#### Previous topic

numpy.matrix.H

#### Next topic

numpy.matrix.A

# numpy.matrix.I

`matrix.``I`

  Returns the (multiplicative) inverse of invertible self.

  Parameters: | None
  Returns: | ret : matrix object If self is non-singular, ret is such that `ret * self` == `self * ret` == `np.matrix(np.eye(self[0,:].size)` all return `True`.
  Raises: | numpy.linalg.LinAlgError: Singular matrix If self is singular.

  See also

  `linalg.inv`

  Examples

      >>> m = np.matrix('[1, 2; 3, 4]'); m
      matrix([[1, 2],
              [3, 4]])
      >>> m.getI()
      matrix([[-2. ,  1. ],
              [ 1.5, -0.5]])
      >>> m.getI() * m
      matrix([[ 1.,  0.],
              [ 0.,  1.]])