numpy.matrix.getI

method

matrix.getI() [source]

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.]])

© 2005–2019 NumPy Developers
Licensed under the 3-clause BSD License.
https://docs.scipy.org/doc/numpy-1.16.1/reference/generated/numpy.matrix.getI.html