[Octave-bug-tracker] [bug #63444] "if (COND)" is much slower than "if (all (COND))"

[John W. Eaton]

Follow-up Comment #9, bug #63444 (project octave):

I tried with "NDArray A" and "const NDArray A" and the difference in execution
time is about the same but the percentage change is less significant when
using the non-const NDArray because the overhead of the indexing operation is
much higher.

It seems to me that we could do slightly better with a single loop that does
both operations but I don't know that it is worth the trouble.

Also, I guess we should be careful about the difference between "if (val)" and
"if (all (val))", not just when val might be empty but also if it might
contain NaN elements.  I wouldn't have thought about the latter case before
today.


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