gnuplot-info — For questions and discussion about gnuplot

Re: [Gnuplot-info] Both positive and negative log y axis in same plot

[<l_b...@us...>]

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   Date: Thu, 24 Jan 2013 07:46:43 -0800
   From: somesh <som...@gm...>
   Content-Type: text/plain; charset="us-ascii"

   Hi,

   I have a data file like this:
   #x  y
   1   34
   2   450
   3   -987
   4   20045
   5   -1003
   6   -30

   For only positive values, just "logscale y" is fine. 
   For only negative values, I can use a reversed logscale:
   --
   set logscale y
   set yrange [ymin:ymax] reverse
   plot file  u 1:(-$2) axis x1y1 t "Y" w linespoints
   --

   But how do I plot both positive and negative values in same plot? 
   I want to place the x axis at the center of y axis; positive log scale (for
   positive values) above the x axis, and reversed logscale (for negative
   values) below the x axis.

How about

f(x) = (x >= 0 ? x : 1/abs(x));

plot file using 1:(f($2)) ....


Leo

[Gnuplot-info] Both positive and negative log y axis in same plot

[somesh <som...@gm...>]

Hi,

I have a data file like this:
#x  y
1   34
2   450
3   -987
4   20045
5   -1003
6   -30

For only positive values, just "logscale y" is fine. 
For only negative values, I can use a reversed logscale:
--
set logscale y
set yrange [ymin:ymax] reverse
plot file  u 1:(-$2) axis x1y1 t "Y" w linespoints
--

But how do I plot both positive and negative values in same plot? 
I want to place the x axis at the center of y axis; positive log scale (for
positive values) above the x axis, and reversed logscale (for negative
values) below the x axis.

Is it possible?

Thanks,
Somesh



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Re: [Gnuplot-info] png & other terminals missing

[nf <nic...@ub...>]

Thanks a bunch for the info. Apparently, all I had to do is install cairo and
that gave me both the pngcairo and pdfcairo terminals after recompiling the
gnuplot code.

Much appreciated,
Nick



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[Gnuplot-info] Histogram shadows

[Gerhard G. <gap...@gm...>]

Hi,

I'm  trying to create nice looking benchmarks with gnuplot which works quite 
well so far. See attachment.

What is still is missing is histogram shadows.
I've seen several examples in the internet which draw curve shadows by simple 
drawing the curve two times with a slight offset.

Is there a trick like this for histograms?

regards,
Gerhard

[Gnuplot-info] Showing data points with cspline

[ianstern <ian...@ao...>]

Hello,
I have several data sets that I want to display on a plot with varying
colored csplines. I want to display the the raw data points on the splines
and have the colors of the data points match that of the associated spline.
I also would like the key to display the line color and point shape together
for each data set. 

The closest I have come is plotting the data points with key titles and
overlaying the splines. However, to get the colors to match, I need to
specify the colors of each point and each spline, which is very time
consuming with all the data I have. Also, the line does not appear in the
key. 

Does anyone know a "clean" way to integrate the points into a cspline
display?

Thank you,
Ian



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Re: [Gnuplot-info] Plotting partial file based on 3rd column

[Kai H. <kai...@gm...>]

On 21 January 2013 16:53, walter harms <wh...@bf...> wrote:
> maybe it is a bit late but you can use awk etc also within a plot cmd like
> plot "<awk 'file'"
> i found it very handy while testing

I was using a similar approach
https://github.com/kaihendry/laptemp/commit/863ea1de75b95ac0db19f656c5178e569a296cfd

Problem with this is that lines won't join IIRC.

Re: [Gnuplot-info] Plotting partial file based on 3rd column

[walter h. <wh...@bf...>]

Am 16.01.2013 14:16, schrieb Thor Andreassen:
> On Wed, Jan 16, 2013 at 12:39:36PM +0100, Mikhail Kononets wrote:
>> you could use external data processing in this case, like:
>>
>> echo "plot \"< awk '{ if (\$3==\\\"A\\\") print}' data\" u 1:2 w l" | gnuplot --persist
> 
> Right, this is another way to do it, thank you. Although I would prefer,
> and expect, that the script I listed would work.
> 
> Thank you for your help.
> 
> [...]
> 
maybe it is a bit late but you can use awk etc also within a plot cmd like
plot "<awk 'file'"

i found it very handy while testing

re,
 wh

[Gnuplot-info] png & other terminals missing

[Nicola F. <fa...@ma...>]

Hi there,

I've been using gnuplot 4.6 for a while in my Ubuntu Linux 12.04 
installation and just noticed that the png, pngcairo and a host of other 
terminals are missing.

Any help on how to remedy that would be greatly appreciated.

Thanks very much,
Nick

Re: [Gnuplot-info] Plotting partial file based on 3rd column

[Kai H. <kai...@gm...>]

On 16 January 2013 18:50, Mikhail Kononets <mko...@gm...> wrote:
> why not using 1/0 specification instead of '?':

Sorry, I'm a bit of a gnuplot newbie.  I asked the question upon
http://stackoverflow.com/questions/14314895/ and my sources are upon
https://github.com/kaihendry/laptemp

gnuplot> help 1/0
Sorry, no help for '1/0'
gnuplot> help ?


Doesn't "1/0" mean one divided by zero?


I also (erroneously, I guess) filed a bug upon
http://sourceforge.net/tracker/?func=detail&aid=3600871&group_id=2055&atid=102055
which I've since closed.


Many thanks,

Re: [Gnuplot-info] Plotting partial file based on 3rd column

[Thor A. <ta...@to...>]

On Wed, Jan 16, 2013 at 12:39:36PM +0100, Mikhail Kononets wrote:
> you could use external data processing in this case, like:
> 
> echo "plot \"< awk '{ if (\$3==\\\"A\\\") print}' data\" u 1:2 w l" | gnuplot --persist

Right, this is another way to do it, thank you. Although I would prefer,
and expect, that the script I listed would work.

Thank you for your help.

[...]

-- 
best regards
Thor Andreassen

Re: [Gnuplot-info] Plotting partial file based on 3rd column

[Mikhail K. <mko...@gm...>]

you could use external data processing in this case, like:

echo "plot \"< awk '{ if (\$3==\\\"A\\\") print}' data\" u 1:2 w l" | 
gnuplot --persist

it is possible to avoid ugly escaping by putting the processing commands 
into a separate shell script.

On 16/01/2013 12:16, Thor Andreassen wrote:
> The only issue is if I want to connect data points
> separated by one of the undefined lines, see for example:
>
> echo "plot 'data' u 1:((strcol(3) eq 'A')? \$2 : 1/0)" | gnuplot
>
> [...]
>

-- 
Mikhail Kononets
Ph.D. Student
Marine Chemistry
Department of Chemistry and Molecular Biology
University of Gothenburg
Kemivagen 10
SE-412 96
Gothenburg, Sweden
office num.: +46-31-786-9063
mobile num.: +46-70-216-0936
e-mail: m.k...@ch...
         mko...@gm...

Re: [Gnuplot-info] Plotting partial file based on 3rd column

[Thor A. <ta...@to...>]

On Wed, Jan 16, 2013 at 11:50:20AM +0100, Mikhail Kononets wrote:
> Hi Thor
 
Hi Mikhail, thanks for the help.

> why not using 1/0 specification instead of '?':
> 
> echo "set table; plot 'data' u 1:((strcol(3) eq 'B')? \$2 : 1/0)" | gnuplot
> 
> # Curve 0 of 1, 5 points
> # Curve title: "'data' u 1:((strcol(3) eq 'B')? $2 : 1/0)"
> # x y type
>  0  0  u
>  0  0  u
>  1  1  i
>  2  4  i
>  0  0  u

I see, it does work better with NaNs, returning undefined for
non-matching lines.  The only issue is if I want to connect data points
separated by one of the undefined lines, see for example:

echo "plot 'data' u 1:((strcol(3) eq 'A')? \$2 : 1/0)" | gnuplot

[...]

-- 
best regards
Thor Andreassen

Re: [Gnuplot-info] Plotting partial file based on 3rd column

[Mikhail K. <mko...@gm...>]

Hi Thor

why not using 1/0 specification instead of '?':

echo "set table; plot 'data' u 1:((strcol(3) eq 'B')? \$2 : 1/0)" | gnuplot

# Curve 0 of 1, 5 points
# Curve title: "'data' u 1:((strcol(3) eq 'B')? $2 : 1/0)"
# x y type
  0  0  u
  0  0  u
  1  1  i
  2  4  i
  0  0  u

Mikhail

On 16/01/2013 10:53, Thor Andreassen wrote:
> Hi,
>
> I was under the impression that it is possible to plot only parts of a data
> file with the ternary operator (?:), strcol() and missing ('?'), but I get
> strange results.
>
> My data file contains:
>
> 8<------8<------8<------8<------
> cat<<  EOF>  data
> 1 2 A
> 2 3 A
> 1 1 B
> 2 4 B
> 3 2 A
> 4 3 A
> EOF
> 8<------8<------8<------8<------
>
> Now if try to plot the lines with 'B' in the third column:
>
> echo "set table; plot 'data' u 1:((strcol(3) eq 'B')? \$2 : '?')" | gnuplot
>
> The result is:
>
> 8<------8<------8<------8<------
> # Curve 0 of 1, 6 points
> # Curve title: "'data' u 1:((strcol(3) eq 'B')? $2 : '?')"
> # x y type
>   1  1.89869e-267  i
>   2  1.89869e-267  i
>   1  1  i
>   2  4  i
>   3  4  i
>   4  4  i
> 8<------8<------8<------8<------
>
> Which is not what I expected. Am I doing it wrong or is this a bug?
>
> The above was tested with a recent cvs version of Gnuplot.
>
> gnuplot>  show version long
>
>    G N U P L O T
>    Version 4.7 patchlevel 0    last modified 2013-01-08
>    Build System: Linux i686
>
>    Copyright (C) 1986-1993, 1998, 2004, 2007-2012
>    Thomas Williams, Colin Kelley and many others
>
>    gnuplot home:     http://www.gnuplot.info
>    mailing list:     gnu...@li...
>    faq, bugs, etc:   type "help FAQ"
>    immediate help:   type "help"  (plot window: hit 'h')
> Compile options:
> -READLINE  +LIBREADLINE  +HISTORY
> -BACKWARDS_COMPATIBILITY  +BINARY_DATA
> +GD_PNG  +GD_JPEG  +GD_TTF  +GD_GIF  +ANIMATION
> -USE_CWDRC  +X11  +X11_POLYGON  +MULTIBYTE  +X11_EXTERNAL +USE_MOUSE  +HIDDEN3D_QUADTREE
> +DATASTRINGS  +HISTOGRAMS  +OBJECTS  +STRINGVARS  +MACROS  +IMAGE  +USER_LINETYPES +STATS
>
> GNUPLOT_DRIVER_DIR = "/opt/stow/gnuplot/libexec/gnuplot/4.7"
> GNUPLOT_PS_DIR     = "/opt/stow/gnuplot/share/gnuplot/4.7/PostScript"
> HELPFILE           = "/opt/stow/gnuplot/share/gnuplot/4.7/gnuplot.gih"
>

-- 
Mikhail Kononets
Ph.D. Student
Marine Chemistry
Department of Chemistry and Molecular Biology
University of Gothenburg
Kemivagen 10
SE-412 96
Gothenburg, Sweden
office num.: +46-31-786-9063
mobile num.: +46-70-216-0936
e-mail: m.k...@ch...
         mko...@gm...

[Gnuplot-info] Plotting partial file based on 3rd column

[Thor A. <ta...@to...>]

Hi,

I was under the impression that it is possible to plot only parts of a data
file with the ternary operator (?:), strcol() and missing ('?'), but I get
strange results.

My data file contains:

8<------8<------8<------8<------
cat << EOF > data
1 2 A
2 3 A
1 1 B
2 4 B
3 2 A
4 3 A
EOF
8<------8<------8<------8<------

Now if try to plot the lines with 'B' in the third column:

echo "set table; plot 'data' u 1:((strcol(3) eq 'B')? \$2 : '?')" | gnuplot 

The result is:

8<------8<------8<------8<------
# Curve 0 of 1, 6 points
# Curve title: "'data' u 1:((strcol(3) eq 'B')? $2 : '?')"
# x y type
 1  1.89869e-267  i
 2  1.89869e-267  i
 1  1  i
 2  4  i
 3  4  i
 4  4  i
8<------8<------8<------8<------

Which is not what I expected. Am I doing it wrong or is this a bug?

The above was tested with a recent cvs version of Gnuplot.

gnuplot> show version long

  G N U P L O T
  Version 4.7 patchlevel 0    last modified 2013-01-08 
  Build System: Linux i686

  Copyright (C) 1986-1993, 1998, 2004, 2007-2012
  Thomas Williams, Colin Kelley and many others

  gnuplot home:     http://www.gnuplot.info
  mailing list:     gnu...@li...
  faq, bugs, etc:   type "help FAQ"
  immediate help:   type "help"  (plot window: hit 'h')
Compile options:
-READLINE  +LIBREADLINE  +HISTORY  
-BACKWARDS_COMPATIBILITY  +BINARY_DATA  
+GD_PNG  +GD_JPEG  +GD_TTF  +GD_GIF  +ANIMATION  
-USE_CWDRC  +X11  +X11_POLYGON  +MULTIBYTE  +X11_EXTERNAL +USE_MOUSE  +HIDDEN3D_QUADTREE  
+DATASTRINGS  +HISTOGRAMS  +OBJECTS  +STRINGVARS  +MACROS  +IMAGE  +USER_LINETYPES +STATS 

GNUPLOT_DRIVER_DIR = "/opt/stow/gnuplot/libexec/gnuplot/4.7"
GNUPLOT_PS_DIR     = "/opt/stow/gnuplot/share/gnuplot/4.7/PostScript"
HELPFILE           = "/opt/stow/gnuplot/share/gnuplot/4.7/gnuplot.gih"

-- 
best regards
Thor Andreassen

[Gnuplot-info] Manual key labels

[Nunzio L. <nun...@gm...>]

Hi all,

I would like to manually alter my plot's legend as in the example you can
find here:

http://tinypic.com/r/v66610/6

The line samples are automatically placed by the "set key" command, with a
blank title in the plot command (i.e.: "title ' ' ").
All the rest is placed manually by me as labels.

Obviously this is not an ideal way to do it as, for instance, everything
gets messed if I change the label font or the key spacing.

Do you have any suggestion to place those labels around the key fairly and
(almost) automatically?

I also thought I could build the entire key manually but cannot find a
command to simply display a line+point sample at some location.


Thanks in advance for your help!

NL

[Gnuplot-info] Coloured lines

[Kai H. <kai...@gm...>]

Do you know how I make the third column of
http://r2d2.webconverger.org/2012-12-27/temp.csv

awk '{print $3}' temp.csv  | sort -u
3.0.57-1-lts
3.6.10-1-ARCH
3.6.11-1-ARCH
3.8.1-1-mainline-dirty


Coloured keys in my gnuplot?
https://github.com/kaihendry/laptemp/blob/master/temp.gnu

Since I'm testing various kernels, a random colour is fine.

Any other tips to make the SVG output better, I would be grateful.

Many thanks,

-gnuplot 4.6 patchlevel 1 newbie

[Gnuplot-info] color scheme of gnuplot.info

[Grégoire G. <gre...@ep...>]

Dear all,

I like a lot the color scheme of gnuplot.info (eg in
http://gnuplot.sourceforge.net/demo/contours.html). I would like to know if
anyone of you know how to get it instead of the traditional red/green/blue.

Thanks a lot

Regards from Switzerland

[Gnuplot-info] Gnuplot change my font from Cron -

[Leopoldo A. <l.a...@gm...>]

I have a problem, gnuplot changing font type.

If I run it manually from terminal mode (manually), establishing full 
path in the same header gnuplot script ->
/set term png crop 2024.2024 font size 
'/usr/share/fonts/truetype/liberation/LiberationSans-Bold.ttf' 10/

Runs well.

Now, if I run it from CRON (automatically), so ->
* / 3 **** /bin/bash/ home/mm5/send_ftp/mapas/script/ejecutar.sh

Change the letter (type and size) and puts one for default.

Summerhot.

Re: [Gnuplot-info] "Soft" reset of plot options?

[Hans-Bernhard B. <HBB...@t-...>]

On 22.12.2012 18:57, Craig DeForest wrote:

> The "reset" command clears all that, but
> seems to cause problems for multiplot mode (e.g. by screwing up the
> automatic layout).

This effect may have to be considered a bug in "reset".
Is there an in-between command that clears all
> the labels, tics, markup, etc. without botching multiplots?

In a word: no.

There are medium-width reset commands like "unset arrow", however, which 
will undo all "set arrow" commands without a need to know which arrows 
you have set.

Re: [Gnuplot-info] failed to plot function

[lan1967 <la...@ma...>]

thanks it helped



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Re: [Gnuplot-info] failed to plot function

[Jefferson S. E. P. <st...@gm...>]

The important point seems to be making sure a floating point operation
is performed:

gnuplot> print 3/2
1
gnuplot> print 3./2
1.5

So I think f(x) should be defined as:

f(x)=3*x**2/((1.5-x)**2*(x+3))*exp(-(1./(1-2./3*x)+4./3*log(x+3)+5./3*log(abs(3./2-x))-3*log(3)-1+5./3*log(2))/6)

Cheers,
Stafusa


On Wed, Dec 26, 2012 at 4:37 AM, t t <la...@ma...> wrote:
>  Dear gnuplot users,
> I want to plot one function
> set terminal postscript eps enhanced
> set output "distr.eps"
> set xrange [0:1]
> set key above
> f(x)=3*x**2/((1.5-x)**2*(x+3))*exp(-(1/(1-2/3*x)+4/3*log(x+3)+5/3*log(abs(3/2-x))-3*log(3)-1+5/3*log(2))/6)
> plot f(1)*x
>
>
> and it says:
> all points y value undefined!
> What's wrong with my function?
> f(1) is a real number about 2.7
> Thank you for your attention
> gnuplot 4.6 patchlevel 1
> --
>
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[Gnuplot-info] failed to plot function

[t t <la...@ma...>]

 Dear gnuplot users, 
I want to plot one function 
set terminal postscript eps enhanced 
set output "distr.eps" 
set xrange [0:1]   
set key above 
f(x)=3*x**2/((1.5-x)**2*(x+3))*exp(-(1/(1-2/3*x)+4/3*log(x+3)+5/3*log(abs(3/2-x))-3*log(3)-1+5/3*log(2))/6) 
plot f(1)*x 


and it says: 
all points y value undefined! 
What's wrong with my function? 
f(1) is a real number about 2.7 
Thank you for your attention 
gnuplot 4.6 patchlevel 1
-- 

[Gnuplot-info] "Soft" reset of plot options?

[Craig D. <def...@bo...>]

There are a lot of options that persist between plots, so that (e.g.) if I place some markup on a plot with "set arrow...", it will appear on all subsequent plots.  The "reset" command clears all that, but seems to cause problems for multiplot mode (e.g. by screwing up the automatic layout).  Is there an in-between command that clears all the labels, tics, markup, etc. without botching multiplots?
Or is it necessary to actually track which plot parameters have been set, and unset them in between plots if I don't want the options to persist?

[Gnuplot-info] unsubscribe

[Childress, D. - N. D. M. <Dan...@mo...>]

unsubscribe

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Dexter MLRA Project Office
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Office: 573 624-5939 ext 145
Fax: 573 624-7509

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[Gnuplot-info] png as a backgroung image

[Ethy H. B. <eth...@in...>]

Hi all

I am sploting some 3D data and trying to use a png file as a backgroung 
image (w/alpha channel). The image is a grayed black and white version of some colored drawing.

The problem is if I first splot the bg image and then the data, the image
is plotted as if it was not grayed. All gray tones are "converted" to
black (rgb=#000000) and the mess is obvious.

I used:
splot   './data.txt' using 2:3:4:5 with linespoints lc rgb variable lw 2 pt 6 ,\
        './some_file.png' binary filetype=png dy=0.00000485 \
         dx=0.00000565 origin=(-45.66515,-22.77950,-99) with rgbalpha

If I first plot the data point and then the image, it appear grayed as it
should be *BUT* it is overwriting/erasing some points/lines where they "coexist"
and this is not desirable.

I used:
splot	'./some_file.png' binary filetype=png dy=0.00000485 \
        dx=0.00000565 origin=(-45.66515,-22.77950,-99) with rgbalpha , \
	'./data.txt' using 2:3:4:5 with linespoints lc rgb variable lw 2 pt 6

How can I solve this? Is it possible to make the background image stay in the
background?

Note: zdata ranges from -89 to -30
Note 2: view is set to "0,0,1,1"

Gnuplot is  4.4 patchlevel 3 (Ubuntu 12.04)
Tried with 4.6.1 patchlevel 0 (downloaded and compiled) with same results.

Regards

Ethy