[Octave-bug-tracker] [bug #43041] isprime(7i) returns true

[Colin Macdonald]

URL:
  <http://savannah.gnu.org/bugs/?43041>

                 Summary: isprime(7i) returns true
                 Project: GNU Octave
            Submitted by: cbm
            Submitted on: Thu 21 Aug 2014 04:23:21 PM GMT
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

isprime(4i) is false which I can live with :)

isprime(7i) gives true: it should either give false or raise an exception.

Matlab gives an error "All entries of X must be nonnegative integers."

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Our error message for isprime(-1) needs a tweak too:
"error: isprime: needs positive integers".

Should say "nonnegative integers"

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I might around to patching this but submitting the bug in case I don't!




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