gnuplot-info — For questions and discussion about gnuplot

Re: [Gnuplot-info] Controlling gnuplot with C Sharp via pipe: freeze

[Frank S. <der...@gm...>]

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#.

Re: [Gnuplot-info] Controlling gnuplot with C Sharp via pipe: freeze

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

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#?

[Gnuplot-info] Controlling gnuplot with C Sharp via pipe: freeze

[Frank S. <der...@gm...>]

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.)

This console program calls gnuplot und plots the function x+y. But after
that, gnuplot is not closed correctly. If you close the wxt window, the
command
gpProc.WaitForExit();
still blocks, although
bind Close "exit gnuplot"
is set in gnuplot.

But in fact, I don’t care about this. The critical point is: If you hit
a key (e. g. try to close the window with q or Alt + F4), gnuplot seems
to hang.

I am using:
– Windows XP 32bit
– gnuplot 4.6.0 (latest released version; same problem with 4.4.4)
– 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 am not sure, whether it is
caused by windows or by gnuplot. In any case gnuplot can be closed
correctly by uncommenting
gpcommands.WriteLine("exit");


Hope you can help or give an advice.
Thanks!


Greetings
Frank

Re: [Gnuplot-info] gnuplot tics

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

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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[Gnuplot-info] Why doesn't this work

[<she...@be...>]

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.

[Gnuplot-info] Why doesn't this work

[<she...@be...>]

Hi

I am trying to do a simple x-y plot with the following very simple script:


set xlabel "y-displacement"
set ylabel "Percent difference"

plot "Results/Channels_12/average_percent_diff.dat" using 1:2 title
'Average' with lines


But it does not work. the legend (key) is visible and indicates that a
solid line will be
used in the plot but there is no line plot of the data visible. If I
remove "with lines"
then I get a point-type plot but I can't seem to get a line-type plot.
What am I doing wrong?

Re: [Gnuplot-info] gnuplot tics

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

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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Re: [Gnuplot-info] fitting a "smoothered" curve

[terriblement <ric...@gm...>]

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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Re: [Gnuplot-info] fitting a "smoothered" curve

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

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'.

Re: [Gnuplot-info] fitting a "smoothered" curve

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

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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[Gnuplot-info] fitting a "smoothered" curve

[terriblement <ric...@gm...>]

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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[Gnuplot-info] recursion limit in 4.6

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

Hi, I was just experimenting with some older code I have in the new 4.6
release and I have discovered that while the 4.4 code seemed to handle
tail recursion moderately well, 4.6 does not see any difference. As a
result, the recursion limit of 250 is slapped on.

E.g. in 4.6
gnuplot> tr(x, s) = (x < 1 ? s : tr(x-1, s+x))
gnuplot> print tr(250,0)
31375
gnuplot> print tr(251,0)
         recursion depth limit exceeded

By contrast, the non tail-recursive function
t(x)     = (x < 1 ? 0 : x+t(x-1))
only has a stack overflow at x=250.

in 4.4, print tr(20000,0) worked fine, while t(99) gave a stack
overflow.

gnuplot> show all

        G N U P L O T
        Version 4.6 patchlevel 0    last modified 2012-03-04
        Build System: Linux i686

Question: is this an intended change?

-- 
Leo Butler                      l_b...@us...
SDF Public Access UNIX System -   http://sdf.lonestar.org

Re: [Gnuplot-info] Gnuplot compile warning on Mac OS X 10.7

[Lopson <gmd...@gm...>]

Ups, problem solved thanks to Homebrew. Nonetheless, thanks for your time.
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Re: [Gnuplot-info] Problem with 3D plot

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

when using 'dgrid3d' the z values in the plot are computed as weighted
averages
or spline interpolation of scattered points. the usage of 'dgrid3d' makes
sense
for non-grid data.

you have grid data, so the only thing you need to do is to seperate the
datablocks
(representing y-isolines) with an empty line in the datafile, i.e. a blank
line between
each x=-20 and x=-6.

then 'unset dgrid3d' and 'splot' again.


Sergiones wrote:
> 
> Hi,
>  
>      I'm starting using gnuplot and I had a problem generating a 3d plot
> using the attached file.
>  
>     Altough all points for  x = -8 has better values than x=-6, the plot
> indicates better values for -6 than for -8. 
>  
>     Following are the parameters I have used:
>  
>    set pm3d
>    set dgrid3d 5,10 
>    set palette defined (0 "black", 0.63 "green", 0.65 "blue", 0.70 "cyan",
> 0.72 "yellow",  0.73 "orange", 1 "red")    
> 
>    Could you please help me to configure it properly?
>  
> Thanks,
> Sergio
> 
> 
>  http://old.nabble.com/file/p33886480/P250_GG1_SP.csv P250_GG1_SP.csv 
> 

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Re: [Gnuplot-info] Histograms not centered at x-axis

[Mauricio G. <ga...@fc...>]

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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Re: [Gnuplot-info] Plot all files in one only graph.

[Darkknight85 <mr...@ho...>]

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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Re: [Gnuplot-info] Put labels on points

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

plot "datafilename" using 1:2 with points, "" using 1:2:3 with labels offset
0,1


deletd wrote:
> 
> Hi,
> 
> I am trying to plot a 2D graph (x,y) and I'd like to put a label over each
> point :
> 
> 
> #x  y   name
> 
>  0   0   label1
>  1   5   label2
>  3   9   label3
>     ...
> 
> 
> Is it possible?
> 
> Thanks in advance!
> 

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Re: [Gnuplot-info] Plot all files in one only graph.

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

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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Re: [Gnuplot-info] Histograms not centered at x-axis

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

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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[Gnuplot-info] Histograms not centered at x-axis

[choc <cho...@gm...>]

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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Re: [Gnuplot-info] data mapping

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

On 20.05.2012 05:22, mei...@gm... 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".

[Gnuplot-info] data mapping

[<mei...@gm...>]

Hi,

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

Is it possible to hide the fact, that this range of float values is
represented by integers completly from the user...will say: 
The axis marking should be according to the float values, the
values printed when sliding with the cursor over the graph 
should be floats, a zoom box (this blue box one can create with the
right mouse button) should print float values and so on...???

Thank you very much in advance for any help!

Best regards,
mcc

Re: [Gnuplot-info] Plotting realtime data from /dev/ttyS0 on Linux

[(((1/f))) <fa...@gm...>]

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

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

Re: [Gnuplot-info] Plotting realtime data from /dev/ttyS0 on Linux

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

On 19.05.2012 09:20, mei...@gm... wrote:

>> From an embedded device I receive data in textual form in the Logview
> OpenFormat-like manner.
>
> I pln to implement a small converter to convert this data into a
> gnuplot readable format.
>
> The thing, which gives me headaches is: Is it possible (and how) to
> read data and stream them into gnuplot so gnuplot is displaying the
> current state (and a little of the past) all the time?

Not really.  gnuplot doesn't do real-time plotting.  It can be plenty 
fast, but it won't do any sliding-window buffering of a continuous input 
stream for you.  You would have to do that yourself (e.g. by filling a 
file with the "little of the past" you want to display), and keep on 
sending "replot" requests to gnuplot to update the display.

[Gnuplot-info] Plotting realtime data from /dev/ttyS0 on Linux

[<mei...@gm...>]

Hi,

before I go in-depth with gnuplot and its manual I want to evaluate,
whether it is the right choice for the task I try to accomplish.

I googled for this but fail to find anything relevant -- nay be due to
the fact that I am no native english speaker and therefore dont have
the right search terms handy.

>From an embedded device I receive data in textual form in the Logview
OpenFormat-like manner.

I pln to implement a small converter to convert this data into a
gnuplot readable format.

The thing, which gives me headaches is: Is it possible (and how) to
read data and stream them into gnuplot so gnuplot is displaying the
current state (and a little of the past) all the time?

Thank you very much in advance for any help!
Best regards,
mcc