65.128 IsInStandardForm

IsInStandardForm( M )
IsInStandardForm( M, idleft )

IsInStandardForm determines if M is in standard form. idleft is a boolean that indicates the position of the identity matrix in M. If idleft is true, IsInStandardForm checks if the identity matrix is at the left side of M, otherwise if it is at the right side. The default for idleft is true. The elements of M may be elements of any field. To put a matrix in standard form, use PutStandardForm (see PutStandardForm).

    gap> IsInStandardForm(IdentityMat(7, GF(2)));
    true
    gap> IsInStandardForm([[1, 1, 0], [1, 0, 1]], false);
    true
    gap> IsInStandardForm([[1, 3, 2, 7]]);
    true
    gap> IsInStandardForm(HadamardMat(4));
    false 

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