[Octave-bug-tracker] [bug #53434] isprime.m:missing error, warning for negative numbers

[Rik]

Update of bug #53434 (project octave):

             Open/Closed:                    Open => Closed                 

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Follow-up Comment #7:

Octave generally views itself as a superset of Matlab.  If an Octave function
can do everything the equivalent Matlab function does, and also improve on it
by operating on a larger input domain, then we choose that course.

It may be of use mostly to number theoreticians, but there is such a thing as
"prime" for negative numbers so Octave implemented it.

The situation is not the same for the primes() function.  The implicit
definition of primes() is the the list of primes from 1 to the input N.  If N
is negative then the list is empty.  And for compatibility with Matlab, Octave
does not issue an error that the list is empty, it just returns an empty
list.



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