gftool.matrix.Decomposition.reconstruct

Decomposition.reconstruct(eig=None, kind='full')

Get matrix back from Decomposition.

If the reciprocal of self.eig was taken, this corresponds to the inverse of the original matrix.

Parameters:

eig(…, N) np.ndarray, optional

Alternative value used for self.eig. This argument can be used instead of modifying self.eig.

kind{‘diag’, ‘full’} or str

Defines how to reconstruct the matrix. If kind is ‘diag’, only the diagonal elements are computed, if it is ‘full’ the complete matrix is returned. Alternatively a str used for subscript of numpy.einsum can be given.

Returns:

(…, N, N) or (…, N) np.ndarray

The reconstructed matrix. If a subscript string is given as kind, the shape of the output might differ.