gnuplot-info — For questions and discussion about gnuplot

Re: [Gnuplot-info] data processing

[Thomas S. <t.s...@fz...>]

you need gnuplot version >= 4.4

xmin = 999999.
ymin = 999999.
# plot something
set table
plot 'datafilename' using
(abs($1)<xmin?xmin=$1:0,$1):(abs($2)<ymin?ymin=$2:0,$2)
unset table
print xmin
print ymin


Robaeys Pieter wrote:
> 
> Hello,
> 
>  
> 
> I have a question about data processing. I have a lot of experimental data
> and I want to process them. One of the things I have to do is to obtain
> the
> roots (x=0 and y=0) of my data (without fitting them). So in other words,
> I
> have to obtain the y-value of the point that is closest to the x-axis, and
> the x-value of the point closest to the y-axis. Is this possible to do
> with
> gnuplot?
> 
>  
> 
> Greetings,
> 
>  
> 
> PR
> 
> ------------------------------------------------------------------------------
> This SF.Net email is sponsored by the Verizon Developer Community
> Take advantage of Verizon's best-in-class app development support
> A streamlined, 14 day to market process makes app distribution fast and
> easy
> Join now and get one step closer to millions of Verizon customers
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> _______________________________________________
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> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
> 
> 

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[Gnuplot-info] Exponential Function (Real Part)

[kenwey <ye...@ms...>]

Hi all,

does anyone know how to make a smooth surface makt it look likes
http://commons.wikimedia.org/wiki/File:Exponential_Function_(Real_Part).png?

I tried but the color boundary is not smooth, if set up the zrange between
-12 and 12, or -18 and 18
 
reset
set title "complex number = real(exp(x+y*{0,1}))"
set timefmt "%H:%M"
set style fill solid 1
set xrange [-3:3]
set yrange [-2.1*pi:2.1*pi]
set zrange [-20:20]
set ticslevel 0
set xlabel  "X"
set ylabel "Y"
set zlabel "Z"
set contour base
set cntrparam levels incr -10,2,10
set pm3d
set palette rgbformulae 25,3,9
set isosamples 40
set hidden3d;
show xzeroaxis
set xzeroaxis
unset hidden3d
replot
splot real(exp(x+y*{0,1})) with lines lc rgb variable linewidth 1




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[Gnuplot-info] data processing

[Robaeys P. <pie...@st...>]

Hello,

 

I have a question about data processing. I have a lot of experimental data
and I want to process them. One of the things I have to do is to obtain the
roots (x=0 and y=0) of my data (without fitting them). So in other words, I
have to obtain the y-value of the point that is closest to the x-axis, and
the x-value of the point closest to the y-axis. Is this possible to do with
gnuplot?

 

Greetings,

 

PR

Re: [Gnuplot-info] I want to print the name of each point

[Thomas S. <t.s...@fz...>]

have a look at the demo scripts, especially at the datastrings demo:
http://gnuplot.sourceforge.net/demo/datastrings.html


cioppy wrote:
> 
> Hello.
> I've just installed Gnuplot on linux.
> I have the following file plot.dat :
> 
> set xlabel "Prezzo"
> set ylabel "Funzionalità"
> set xrange [0:500]
> set yrange [0:300]
> set title "Grafico";
> 
> 299	275	Name1
> 329	30	Name2	
> 129	27	Name3
> 
> i plot writing in terminal : plot "./plot.dat" using 1:2 with points
> 
> BUT I want in the grafic, near each point, his name (Name1, Name2 and
> Name3).
> 
> How can I do this !
> 
> Thank you so much !
> 

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Re: [Gnuplot-info] data processing

[Robaeys P. <pie...@st...>]

 

Hello,

 

I have a question about data processing. I have a lot of experimental data
and I want to process them. One of the things I have to do is to obtain the
roots (x=0 and y=0) of my data (without fitting them). So in other words, I
have to obtain the x-value of the point that is closest to the x-axis, and
the y-value of the point closest to the y-axis. Is this possible to do with
gnuplot?

 

Greetings,

 

PR

[Gnuplot-info] variable line style

[Tamas H. <ho...@gm...>]

Is it possible to have variable line style, read from a file, similar to
variable colour?

Re: [Gnuplot-info] Line types

[Thomas S. <t.s...@fz...>]

vector graphics is best for this purpose, so you should use 'pdf'
- or 'postscript' if your gnuplot installation wasn't compiled with
the pdf libraries.

if the conversion from postscript to pdf results in quality loss, then
you should use another converter which translates the postscript
vector graphics commands to appropriate pdf commands
(or maybe use another pdf viewer).

when using the 'test' command output should go into a file
('set output <filename>') and not to the screen.


Wolfgang Pausch-2 wrote:
> 
> Hello,
> 
> probably a beginner question, but I wasn´t able to find an answer:
> 
> I have data points of three different measurements (i.e. three data files)
> and want to plot them using three lines.  Lines should be colored, but
> with different line types (e.g. dashed) in order to be able to distinguish
> them on a black-white-printer output.
> 
> I want to use the resulting picture in a latex document I generate using
> pdflatex.  Now, I wonder which terminal I should use.  I have tried:
> 
> png - I wasn´t able to generate dashed lines here, is it possible?
> postscript - basically it works, but I have to convert the resulting ps
> file, which seems to result in a visible loss of quality
> fig - fonts and lines just look awfully after exporting the fig file to
> some format pdflatex understands, to be honest...
> 
> What terminal type whould you use in that situation?  Is there anywhere a
> reference what the different terminals can do, especially how the line
> types assigned to the numbers actually look like?  The manual tells me I
> should use test for getting this information, however, this just prints a
> look sequence of rubbish to the screen.
> 
> Thanks for any help!
> 
> Wolfgang
> 
> ------------------------------------------------------------------------------
> This SF.Net email is sponsored by the Verizon Developer Community
> Take advantage of Verizon's best-in-class app development support
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> 

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[Gnuplot-info] Line types

[Wolfgang P. <wol...@ui...>]

Hello,

probably a beginner question, but I wasn´t able to find an answer:

I have data points of three different measurements (i.e. three data files) and want to plot them using three lines.  Lines should be colored, but with different line types (e.g. dashed) in order to be able to distinguish them on a black-white-printer output.

I want to use the resulting picture in a latex document I generate using pdflatex.  Now, I wonder which terminal I should use.  I have tried:

png - I wasn´t able to generate dashed lines here, is it possible?
postscript - basically it works, but I have to convert the resulting ps file, which seems to result in a visible loss of quality
fig - fonts and lines just look awfully after exporting the fig file to some format pdflatex understands, to be honest...

What terminal type whould you use in that situation?  Is there anywhere a reference what the different terminals can do, especially how the line types assigned to the numbers actually look like?  The manual tells me I should use test for getting this information, however, this just prints a look sequence of rubbish to the screen.

Thanks for any help!

Wolfgang

[Gnuplot-info] smooth and variable colour

[Tamas H. <ho...@gm...>]

I have a data file (foo.csv) consisting x,y coordinates, and colours defined
in hexadecimal

% plot 'foo.csv' using 1:2:3 with lines lc rgb variable linewidth 8 title
'foochart'

The above plots the data with perfect colouring.
However if I add smoothing (for example csplines, but happens with other
smoothing algorithms too)

% plot 'foo.csv' using 1:2:3 with lines lc rgb variable linewidth 8 title
'foochart' smooth csplines

I get short gradients of blue fading to black (if the associated y values
are above 0), and yellow fading to white (if the associated y values are
below 0).

Is there any way to correct this problem? (short of not using smoothing)
The problem occurs in both 4.4 rc1 and 4.5 csv.

Re: [Gnuplot-info] plot like Chess Board

[Thomas S. <t.s...@fz...>]

set xrange [-0.5:3.5]
set yrange [-0.5:3.5]
set view map
set palette maxcolors 2
set palette defined (0 "black", 1 "white")
splot "< awk -v RS=X '{if (FNR>1) for (i=2;i<=NF;i++) printf(\" %d\",\$i) ;
print \"\"}' filename.dat" matrix with image


arvindmer wrote:
> 
> Hello to all & New Year Wishes.
> I have data file like this
> #	A	B	C	DX1	1	0	1	0X2	0	1	0	1X3	1	0	1	0X4	0	1	0	1X5	1	0	1	0 
> 
> & I want to plot it like the Chess Board i.e.  black box for 1 and white
> for 0 .Any idea how to do this ?????
> 
> Regard,Arvind
> 
> 
> 
>       
> ------------------------------------------------------------------------------
> This SF.Net email is sponsored by the Verizon Developer Community
> Take advantage of Verizon's best-in-class app development support
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> easy
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[Gnuplot-info] plot like Chess Board

[arvin m. <arv...@ya...>]

Hello to all & New Year Wishes.
I have data file like this
#	A	B	C	DX1	1	0	1	0X2	0	1	0	1X3	1	0	1	0X4	0	1	0	1X5	1	0	1	0 

& I want to plot it like the Chess Board i.e.  black box for 1 and white for 0 .Any idea how to do this ?????

Regard,Arvind



      

[Gnuplot-info] to plot a .wav file in C

[Anish A. <ani...@re...>]

sir

i hav a C program to read a .wav file and compiled with gcc.i need to plot the sample values in C.

cud u please help me...........

Re: [Gnuplot-info] Polar Plot with logarithmic magnitude

[Thomas S. <t.s...@fz...>]

apply the log10() function to your data and shift the resulting r range
to positive values (starting from zero).
an example:

# rrange goes from 10^-4 = 0.0001 to 10^0 = 1.
# so log10(rrange) goes from -4 to 0 and must be
# shifted to 0 to 4
reset
set angles radians
set grid polar pi/6.
unset label
set label 1 "0.0001" at 0, -0.2
set label 2 "0.001" at 1, -0.2
set label 3 "0.01" at 2, -0.2
set label 4 "0.1" at 3, -0.2
set label 5 "1.0" at 4, -0.2
unset arrow
set arrow 1 from 0,0 to 4,0 nohead
set polar
set samples 1000, 1000
set size square
set rrange [0:4]
set xrange [-4:4]
set yrange [-4:4]
# some function producing values in the range
# 0.0001 to (nearly) 1.0
f(t)=0.99*(sin(t+0.5*pi)**2+10**(-4))
# plot the function (multiplied by 4. to have the same range)
plot f(t)*4.
# plot log10() of the function (shifted by 4.)
replot log10(f(t))+4.
pause -1
# and now without border
unset border
set format x ""
set format y ""
set xtics scale 0
set ytics scale 0
replot


Christian Winkel-2 wrote:
> 
> Hi
> 
> I have to plot a lot of polar plots with a logarithmic r scale.
> 
> It should look like this:
> 
> http://img39.imageshack.us/img39/5214/polarmie.png
> 
> This plot is made by gnumeric, but it is too time-consuming and didn't
> look good in a latex document.
> 
> Is it possibe to plot someting like this with gnuoplot? How?
> 
> 
> 
> 
> Thank you
> 
> 
> Chris
> 
> 
> ------------------------------------------------------------------------------
> This SF.Net email is sponsored by the Verizon Developer Community
> Take advantage of Verizon's best-in-class app development support
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> easy
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> 
> 

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[Gnuplot-info] Polar Plot with logarithmic magnitude

[Christian W. <ma...@ch...>]

Hi

I have to plot a lot of polar plots with a logarithmic r scale.

It should look like this:

http://img39.imageshack.us/img39/5214/polarmie.png

This plot is made by gnumeric, but it is too time-consuming and didn't
look good in a latex document.

Is it possibe to plot someting like this with gnuoplot? How?




Thank you


Chris

[Gnuplot-info] (no subject)

[Christian W. <ma...@ch...>]

[Gnuplot-info] polar plot with logarithmic scale magnitude

[Christian W. <gma...@ch...>]

Hi

I need to plot a lot of plots like : 

http://www.postimage.org/image.php?v=gx1eC3sr 

This plot is made with gnumeric, but it is very time-consuming to make it and it
don't look really good in ab lates dokument. This is why I want to plot it in
gnuplot. But days of googleing didn't show me how.

Is this possible in gnuplot? If yes how?

I know how to plot a polar plot but I can't get the log scale!



Thank you


Chris

[Gnuplot-info] how to plot CFD contour data of unstructured mesh with lines

[killtimm <ti...@16...>]

I have a 2D unstructured mesh datafile which has the following format (for
each cell, x1, x2 and x3 are different, so are with y values ):

x1 y1 Mach1
x2 y2 Mach2
#blank                                            (for cell 1)
x3 y3 Mach3
x3 y3 Mach3
#blank 
#blank
x1 y1 Mach1
x2 y2 Mach2
#blank                                             (for cell 2)
x3 y3 Mach3
x3 y3 Mach3
#blank
#blank 

...... ......                                          (for cell N)

It's ok that a colored contour map could be made with pm3d
But I want to plot a contour with just isolines like below:
http://old.nabble.com/file/p26932610/Ma_1part.jpg 

I tried to do it using dgrid3d, but it will be impossible if the mesh is
very large to consume too much memory for interpolation calculating. 
And the result is often far from satisfactory.

Anxious for your answers.  Thanks in advance

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Re: [Gnuplot-info] Omit missing x-values

[Thomas S. <t.s...@fz...>]

plot 'datafilename' using 0:2:xticlabels(1) with linespoints


Til Schubbe-2 wrote:
> 
> I have data like this:
> 
> 1 2
> 2 5
> 3 4
> 5 1
> 6 3
> 7 4
> 9 5
> 
> How can I plot these data with monotonic ranges on the x-axis? I'd
> like to get something like this:
> 
> 5 X    X
> 4  X  X
> 3    X
> 2X
> 1   X
>  1235679
> 
> The FAQ's par. 4.14 (specifying '?') doesn't apply here, because
> this requires a pseudo-datum to be present in the source data.
> 
> Regards
> Til
> 
> ------------------------------------------------------------------------------
> This SF.Net email is sponsored by the Verizon Developer Community
> Take advantage of Verizon's best-in-class app development support
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> easy
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> 

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[Gnuplot-info] Omit missing x-values

[Til S. <li...@li...>]

I have data like this:

1 2
2 5
3 4
5 1
6 3
7 4
9 5

How can I plot these data with monotonic ranges on the x-axis? I'd
like to get something like this:

5 X    X
4  X  X
3    X
2X
1   X
 1235679

The FAQ's par. 4.14 (specifying '?') doesn't apply here, because
this requires a pseudo-datum to be present in the source data.

Regards
Til

Re: [Gnuplot-info] How to extract the data from splot in gnuplot

[Thomas S. <t.s...@fz...>]

have a look at 'set table':
http://www.gnuplot.info/docs/node267.html


sabari wrote:
> 
> I used some fitting function to plot the 2D plot (splot <fn.>). Then i got
> nice 2D contour plot.. Now my question is, 
> how to extract data from fitting function or gnuplot like x,y,z (.dat
> format or .txt format)
> 
> or
> 
> how to plot projection of 2D contour plot.
> 
> 
> If possible pls send some idea!!!!
> 

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Re: [Gnuplot-info] command line arguments to gnuplot scripts

[seb_kramm <seb...@ya...>]

LukasP a écrit :
> Let's have system command:
> wgnuplot.exe tab2png.gp test.tab

I'm not sure what you want exactly, I guess it is a generated line from somewhere else.
If you can remove the .exe in the calling line, then just create a simple 
wgnuplot.bat, that is given priority over the .exe by the OS
It will just contain these lines:

dowhatyouwant.exe %1 %2
wgnuplot.exe %1 %2

with "dowhatyouwant.exe" ( or .bat) being the app that will fetch the arguments
Of course, beware of spaces (or use quotes)

[Gnuplot-info] How to extract the data from splot in gnuplot

[sabari <sa...@gm...>]

I used some fitting function to plot the 2D plot (splot <fn.>). Then i got
nice 2D contour plot.. Now my question is, 
how to extract data from fitting function or gnuplot like x,y,z (.dat format
or .txt format)

or

how to plot projection of 2D contour plot.


If possible pls send some idea!!!!
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Re: [Gnuplot-info] command line arguments to gnuplot scripts

[Tatsuro M. <tma...@ya...>]

Hans Wrote
**********
If_ you use 
the wgnuplot_pipes.exe or the (soon to become available) gnuplot.exe 
console version, that is.
**********
You should use wgnuplot_pipes.exe but not wgnuplot.exe if you would  like to use gnuplot 4.2.6 as Hans
wrote.

You can also use gnuplot.exe in  gnuplot 4.4rc1 or 4.5 (cvs).

windows version gnuplot 4.4rc1 is available at
http://sourceforge.net/projects/gnuplot/files/ 

I am distributing   gnuplot 4.4rc1 or 4.5 (cvs) at

http://www.tatsuromatsuoka.com/gnuplot/Eng/winbin/

Regards

Tatsuro
--- LukasP <LP...@po...> wrote:

> 
> ... OK, thank you for the explanation.
> 
> I didn't realize that all gnuplot parameters are treated as file names.
> Sorry.
> 
> 
> Hans-Bernhard Br将モker-2 wrote:
> > 
> > You don't, because you can't pass them.  gnuplot treats all command line 
> > arguments as file names or options, but not as parameters.
> > 
> > set FILE=system("echo %FILE%")
> > 
> 
> I tried to get environment variable as suggested, but I was not successful,
> see the output:
> 
> Terminal type set to 'windows'
> gnuplot> FILE=system("echo %HOME%")
>          warning: system evaluation not supported by MS-Windows 32 bit
> 
> So how to get it? Note that the "HOME" variable was set to "C:\Lukas" via
> system command:
> 
> set HOME=C:\Lukas
> 
> (Hope there won't be any problems using "\" in file names, although the "/"
> is used at Linux systems and "\" is often the escape-sequence prefix.)
> 
> Thank you in advance.
> 
> Lukas
> 
> NB:
> 
>         G N U P L O T
>         Version 4.2 patchlevel 6
>         last modified Sep 2009
>         System: MS-Windows 32 bit
> 
>         Copyright (C) 1986 - 1993, 1998, 2004, 2007 - 2009
>         Thomas Williams, Colin Kelley and many others                           
> 
> -- 
> View this message in context:
> http://old.nabble.com/command-line-arguments-to-gnuplot-scripts-tp7757834p26871956.html
> Sent from the Gnuplot - User mailing list archive at Nabble.com.
> 
> 
> ------------------------------------------------------------------------------
> This SF.Net email is sponsored by the Verizon Developer Community
> Take advantage of Verizon's best-in-class app development support
> A streamlined, 14 day to market process makes app distribution fast and easy
> Join now and get one step closer to millions of Verizon customers
> http://p.sf.net/sfu/verizon-dev2dev 
> _______________________________________________
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Re: [Gnuplot-info] command line arguments to gnuplot scripts

[LukasP <LP...@po...>]

... OK, thank you for the explanation.

I didn't realize that all gnuplot parameters are treated as file names.
Sorry.


Hans-Bernhard Bröker-2 wrote:
> 
> You don't, because you can't pass them.  gnuplot treats all command line 
> arguments as file names or options, but not as parameters.
> 
> set FILE=system("echo %FILE%")
> 

I tried to get environment variable as suggested, but I was not successful,
see the output:

Terminal type set to 'windows'
gnuplot> FILE=system("echo %HOME%")
         warning: system evaluation not supported by MS-Windows 32 bit

So how to get it? Note that the "HOME" variable was set to "C:\Lukas" via
system command:

set HOME=C:\Lukas

(Hope there won't be any problems using "\" in file names, although the "/"
is used at Linux systems and "\" is often the escape-sequence prefix.)

Thank you in advance.

Lukas

NB:

        G N U P L O T
        Version 4.2 patchlevel 6
        last modified Sep 2009
        System: MS-Windows 32 bit

        Copyright (C) 1986 - 1993, 1998, 2004, 2007 - 2009
        Thomas Williams, Colin Kelley and many others                           

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Re: [Gnuplot-info] command line arguments to gnuplot scripts

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

LukasP wrote:

> I have the same problem - 

The same as --- which one?

> how to access parameters passed on the system command line.

You don't, because you can't pass them.  gnuplot treats all command line 
arguments as file names or options, but not as parameters.

> I am a Windows user, so solutions described above are unreachable for me.

Again: what "above" are you referring to?

> Do you think it would be possible or useful to implement built-in variables
> (e.g. ARG1, ... ARG9) which would represent the command line arguments for
> [w]gnuplot?

No.  Because all such arguments already are script filenames.  A single 
argument can't be two different things at once.

> Or to create a built-in function e.g. getenv(varname) which would get the
> environment variable? 

Not need to.  Piping the 'echo' command already does that.  _If_ you use 
the wgnuplot_pipes.exe or the (soon to become available) gnuplot.exe 
console version, that is.

> set FILE getenv("FILE")

set FILE=system("echo %FILE%")