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Earlier versions of Octave provided plotting through the use of
gnuplot. This capability is still available. But, a newer plotting
capability is provided by access to OpenGL. Which plotting system
is used is controlled by the graphics_toolkit function.
See Graphics Toolkits.
The function call graphics_toolkit ("qt") selects the
Qt/OpenGL system, graphics_toolkit ("fltk") selects the
FLTK/OpenGL system, and graphics_toolkit ("gnuplot") selects the
gnuplot system. The three systems may be used selectively through the use
of the graphics_toolkit property of the graphics handle for each
figure. This is explained in Graphics Data Structures.
Caution: The OpenGL-based toolkits use single precision
variables internally which limits the maximum value that can be
displayed to approximately 10^{38}. If your data contains larger
values you must use the gnuplot toolkit which supports values up to
10^{308}.