(matrices)
return ByteMatrix._create_from_rows([
        _row for _mat in matrices for _row in _mat._rows
    ])
Vertically concatenate matrices.
Vertically concatenate matrices.
Vertically concatenate matrices .
def vstack(matrices):
    """Vertically concatenate matrices."""
    return ByteMatrix._create_from_rows([
        _row for _mat in matrices for _row in _mat._rows
    ])
def vstack ( matrices ) : return ByteMatrix . _create_from_rows ( [ _row for _mat in matrices for _row in _mat . _rows ] )