mario, a Fortran90 code which creates a file of commands to gnuplot() that can be used to plot a sort of "needlepoint" image of Mario, as an array of colored squares.
The information on this web page is distributed under the MIT license.
mario is available in a C version and a C++ version and a Fortran90 version and a MATLAB version and an Octave version and a Python version.
gnuplot_test, Fortran90 codes which write data and command files so that gnuplot() can create plots.
ISING_2D_SIMULATION, a Fortran90 code which carries out a Monte Carlo simulation of an Ising model, a 2D array of positive and negative charges, each of which is likely to flip to be in agreement with neighbors, using gnuplot to make images of the initial and final configurations.