[Octave-bug-tracker] [bug #50359] clearer documentation for difference between isnull and isempty

[Mike Miller]

Follow-up Comment #9, bug #50359 (project octave):

Ernst - the only reason for this difference to exist is because it must for
Matlab compatibility.

Matlab strictly differentiates between the two assignments jwe shows in
comment #7, so Octave must as well. This is the entire reason for the
existence of the null type and why it loses its type upon assignment to a
variable. Once a null type is assigned, it is no longer null. The only utility
of the null type is for this assignment syntax that allows elements of an
array to be deleted.

Thus the only use of the isnull function is probably in an overloaded class
implementation of the subsasgn method.

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