matrix.getI()

matrix.getI() [source]

Returns the (multiplicative) inverse of invertible self.

Parameters:

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.

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.

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.]])

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