numpy.matrix.I¶

matrix.I¶

Returns the (multiplicative) inverse of invertibleself.

Parameters:	None
Returns:	ret : matrix object Ifself is non-singular,ret is such thatret*self ==self*ret ==np.matrix(np.eye(self[0,:].size) all returnTrue.
Raises:	numpy.linalg.LinAlgError: Singular matrix Ifself is singular.

See also

linalg.inv

Examples

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