numpy.matrix.getI¶
- 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
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.]])