Ionut's WebSpace » Gnuplot http://www.vioan.ro/wp Exploring Creativity Is My Passion Sun, 08 Aug 2010 21:09:58 +0000 http://wordpress.org/?v=2.8.4 en hourly 1 Software I am using … http://www.vioan.ro/wp/2008/11/15/software-i-am-using/ http://www.vioan.ro/wp/2008/11/15/software-i-am-using/#comments Fri, 14 Nov 2008 23:57:30 +0000 ionut http://www.vioan.ro/wp/?p=275 If you would like to see what software I am using on my desktop, laptop, workstation (Windows, Linux, Unix) in order to get my research/scientific work done, or if you want to know what software I am installing on my servers for customers, check this section of my website.

]]> http://www.vioan.ro/wp/2008/11/15/software-i-am-using/feed/ 1 Scientific Software http://www.vioan.ro/wp/2008/11/14/scientific-software/ http://www.vioan.ro/wp/2008/11/14/scientific-software/#comments Fri, 14 Nov 2008 15:41:13 +0000 ionut http://www.vioan.ro/wp/?p=256 If you are working in Scientific Computing, like me, then the next links are for you:

]]> http://www.vioan.ro/wp/2008/11/14/scientific-software/feed/ 0 Calling Gnuplot from Perl http://www.vioan.ro/wp/2008/09/30/calling-gnuplot-from-perl/ http://www.vioan.ro/wp/2008/09/30/calling-gnuplot-from-perl/#comments Tue, 30 Sep 2008 21:18:31 +0000 ionut http://www.vioan.ro/wp/?p=163 In my previous post I discussed how to call Gnuplot from C and Python language. If you are using Perl, then, here is the script:

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#!/usr/bin/perl
# Generate postscript and png plot with GNUplot from Perl
# Author: Ioan Vancea
# Usage: Give "data file" as an argument for script
 
use strict;
use warnings;
 
my $file = ARGV[0];
 
# POSTSCRIPT
open (GNUPLOT, "|gnuplot");
print GNUPLOT <<EOPLOT;
set term post color "Courier" 12
set output "$file.ps"
set size 1 ,1
set nokey
set data style line
set xlabel "frequency" font "Courier,14"
set title "Fast Fourier Transform" font "Courier,14"
set grid xtics ytics
set xtics 100
plot "$file" using 1:2 w lines 1
EOPLOT
close(GNUPLOT);
 
# PNG
open (GNUPLOT, "|gnuplot");
print GNUPLOT <<EOPLOT;
set term png small xFFFFFF
set output "$file.png"
set size 1 ,1
set nokey
set data style line
set xlabel "frequency" font "VeraMono,10"
set title "Fast Fourier Transform" font "VeraMono,10"
set grid xtics ytics
set xtics 100
plot "$file" using 1:2 w lines 1
EOPLOT
close(GNUPLOT);
]]> http://www.vioan.ro/wp/2008/09/30/calling-gnuplot-from-perl/feed/ 1 Graphics with Gnuplot from C and Python language http://www.vioan.ro/wp/2008/09/30/graphics-with-gnuplot-from-c-and-python-language/ http://www.vioan.ro/wp/2008/09/30/graphics-with-gnuplot-from-c-and-python-language/#comments Tue, 30 Sep 2008 19:41:31 +0000 ionut http://www.vioan.ro/wp/?p=159 If you are doing a lot of calculations/simulations, like me, using C or/and Python language, you also need to visualize your simulated data. One way to do it is just to generate/write a “data” file and plot it with your plotting preferred package after the simulation is finished. But maybe, sometimes, you want to see the graph in real time, so, here I would like to show a small C and Python program which calls Gnuplot and save the plot in png format.

C Example:

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#include<stdio.h>
/*
	Author: Ioan Vancea (www.vioan.ro)
	*****************************/
int main()
{
	FILE *pipe = popen("gnuplot -persist","w");
	fprintf(pipe, "set samples 40\n");
	fprintf(pipe, "set isosamples 40\n");
	fprintf(pipe, "set hidden3d\n");
	fprintf(pipe, "set xrange [-8.000:8.000]\n");
	fprintf(pipe, "set yrange [-8.000:8.000]\n");
	fprintf(pipe, "set zrange [-2.000:2.000]\n");
	fprintf(pipe, "set terminal png\n");
	fprintf(pipe, "set output 'graph.png'\n");
	fprintf(pipe, "set title 'We are plotting from C'\n");
	fprintf(pipe, "set xlabel 'Label X'\n");
	fprintf(pipe, "set ylabel 'Label Y'\n");
	/* fprintf(pipe, "plot 'datafile.dat' using 1:2\n");*/
	fprintf(pipe, "splot cos(x)+cos(y)\n");
 
  close(pipe);
  return 0;
}

The output:

Python Example (I use Gnuplot.py):

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#!/usr/bin/env python
 
'''
	Author: Ioan Vancea (www.vioan.ro)
'''
 
import math
import Gnuplot
gp = Gnuplot.Gnuplot(persist=1)
x = range(1000)
y = [math.sin(a) + math.cos(a) + math.tan(a) for a in x]
data = Gnuplot.Data(x, y, title='Plotting from Python')
gp('set data style lines')
gp('set xlabel "Label x"')
gp('set ylabel "Label y"')
gp.plot(data);
gp.hardcopy(filename="pyplot.png",terminal="png")

The output:

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