[Octave-bug-tracker] [bug #48867] delete elements from array with indirect empty matrix

[John W. Eaton]

Follow-up Comment #4, bug #48867 (project octave):

I'm pretty sure this is a bit of a kluge to allow "x(idx) = []" to work for
classes the same way as for ordinary built-in objects.  For objects, the
syntax is converted to a call to the subsasgn method for the class (if it is
defined).  Because [] is an empty double array, it makes sense to limit it to
this type, and I assume, also a 0x0 array, not 0x1, or any other shape of
empty array.  But because the literal [] empty array loses its special status
when it is assigned to a variable or passed to a function, subsasgn must
accept "zeros(0,0)" as well.  And, because subsasgn can work for built-in
types, it must also work this way for them.

Amro, can you verify that zeros(0,0) works but zeros(0,0,1,0) does not?

Mike, your patch should be fine, but if I'm right about the 0x0 thing, then it
should probably use is_zero_by_zero instead of is_empty.  I just fixed
is_zero_by_zero so that it requires exactly two dimensions and that both are
0.

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