From bug-octave-request at bevo dot che dot wisc dot edu  Tue Dec 10 12:42:05 2002
Subject: 0*NaN within matrix multiplication
From: Schloegl Alois <alois dot schloegl at tugraz dot at>
To: bug-octave at bevo dot che dot wisc dot edu
Date: Tue, 10 Dec 2002 19:39:17 +0100 (MET)

octave> x=[-2:2;4:8]';
octave> y=x;y(2,1)=nan;y(4,2)=nan;
octave> B=[1,0,2;0,3,1];
octave> 
octave> (y*B)'
ans =

    -2   NaN     0     1     2
    12    15    18   NaN    24
     0   NaN     6   NaN    12

octave> B'*y'
ans =

    -2   NaN     0   NaN     2
    12   NaN    18   NaN    24
     0   NaN     6   NaN    12


The same behaviour is observed in 2.1.40
Is this a bug or an undocumented feature? 

 A. 




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