Returns the path to Octave home directory, i.e. the directory that contains
bin/ sub-directory where Octave binaries can be found,
/usr/ on Linux machines.
character strings that are appended to Octave path
logical that indicates if one should directly return the path that was used when configuring (i.e. installing) RcppOctave
logical that indicates if one should try
The path to Octave home directory is determined in the following order:
value of global option
value of the environment variable
path used during configuration/installation of RcppOctave.
path returned by
octave-config, which is itself looked up
in the system PATH.
If set, the global option or environment variable should contain the absolute path to Octave root directory.
a character string, or
NULL if the path was not found.
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