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Minor MATLAB/Octave logical incompatibility


From: Randy Gober
Subject: Minor MATLAB/Octave logical incompatibility
Date: Sun, 5 Sep 2004 15:58:07 -0500

Looking at the online MATLAB documentation for the logical command, I noticed this tidbit:


"Most arithmetic operations remove the logicalness from an array. For example, adding zero to a logical array removes its logical characteristic. A = +A is the easiest way to convert a logical array, A, to a numeric double array."

(From http://www.mathworks.com/access/helpdesk/help/techdoc/ref/logical.html)

However, Octave keeps the type as bool in this case, in the just realest 2.1.58, we have:

octave:1> A=logical(eye(3));
octave:2> islogical(A)
ans = 1
octave:3> A=+A;
octave:4> islogical(A)
ans = 1
octave:5> islogical(eye(3))
ans = 0

(also verified using 'whos')

I am not sure if this is a bug or a feature, but it is different from the way MATLAB does it.





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