(octave.info)Introduction to Plotting

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15.1 Introduction to Plotting
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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.  Note: 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 Note: 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}.