bugGNU Octave - Bugs: bug #31396, not() and !-operator treats NaN as...

 
 

bug #31396: not() and !-operator treats NaN as true

Submitter:  None
Submitted:  Thu 21 Oct 2010 02:57:20 PM UTC
   
 
Category:  Interpreter Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Incorrect Result
Status:  Fixed Assigned to:  None
Originator Name:  Kim Hansen Originator Email:  -email is unavailable-
Open/Closed:  * Closed Release:  * 3.2.4
Operating System:  * GNU/Linux Fixed Release:  None
Planned Release:  None
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Thu 21 Oct 2010 07:45:36 PM UTC, comment #2: 

It's true that the problem has been fixed for scalars, but it has not yet been fixed for arrays.  I'm working on a patch for that.

John W. Eaton <jwe>
Group administrator
Thu 21 Oct 2010 07:12:10 PM UTC, comment #1: 

This bug exists in the 3.2.4 code, but has been fixed in the Mercurial code repository.  To access the fix you will need to build from source using one of the snapshots (such as 3.3.53) or use Mercurial to get the code directly.  Instructions for downloading the code are here (http://www.gnu.org/software/octave/download.html)

Rik <rik5>
Group administrator
Thu 21 Oct 2010 02:57:20 PM UTC, original submission:  

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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    Follow 2 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2010-10-21 rik5 StatusNone Fixed
        Open/ClosedOpen Closed

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