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 thatret * self
==self * ret
==np.matrix(np.eye(self[0,:].size)
all returnTrue
.
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.]])
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https://docs.scipy.org/doc/numpy-1.16.1/reference/generated/numpy.matrix.getI.html