(self, i, f)
In-place operation on row ``i`` using two-arg functor whose args are
        interpreted as ``(self[i, j], j)``.

        Examples
        ========

        >>> from sympy.matrices import eye
        >>> M = eye(3)
        >>> M.row_op(1, lambda v, j: v + 2*M[0, j]); M
        Matrix([
        [1, 0, 0],
        [2, 1, 0],
        [0, 0, 1]])

        See Also
        ========
        row
        zip_row_op
        col_op
In-place operation on row ``i`` using two-arg functor whose args are
        interpreted as ``(self[i, j], j)``.
In - place operation on row i using two - arg functor whose args are interpreted as ( self [ i j ] j ) .
def row_op(self, i, f):
        """In-place operation on row ``i`` using two-arg functor whose args are
        interpreted as ``(self[i, j], j)``.

        Examples
        ========

        >>> from sympy.matrices import eye
        >>> M = eye(3)
        >>> M.row_op(1, lambda v, j: v + 2*M[0, j]); M
        Matrix([
        [1, 0, 0],
        [2, 1, 0],
        [0, 0, 1]])

        See Also
        ========
        row
        zip_row_op
        col_op

        """
        i0 = i*self.cols
        ri = self._mat[i0: i0 + self.cols]
        self._mat[i0: i0 + self.cols] = [ f(x, j) for x, j in zip(ri, list(range(self.cols))) ]
def row_op ( self , i , f ) : i0 = i * self . cols ri = self . _mat [ i0 : i0 + self . cols ] self . _mat [ i0 : i0 + self . cols ] = [ f ( x , j ) for x , j in zip ( ri , list ( range ( self . cols ) ) ) ]