[Octave-bug-tracker] [bug #31396] not() and !-operator treats NaN as true

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?31396>

                 Summary: not() and !-operator treats NaN as true
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Thu 21 Oct 2010 02:57:20 PM UTC
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Kim Hansen
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.2.4
        Operating System: GNU/Linux

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Details:

not() and the !-operator treats NaN values as true, I expected them to give
the same error that functions like and(), xor() and logical() does.

octave:1> !NaN
ans = 0
octave:2> if (NaN); end
error: invalid conversion from NaN to logical
octave:2> logical(NaN)
error: invalid conversion from NaN to logical
error: called from:
error:   /usr/share/octave/3.2.4/m/general/logical.m at line 46, column 2
octave:2> and(NaN,true)
error: invalid conversion from NaN to logical
octave:2> 





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