now you can still use column access
previously...
mat[2] = 1, 2, 3
needed to be converted into...
mat[0][2] = 1
mat[1][2] = 2
mat[2][2] = 3
but with column access you can do...
mat.col[2] = 1, 2, 3
Having 'row' attribute is a bit redundant since direct indexing on a matrix uses row but included for completeness.