matrix2d( 3, 2 ) -> [ 0, 0, 0, 1, 0, 2, 1, 0, 1, 1, 1, 2 ]
matrix2d( 3, 2 )
[ 0, 0, 0, 1, 0, 2, 1, 0, 1, 1, 1, 2 ]
matrix2d( 3, 2 )->[ 0, 0, 0, 1, 0, 2, 1, 0, 1, 1, 1, 2 ]