[Octave-patch-tracker] [patch #9014] Add "camlight" function

[Markus Mützel]

Follow-up Comment #6, patch #9014 (project octave):

The function __plt_get_axis_arg__ looks for a handle to an axes object. (At
least, I assumed judging by its name.)
Maybe something in the lines of the following would work:

if ( nargin > 0 && isscalar (varargin{1}) && ishghandle (varargin{1}, "light")
)
    h = varargin{1};
    varargin(1) = [];
endif


The chance that a given value for AZ collides with a valid light handle should
be rather low.
Matlab changed in recent version to use objects rather than double values to
represent handles. That would eliminate the last chance for a collision.
However, I am not aware of any plans to do the same step for Octave.

Maybe you could also check for "isscalar" when you check for "isnumeric". That
could help to give more specific error messages.

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