11.10.2.9 Including Graphics

To include external graphics, e.g., a graphic called ‘my_graphic.png’ at the same location as the published Octave script, use the following syntax.

Alternatively, you can write the full path to the graphic.

##
#
# <<my_graphic.png>>
#
# <</full/path/to/my_graphic.png>>
#
# <<../relative/path/to/my_graphic.png>>
#

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https://octave.org/doc/v5.2.0/Including-Graphics.html