save a plot as a png in gnuplot and C

Question

I have been able to use gnuplot to plot graphs as I run my program, but now I want to write the graphs to files. The following code opens a plot and creates a png, but the png does not open (Gimp says it is corrupted). Admittedly I don't really understand the code I've written, because it's taken from snippets online. Does anyone know what's wrong? All I want to do is be able to save my scatter graph as a png.

#include <iostream>
#include "gnuplot_i.h"
#include <math.h>
using namespace std;

int main() {
 double average_distance[5] = {1, 3, 5, 2, 4};
 double x_coord[5] = {1, 2, 3, 4, 5};
 gnuplot_ctrl* h1 = gnuplot_init();
 gnuplot_setstyle(h1, "points");
 gnuplot_cmd(h1, "set output 'test-plot-1.png'");
 gnuplot_plot_xy(h1, x_coord, average_distance, 5, "plot");
 gnuplot_cmd(h1,"set terminal x11" );
 sleep(400);
 return 0;
}

tripleee · Accepted Answer · 2011-09-03 12:23:20Z

4

You want set terminal png instead.

answered Sep 3, 2011 at 12:23

tripleee

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2 Comments

Andrew Over a year ago

thanks for your reply. i've made that change but i still can't open the png file :(

Andrew Over a year ago

ok, i figured it out. i had to add set terminal png before the set output command

abalakin · Accepted Answer · 2011-09-04 15:10:36Z

-1

Why not to use MathGL (GPL plotting library) which can native export to PNG/EPS/SVG/... and can do it even in console (i.e. without X) ?

answered Sep 4, 2011 at 15:10

abalakin

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