[Octave-bug-tracker] [bug #42487] issymmetric incompatible with Matlab

[Markus Bergholz]

Follow-up Comment #2, bug #42487 (project octave):

I cannot apply this patch. I did it manually, but some of the asserts are
failing. Furthermore, the Matlab example results from their website doesn't
match to the results from this patch (or with any other Version of octave).

Furthermore, it seems like this patch is partly used already, because the
issymmetric version in 3.8.2 differs from the current hg version. 

Octave 3.8.2

    octave:1> issymmetric (logical (eye (2)))
    ans =                    0

Current hg version

    >> issymmetric (logical (eye (2)))
    ans =                    1


What are the results in Matlab?


    %!assert (issymmetric (1))
    %!assert (issymmetric (1), 'noskew')
    %!assert (! issymmetric ([1, 2]))
    %!assert (issymmetric ([]))
    %!assert (issymmetric ([]), 'noskew')
    %!assert (issymmetric ([1, 2; 2, 1]))
    %!assert (! (issymmetric ("test")))
    %!assert (issymmetric ([1, 2.1; 2, 1.1], 0.2))
    %!assert (issymmetric ([1, 2i; 2i, 1]))
    %!assert (issymmetric ([1, 2i; 2i, 1], 'noskew'))
    %!assert (! (issymmetric ("t")))
    %!assert (! (issymmetric (["te"; "et"])))
    %!assert (issymmetric (speye (100000)))
    %!assert (issymmetric (speye (100000), 'noskew'))
    %!assert (issymmetric (logical (eye (2))))
    %!assert (issymmetric (logical (eye (2)), 'skew'))
    
    %!test
    %! a = [0, 2; -2, 0];
    %! assert (issymmetric (a, 'skew'))
    %! assert (! issymmetric (a, 'noskew'))
    
    %!test
    %! s.a = 1;
    %! assert (! issymmetric (s));
    
    %!error issymmetric ([1, 2; 2, 1], 0, 0)
    %!error issymmetric ()



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