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newbie question: assigment to N-d arrays returns strange values


From: Amir Seginer
Subject: newbie question: assigment to N-d arrays returns strange values
Date: Sat, 06 Aug 2005 09:31:15 +0300
User-agent: Mozilla Thunderbird 1.0.6-1.1.fc4 (X11/20050720)

Hello,

This might be a known problem, but I couldn't find any reference to it. When assigning to an n-dimensional array (see below) I get results which are different from Matlab. Also, in one case I get some strange values in the array as well.

I wrote the the following code in Octave (using --traditional):

>>  m=zeros(3, 2, 2) ;
>>  a= [1 2 3 4] ;
>> m(3, :) = a
m =

ans(:,:,1) =

        0        0
        0        0
        1        2

ans(:,:,2) =

        0        0
        0        0
        0        0

which is not what I expected (3 and 4 were not assigned). Even worse, when I did

>> m=zeros(3, 2, 2) ;
>> a= [ 1; 2; 3; 4] ;
>> m(3, :) = a
m =

ans(:,:,1) =

        0        0
        0        0
        1        2

ans(:,:,2) =

  0.0e+00  *

      NaN      NaN
      NaN      Inf
      NaN      Inf

This gives strange values on the 2nd "page". Further more, in normal mode the same code gave

octave:8> m=zeros(3, 2, 2) ;
octave:9> a= [ 1; 2; 3; 4] ;
octave:10> m(3, :) = a
m =

ans(:,:,1) =

  0  0
  0  0
  1  2

ans(:,:,2) =

    0.0000e+00   5.1715e-319
   1.1116e-321    0.0000e+00
    0.0000e+00    0.0000e+00

Is there a way to overcome this, or at least get an error/warning. I'm using octave-2.1.71

Thanks,

Amir.



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