What is gnuplot_i?
gnuplot_i is a C module that allows an easy interfacing to the gnuplot plotting program. In short: it allows you to send plotting requests to gnuplot from a C program.
What do I need to compile and use it?
You need a C or C++ compiler (C compiler preferred) to compile the module.
How do you compile this on Ubuntu?
You probably want to add #include <unistd.h>. Tested on Ubuntu 16.10 (thanks Sebastian K!).
Is there any trouble compiling it with a C++ compiler?
Some people have reported some warnings about missing casts. It seems
that many C++ compilers are picky about converting pointer types. There
is no generic solution to this problem. Either you are ready to modify
this module by yourself to shut up all potential C++ compiler warnings
(and errors), or you compile it as a C module and link your C++ programs
Notice that many C++ compilers will happily compile the module without complaints, though.
How do I compile it with Visual C++?
I have no idea.
Which platforms are supported?
Since gnuplot_i makes use of pipes, the notion of pipes must be
present and supported by your C library for the module to compile. More
specifically, the popen() system call must be supported.
Virtually all Unix flavours support this system call, so you should not have any problem using this module on Linux, Solaris, HPUX, IRIX, AIX, Tru64, BSD, etc. All POSIX-compliant platforms should also be supported, although this has not been tested.
On Windows you will need to emulate POSIX stuff with the appropriate libraries.
Does it work on Windows?
Yes, using mingw64.
Can you help me use this module under Windows?
Can I replace the call to popen() by a call to system()?
Yes, but you would loose the capacity of plotting user-defined list of doubles and lists of points.