numpy.matrix.getI — NumPy v2.2 Manual (original) (raw)

method

matrix.getI()[source]#

Returns the (multiplicative) inverse of invertible self.

Parameters:

None

Returns:

retmatrix object

If self is non-singular, ret is such that ret * self ==self * ret == np.matrix(np.eye(self[0,:].size)) all returnTrue.

Raises:

numpy.linalg.LinAlgError: Singular matrix

If self is singular.

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.], # may vary [ 0., 1.]])