IsMat( obj )
IsMat
return true
if obj, which can be an object of arbitrary type,
is a matrix and false
otherwise. Will cause an error if obj is an
unbound variable.
gap> IsMat( [ [ 1, 0 ], [ 0, 1 ] ] ); true # a matrix is a list of vectors gap> IsMat( [ [ 1, 2, 3, 4, 5 ] ] ); true gap> IsMat( [ [ Z(2)^0, 0*Z(2) ], [ 0*Z(2), Z(2)^0 ] ] ); true gap> IsMat( [ [ Z(2)^0, 0 ], [ 0, Z(2)^0 ] ] ); false # 'Z(2)\^0' and '0' do not lie in a common field gap> IsMat( [ 1, 0 ] ); false # a vector is not a matrix gap> IsMat( 1 ); false # neither is a scalar
GAP 3.4.4