]

Dear Gnuploters,

I use the splot command with some data file for 3D rendering
with "wire" mode (no surfaces, facets ad the like).
My datafiles provides collections of vertexes (polylines) representing
the edges of 3D solid shapes managed by some external library.
This is particularly useful to check/visualize if some virtual geometry 
setup
is correct, helping to detect solid overlap...

Unfortunately, the splot driver regularly and automatically switches to 
'grid data' mode, adding annoying segments to connect some vertexes 
where I do not want to use this "isolines"
features. Reading the doc explains why it works lie, this:
<cite from="Gnuplot documentation">
If all datablocks contain the same number of points,
gnuplot will draw cross-isolines between datablocks, connecting 
corresponding points.
</cite>

Example: here I want to draw 2 parallel vertical segments AB and CD:
<pre>
gnuplot> splot '-' with line
0 0 0 # vertex A
0 0 1 # vertex B

1 0 0 # vertex C
1 0 1 # vertex D

e
</pre>
As both datablocks have 2 lines, the 'grid data' is activated
and it plots a vertical square ABDC in place of my only 2 segments!

For now I was not able to find a way (through a special option or 
command) that
would inhibit this feature and I am forced to add arbitrary vertexes to 
break
the  'grid data' feature:
<pre>
gnuplot> splot '-' with line
0 0 0   # vertex A
0 0 0.5 # trick: vertex 0.5*(A+B) is an additional mid-point for the 
first segment
0 0 1   # vertex B

1 0 0 # vertex C
1 0 1 # vertex D

e
</pre>
this restores my "2 segments" plot because datablocks don't have the
same number of vertexes.

I'd like to know if there is some kind of "unset grid data" command
or "splot 'a.data' index 0 nogriddata with lines" option ti inhibit
this feature.
If not it would be very useful to have it in gnuplot.
I just want to plot a collection of simple polylines with arbitrary 
number of vertexes, no
emulated grid-ed surfaces.

Many thanks for any help or hint.

fm
-- 
François Mauger

Re: [Gnuplot-info] plot with rgbimage without white border (png terminal)

[theozh <th...@gm...>]

set term pngcairo size 3,3

Using the pngcairo terminal gives you somewhat different results, but
still not the ouput you want... :-(

Re: [Gnuplot-info] plot with rgbimage without white border (png terminal)

[theozh <th...@gm...>]

Does the following help?

unset xzeroaxis
unset yzeroaxis

[Gnuplot-info] plot with rgbimage without white border (png terminal)

[Felix B. <fel...@gm...>]

Hi,

there seems to be a bug in plotting data with rgbimage, at least using the
png terminal: The image is somehow shifted with respect to the canvas, such
that there is a white line at one border and lost pixel lines at the
opposing border. Please find some more details and discussion here:

http://stackoverflow.com/questions/29449675/gnuplot-plot-image-without-white-border

Any ideas how to fix this?

Re: [Gnuplot-info] log color bar: out of range data --> invisible

[theozh <th...@gm...>]

> 
> Actually, I now see it's the same mapping.  I had not realized that.
> Bug?  Feature?
> 

As a simple user I cannot tell whether this is a bug or a feature ;-).

> FWIW I found the specific bug that fails to color negative
> values as NaN (background) when the cb axis is in log mode.
> So that will be fixed in the next patchlevel release of version 5.
> 

Thanks a lot, Ethan, for fixing that in the next release.
The workaround works for the time being...

Theo.

Re: [Gnuplot-info] log color bar: out of range data --> invisible

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

On Friday, 03 April 2015 03:04:32 PM Ethan A Merritt wrote:
> On Friday, 03 April 2015 09:49:48 PM theozh wrote:
> > OK, thanks John and Ethan. This trick works.
> > 
> > plot "Matrix2.dat" matrix using 1:2:($3<0 ? NaN : $3) with image
> > 
> > > 
> > > "set logscale cb" has been buggy/inconsistent for a long time.
> > > Some fixes went into the code recently, but I am not convinced
> > > that it is working consistently even now.   I suggest that if
> > > possible you re-work your plot so that it does not require
> > > log-scaling on the colorbar.
> > > 
> > Good to know that "set logscale cb" is obviously still buggy...
> > 
> > I do not have a choice. I want to diplay currents which are ranging e.g.
> > from 1e-11 to 1e-6. How should I display this without logscale?
> 
> There's no problem with log-scaling the value being plotted,
> the issue is with the settings for the color bar itself.
> So...
> 
>    unset log cb
>    set cbrange [*:*] noextend
>    plot $DATA matrix using 1:2:(log($3)) with image
> 
> Of course this is a different mapping of z value -> color than before.

Actually, I now see it's the same mapping.  I had not realized that.
Bug?  Feature?


FWIW I found the specific bug that fails to color negative
values as NaN (background) when the cb axis is in log mode.
So that will be fixed in the next patchlevel release of version 5.


	Ethan

Re: [Gnuplot-info] log color bar: out of range data --> invisible

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

On Friday, 03 April 2015 09:49:48 PM theozh wrote:
> OK, thanks John and Ethan. This trick works.
> 
> plot "Matrix2.dat" matrix using 1:2:($3<0 ? NaN : $3) with image
> 
> > 
> > "set logscale cb" has been buggy/inconsistent for a long time.
> > Some fixes went into the code recently, but I am not convinced
> > that it is working consistently even now.   I suggest that if
> > possible you re-work your plot so that it does not require
> > log-scaling on the colorbar.
> > 
> Good to know that "set logscale cb" is obviously still buggy...
> 
> I do not have a choice. I want to diplay currents which are ranging e.g.
> from 1e-11 to 1e-6. How should I display this without logscale?

There's no problem with log-scaling the value being plotted,
the issue is with the settings for the color bar itself.
So...

   unset log cb
   set cbrange [*:*] noextend
   plot $DATA matrix using 1:2:(log($3)) with image

Of course this is a different mapping of z value -> color than before.
In principle you could also manually re-map the palette definition using
   set palette functions  R(gray), G(gray), B(gray)
[but I have not actually tested this]

	Ethan

Re: [Gnuplot-info] log color bar: out of range data --> invisible

[theozh <th...@gm...>]

OK, thanks John and Ethan. This trick works.

plot "Matrix2.dat" matrix using 1:2:($3<0 ? NaN : $3) with image

> 
> "set logscale cb" has been buggy/inconsistent for a long time.
> Some fixes went into the code recently, but I am not convinced
> that it is working consistently even now.   I suggest that if
> possible you re-work your plot so that it does not require
> log-scaling on the colorbar.
> 
Good to know that "set logscale cb" is obviously still buggy...

I do not have a choice. I want to diplay currents which are ranging e.g.
from 1e-11 to 1e-6. How should I display this without logscale?

[Gnuplot-info] Question on gnuplot 5.0

[Dr.-Ing. D. J. <die...@t-...>]

Dear listmembers,
just a question for the sake of consistency: wouldn't it make sense to specify 

set style colors <classic|default|podo>

rather than

set colorsequence <classic|default|podo>

just to be in sync with specifications like:
set style line, set style arrow, set style <whatsoever>?

Take care





Dieter Jurzitza

-- 
-----------------------------------------------------------

                               |
                                \
                 /\_/\           |
                | ~x~ |/-----\   /
                 \   /-       \_/
  ^^__   _        /  _  ____   /
 <°°__ \- \_/     |  |/    |  |
  ||  ||         _| _|    _| _|

if you really want to see the pictures above - use some font
with constant spacing like courier! :-)
-----------------------------------------------------------

Re: [Gnuplot-info] log color bar: out of range data --> invisible

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

On Fri, Apr 3, 2015 at 3:48 AM, theozh <th...@gm...> wrote:
>> Same way. http://gnuplot.sourceforge.net/docs_4.2/node333.html
>>
>> On Thu, Apr 2, 2015 at 2:19 AM, theozh <th...@gm...
>> <mailto:th...@gm...>> wrote:
>>
>>     That's ok for column data...
>>     But how do you do it with matrix data?
>
> This works if you have your matrix data in column form:
> x1 y1 z1
> x2 y2 z2
> x3 y2 z3
> x4 y4 z4
> ...
>
> But how do you do operation if you have it in matrix form?
> z11 z12 z13 z14
> z21 z22 z23 z24
> z31 z32 z33 z34
> z41 z42 z43 z44

plot $DATA matrix using 1:2:($3<0 ? NaN : $3) with image


> To illustrate the strange observation
>
> If you have a file "Matrix1.dat"
> 1       2       3       4
> 2       -3      4       5
> 3       4       -5      6
> 4       5       6       7
>
> set palette rgbformulae 7,5,15
> set logscale cb
> plot "Matrix1.dat" matrix with image

"set logscale cb" has been buggy/inconsistent for a long time.
Some fixes went into the code recently, but I am not convinced
that it is working consistently even now.   I suggest that if
possible you re-work your plot so that it does not require
log-scaling on the colorbar.

Note that the trick shown above (resetting negative values to NaN)
will cause the corresponding pixels of a "with image" plot to be
omitted altogether - that is, the background color will show
through.  This is unrelated to the min or max values on the
color bar.

FWIW, the following seems to give a correct plot in gnuplot 5
although I think the log scaling is not useful in this case:

~~~~~~
$DATA << EOD
1e-8    2e-8    3e-8    4e-8
2e-8    -3e-8   4e-8    5e-8
3e-8    4e-8    -5e-8   6e-8
4e-8    5e-8    6e-8    7e-8
EOD

set palette rgbformulae 7,5,15
set logscale cb
set cbrange [1e-8:1e-7]

plot $DATA matrix using 1:2:($3<0 ? NaN : $3) with image
~~~~~~

     Ethan






>
> The negative values will be displayed with the minimum color, i.e. black
>
>
> However, if you have a file "Matrix2.dat"
> 1e-8    2e-8    3e-8    4e-8
> 2e-8    -3e-8   4e-8    5e-8
> 3e-8    4e-8    -5e-8   6e-8
> 4e-8    5e-8    6e-8    7e-8
>
> set palette rgbformulae 7,5,15
> set logscale cb
> plot "Matrix1.dat" matrix with image
>
> The negative values will be displayed with the maximum color, i.e. yellow.
>
> What is the reasoning behind that?
>
>
>
> ------------------------------------------------------------------------------
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Re: [Gnuplot-info] log color bar: out of range data --> invisible

[theozh <th...@gm...>]

> Same way. http://gnuplot.sourceforge.net/docs_4.2/node333.html
>
> On Thu, Apr 2, 2015 at 2:19 AM, theozh <th...@gm...
> <mailto:th...@gm...>> wrote:
>
>     That's ok for column data...
>     But how do you do it with matrix data?

This works if you have your matrix data in column form:
x1 y1 z1
x2 y2 z2
x3 y2 z3
x4 y4 z4
...

But how do you do operation if you have it in matrix form?
z11 z12 z13 z14
z21 z22 z23 z24
z31 z32 z33 z34
z41 z42 z43 z44


To illustrate the strange observation

If you have a file "Matrix1.dat"
1	2	3	4
2	-3	4	5
3	4	-5	6
4	5	6	7

set palette rgbformulae 7,5,15
set logscale cb
plot "Matrix1.dat" matrix with image

The negative values will be displayed with the minimum color, i.e. black


However, if you have a file "Matrix2.dat"
1e-8	2e-8	3e-8	4e-8
2e-8	-3e-8	4e-8	5e-8
3e-8	4e-8	-5e-8	6e-8
4e-8	5e-8	6e-8	7e-8

set palette rgbformulae 7,5,15
set logscale cb
plot "Matrix1.dat" matrix with image

The negative values will be displayed with the maximum color, i.e. yellow.

What is the reasoning behind that?

Re: [Gnuplot-info] log color bar: out of range data --> invisible

[theozh <th...@gm...>]

That's ok for column data...
But how do you do it with matrix data?

Am 02.04.2015 um 00:38 schrieb BBands:
> Actually that should be:
> 
> plot "ColumnData.dat" u 1:($2 > 0 ? $2 : NaN)
> 
>     John
> 

Re: [Gnuplot-info] log color bar: out of range data --> invisible

[BBands <bb...@gm...>]

Actually that should be:

plot "ColumnData.dat" u 1:($2 > 0 ? $2 : NaN)

    John

On Wed, Apr 1, 2015 at 1:44 PM, BBands <bb...@gm...> wrote:

> The ternary operator is your friend.
>
> plot "ColumnData.dat" u 1:($2 < 0 ? NaN : $2)
>
>     John
>
>