Gnuplot Dev C++

Posted By admin On 03.05.20
P: n/a
Blah wrote:
I'm trying to use the system() in a C++ program to execute gnuplot on
a file of data on OSX and have the graph pop up but so far the only
thing I've managed to do is get gnuplot to open.
as I minor test I did (unrelated stuff excised)
#include <stdlib.h>
int system(const char *string);
system('gnuplot');
system('plot sin(x)');
and the only thing that happened was gnuplot opening in terminal. For
that matter typing
plot sin(x) doesn't do anything even if it is typed manually into
terminal with gnuplot started. The graph only pops up if I enter it
directly into the console that opens when clicking on gnuplot in
finder. Anyway to fix this or more easily load a file to gnuplot from
the other program?
How system works is implementation-defined, so how to use it will depend on
your compiler. But to give you a hint, this works on my system:
std::ofstream file('file');
file << 'plot sin(x)n';
file.close();
std::system('gnuplot file');
If you want a more system specific solution, not creating a file, try:
#include <cstdio>
std::FILE *f = popen('gnuplot', 'w');
std::fputs('plot sin(x)n', f);
std::fflush(f);
..
std::fclose(f);
popen() is, however not part of the C++ standard library, so the discussion
of it would be off topic here.
--
rbh

You can pass the path to your gnuplot executable, along with any commandline parameters:Gnuplot gp('gnuplot -persist');

Download gnuplot for free. A portable, multi-platform, command-line driven graphing utility. A famous scientific plotting package, features include 2D and 3D plotting, a huge number of output formats, interactive input or script-driven options, and a large set of scripted examples.

If constructed with no parameters,Gnuplot gp;then the enviroment variable GNUPLOT_IOSTREAM_CMD is used if set, otherwise a guess is made as to the best command to use for your operating system (usually gnuplot -persist).

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If you pass a FILE * then everything is sent there instead of to gnuplot:Gnuplot gp(fopen('script.gp', 'w'));You can also write to a file this way:Gnuplot gp('>script.gp');Outputting to console is useful for debugging:Gnuplot gp(stdout);

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Also useful for debugging is to set GNUPLOT_IOSTREAM_CMD='cat' to send the commands to console or GNUPLOT_IOSTREAM_CMD='>script.gp' to write to a file.

NOTE: Windows support is a bit dodgy. If you can make it better let me know. There are some hints on the Portability page.

Gnuplot Cpp

Commands are sent to gnuplot using the << operator.gp << 'set xrange [0:1]n';Don't forget the newline at the end of each command!

There are several method for sending data, the basic two being send1d(data) and send2d(data). The 1d functions are for things like points and curves. The 2d functions are for surfaces and images. This is explained in more detail on the datatypes page.

Gnuplot Dev C Tutorial

The most basic usage is to send the data through gnuplot's stdin, like so:gp << 'plot '-' with pointsn';gp.send1d(data);

To send using temporary files:gp << 'plot' << gp.file1d(data) << 'with pointsn';

To send using non-temporary files:gp << 'plot' << gp.file1d(data, 'filename.dat') << 'with pointsn';

Gnuplot Development

You can send data in binary format rather than text, and this is probably a bit more efficient:gp << 'plot' << gp.binFile1d(data, 'record') << 'with pointsn';

Gnuplot Dev C Pdf

There are several examples in the source:

Gnuplot Examples

  • example-misc.cc - Shows basic usage, temporary files, binary files, and various other things.
  • example-interactive.cc - Demonstrates handling mouse click events. Currently only works in Linux.
  • example-data-1d.cc - Demonstration of various ways data can be passed, for 1d data (curves). This should plot a series of intertwined curves in the shape of a torus, with each curve being passed using a different type of container. This is meant to demonstrate all the different types of containers you can use to pass your data.
  • example-data-2d.cc - Similar to the above but for 2d data. Should plot a segmented torus, with each segment corresponding to a different type of container.