[Octave-bug-tracker] [bug #43098] "if (array)" should raise a warning

[Lachlan Andrew]

Follow-up Comment #2, bug #43098 (project octave):

I'm looking into this, and noticed that most of the "special" types (diagonal,
sparse etc.) have quite inefficient implementations of is_true().

More seriously,


octave:1> if ([NaN, 1; 1, NaN]), 1, else 0, end
error: invalid conversion from NaN to logical
octave:1> if sparse([NaN, 1; 1, NaN]), 1, else 0, end
ans = 1


Also, I'd like to have the warning issued at most once between each pair of
interactive keyboard events.  Is there a standard mechanism for that? 
Currently I just have a flag that gets set each time interactive_input() is
called.

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