mario, an Octave code which creates a sort of needlepoint image of Mario, as an array of colored squares.
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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.
box_games, an Octave code which contains utilities for creating and displaying simple board games, such as for checkers, or life, or a cellular automaton.
graphics_test, Octave codes which illustrate how various kinds of data can be displayed and analyzed graphically.