gnuplot development

On 26.05.2012 13:39, Frank Stähr wrote:
> Hello, everybody!
>
> I am writing a C# program, that uses gnuplot via piping. See a minimal
> example in the attachment. (You probably have to fit the gnuplot path to
> your installation or use an environment variable just like me.)

No attachment --- might have been stripped by the mailing list processor.

> – Windows Visual C# 2010 (other compilers are not an option and I didn’t
> try others yet)
> – .Net-Framework 4.0 (same problem with 3.5 and probably others)
>
> This problem does not occur under linux.

I do wonder: since you are considering other platforms than MS, why on 
earth would you be programming in C#?

Hi and sorry for my late answer.

Am Sonntag, den 27.05.2012, 15:07 +0200 schrieb Hans-Bernhard Bröker: 
> No attachment --- might have been stripped by the mailing list processor.

Yes! At least I didn’t forget it. This mail should have an attachment,
but for sure here’s the source code:
==========
using System.Diagnostics;
using System.IO;

class Program
{
static void Main(string[] args)
{
ProcessStartInfo processStartInfo =
new ProcessStartInfo(@"gnuplot");
//new ProcessStartInfo(@"C:\Programme\gp460win32\binary\gnuplot.exe");
processStartInfo.UseShellExecute = false;
processStartInfo.RedirectStandardInput = true;

Process gpProc = new Process();
gpProc.StartInfo = processStartInfo;
gpProc.Start();
StreamWriter gpcommands = gpProc.StandardInput;
gpcommands.WriteLine("splot x+y");
gpcommands.WriteLine("bind Close \"exit gnuplot\"");
//gpcommands.WriteLine("exit");
gpProc.WaitForExit();
}
}
========

> > – Windows Visual C# 2010 (other compilers are not an option and I didn’t
> > try others yet)

Now I know that the Mono compiler has the same problem.

> > – .Net-Framework 4.0 (same problem with 3.5 and probably others)
> >
> > This problem does not occur under linux.
> 
> I do wonder: since you are considering other platforms than MS, why on 
> earth would you be programming in C#?

The thing with linux is just a hint for you. I have to work under MS at
work. And in this special case, I also do not have the choice to use
another language than C#.

On 29.05.2012 16:56, Frank Stähr wrote:

> Am Sonntag, den 27.05.2012, 15:07 +0200 schrieb Hans-Bernhard Bröker:
>> No attachment --- might have been stripped by the mailing list processor.
>
> Yes! At least I didn’t forget it. This mail should have an attachment,

Nope.  Odds are our Mailman is configured to reject attachments to this 
list.

[...]
> gpcommands.WriteLine("splot x+y");
> gpcommands.WriteLine("bind Close \"exit gnuplot\"");

I'll venture a wild guess here: you might fare better with these two 
lines in the opposite order.  Generally speaking, it's usually best for 
the plot or splot command, if there's only one, to be the last in any 
script.

so you want the xtic labels, but don't want the label values to be
plotted?

try this:

fprintf(pipe, "plot 'data.d' using 2:xtic(1) t col, '' u 3 ti col, '' u 4 ti
col\n");


rihii wrote:
> 
> yes, i already did that, but then xtics dont have the names that i need,
> respectively the ones thet are written in my data file... 
> 
> 
> Thomas Sefzick wrote:
>> 
>> you are requesting xtics explicitly:
>> 
>> fprintf(pipe, "plot 'data.d' using 1:xtic(1) t col, '' u 2 ti col, '' u 3
>> ti col, '' u 4 ti col\n");
>> 
>> remove "xtic(1)" from the "plot" command and there should be no xtics
>> anymore.
>> 
>> 
>> rihii wrote:
>>> 
>>> Hello everyone, i have read many threads in forums, but havent found my
>>> answer yet.
>>> 
>>> The problem is that GNUPLOT is plotting my xtics, that are in my data
>>> file, but i dont need that...
>>> Im calling gnuplot from C via pipes.
>>> 
>>> CODE:
>>> 
>>> void plotBox(FILE *pipe)
>>> {
>>>     fprintf(pipe, "set grid\n"); // show grid
>>> //    fprintf(pipe, "show grid\n");
>>>     fprintf(pipe, "set boxwidth 0.9 relative\n");
>>>     fprintf(pipe, "set style fill   solid 1.00 border lt -1\n");
>>>     fprintf(pipe, "set key outside right top vertical\n"); // show
>>> legend
>>>     fprintf(pipe, "set style data histograms\n"); // plot data in
>>> histograms
>>>     fprintf(pipe, "set style histogram clustered\n");
>>>     fprintf(pipe, "set datafile missing '-'\n");
>>>     fprintf(pipe, "set ytics 0,1\n");
>>>     fprintf(pipe, "set xtics border in scale 0,0 nomirror rotate by -45
>>> autojustify\n");
>>>     fprintf(pipe, "set xtics  norangelimit font ',13'\n");
>>>     fprintf(pipe, "set xtics   ()\n");
>>>     fprintf(pipe, "set title 'boxiishi' \n");
>>> //    fprintf(pipe, "set yrange [ 0.00000 : 300000. ] noreverse
>>> nowriteback\n");
>>> //    fprintf(pipe, "i = 22\n");
>>>     fprintf(pipe, "plot 'data.d' using 1:xtic(1) t col, '' u 2 ti col,
>>> '' u 3 ti col, '' u 4 ti col\n");
>>> //    fprintf(pipe, "plot 'data.d' using 2 ti col, '' u 3 ti col, '' u 4
>>> ti col\n");
>>> }
>>> 
>>> and this is what i get.
>>>  http://old.nabble.com/file/p33900443/histogram.jpeg 
>>> 
>>> I havent found my answer anywhere, so i posted here :)
>>> 
>>> 
>> 
>> 
> 
> 

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Never mind. My data file was not formatted correctly. I had blank lines
between each data line. Plot will not do "with lines" in that case.

use table mode:

set table 'somefilename'
plot ... smooth ...
unset table
fit somefunction(x) 'somefilename' ...


terriblement wrote:
> 
> Hi everybody :)
> 
> I've a file with >100 000 points, which describe an exponential function,
> but as the curve is not smooth at all, the fit doesn't match.
> 
> I want to use the smooth function of GNUPLOT, and then do a fit of the
> "smoothered" curve.
> 
> Is that possible ?
> 
> Thank you :)
> 

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On 23.05.2012 14:57, terriblement wrote:

> I've a file with>100 000 points, which describe an exponential function,
> but as the curve is not smooth at all, the fit doesn't match.

That conclusion is most probably invalid.  Neither the sheer number of 
data points, nor the data being noisy, will cause the fit not to 
"match", just like that.

More likely 1) the original assumption that an exponential will match 
that data is wrong, or 2) you're hitting a technical limit of gnuplot's 
current implementation of 'fit'.

yeah thank you :)


Thomas Sefzick wrote:
> 
> use table mode:
> 
> set table 'somefilename'
> plot ... smooth ...
> unset table
> fit somefunction(x) 'somefilename' ...
> 
> 
> terriblement wrote:
>> 
>> Hi everybody :)
>> 
>> I've a file with >100 000 points, which describe an exponential function,
>> but as the curve is not smooth at all, the fit doesn't match.
>> 
>> I want to use the smooth function of GNUPLOT, and then do a fit of the
>> "smoothered" curve.
>> 
>> Is that possible ?
>> 
>> Thank you :)
>> 
> 
> 

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set 'gap' to an odd number:

set style histogram gap 1


choc wrote:
> 
> Hi,
> 
> I want to plot a histogram in using the standard histogram style.
> However, the clustered bars are not centered about the corresponding label
> at the x-axis.
> 
> This is a sample code to show how I want to use it:
> 
> reset
> set style data histograms
> set style histogram cluster
> plot '-' u 1
> 10
> e
> 
> If I got it right, the result should be a single bar of height 10,
> centered about 0 at the x-axis.
> Yet the bar is not centered, but its left border is placed at 0:
> 
>  http://old.nabble.com/file/p33870960/histogram.png 
> 
> So it is 0.5 * boxwidth too far to the right. If I include a second data
> line, it is the same: the xtic should be exactly between the two bars, yet
> it appears at the center of bar 1, so again the bars are 0.5 * boxwidth
> too far to the right. This is always the case, no matter how many bars are
> plotted.
> 
> Am I missing any option to get the histogram clusters centered? Or is
> there a way to "move" the bars by 0.5 * boxwidth to the left?
> 
> By the way, I'm using Version 4.4 patchlevel 2 on a Fedora system.
> 
> Thanks for any hint!
> 
> Andreas
> 

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Hi,

Some examples of histogram is available on
http://www2.fct.unesp.br/docentes/carto/galo/web/gnuplot/gnu_exemplos5.htm

Regards

Mauricio Galo

>
> Hi,
>
> I want to plot a histogram in using the standard histogram style.
> However, the clustered bars are not centered about the corresponding label
> at the x-axis.
>
> This is a sample code to show how I want to use it:
>
> reset
> set style data histograms
> set style histogram cluster
> plot '-' u 1
> 10
> e
>
> If I got it right, the result should be a single bar of height 10, centered
> about 0 at the x-axis.
> Yet the bar is not centered, but its left border is placed at 0:
>
> http://old.nabble.com/file/p33870960/histogram.png
>
> So it is 0.5 * boxwidth too far to the right. If I include a second data
> line, it is the same: the xtic should be exactly between the two bars, yet
> it appears at the center of bar 1, so again the bars are 0.5 * boxwidth too
> far to the right. This is always the case, no matter how many bars are
> plotted.
>
> Am I missing any option to get the histogram clusters centered? Or is there
> a way to "move" the bars by 0.5 * boxwidth to the left?
>
> By the way, I'm using Version 4.4 patchlevel 2 on a Fedora system.
>
> Thanks for any hint!
>
> Andreas
> --
> View this message in context:
> http://old.nabble.com/Histograms-not-centered-at-x-axis-tp33870960p33870960.html
> Sent from the Gnuplot - User mailing list archive at Nabble.com.
>
>
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Thanks a lot, that's ok now.

Have a nice day.


Thomas Sefzick wrote:
> 
> use one 'plot' command and add the individual plots without
> line feed and leading comma:
> 
> #!/bin/bash
> 
> scriptfile="my_plot.gps"
> 
> # we want a fresh script file
> rm -f $scriptfile
> 
> echo 'set terminal jpeg' >> $scriptfile
> echo 'set output "all_plots.jpg"' >> $scriptfile
> 
> # one plot command only
> echo -n 'plot' >> $scriptfile
> 
> # the first plot is undefined. thus we start the real
> # plots with the second plot and can use a leading ","
> # all the time.
> echo -n ' 0/0' >> $scriptfile
> 
> # iterate over *.dat files
> for i in *.dat
> do
>    echo -n ",'$i' u 1:2 w l title 'data from $i'" >> $scriptfile
> done
> 
> #call gnuplot
> gnuplot $scriptfile
> 
> # delete temporary file
> rm $scriptfile
> 
> 
> Darkknight85 wrote:
>> 
>> Hi i want to plot all the files .dat in my folder in one only graph, such
>> as (plot "file1.dat" using 1:2 with lines, "file2.dat" using 1:2 and so
>> on....), i've found this ubuntu's script:
>> 
>> # write a gnuplot script
>> echo 'set terminal jpeg' >> my_plot.gps
>> 
>> # iterate over .txt files
>> for i in *.dat
>> do
>>     # create appropriate name for resulting image
>>     filename=`echo $i | sed 's/dat/jpg/'`
>> 
>>     # add seperate plots for each file
>>     echo "set output '$filename'" >> my_plot.gps
>>     echo "plot '$i' u 1:2 w l title 'data from $i'" >> my_plot.gps
>>     echo "reset" >> my_plot.gps
>> done
>> 
>> # call gnuplot
>> gnuplot my_plot.gps
>> 
>> # delete temporary file
>> rm my_plot.gps
>> 
>> Ok, but if i want a script that paint all files .dat in one only graph?(
>> 
> 
> 

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On 20.05.2012 05:22, meino.cramer@... wrote:
> The values of the data I want to plot are in the range
> of 0-65535, integers only.
>
> But they represent float values in the range of 0.9 to 2.7

You want to study the documentation, starting with "help using".

Maybe some script-fu like this will do it for you?

http://users.softlab.ntua.gr/~ttsiod/gnuplotStreaming.html