scipy.linalg.interpolative.reconstruct_skel_matrix

scipy.linalg.interpolative.reconstruct_skel_matrix(A, k, idx)

Reconstruct skeleton matrix from ID.

The skeleton matrix can be reconstructed from the original matrix A and its ID rank and indices k and idx, respectively, as:

B = A[:,idx[:k]]

The original matrix can then be reconstructed via:

numpy.hstack([B, numpy.dot(B, proj)])[:,numpy.argsort(idx)]

See also reconstruct_matrix_from_id and reconstruct_interp_matrix.

Parameters

Anumpy.ndarray

Original matrix.

kint

Rank of ID.

idxnumpy.ndarray

Column index array.

Returns

numpy.ndarray

Skeleton matrix.

scipy.linalg.interpolative.reconstruct_interp_matrix scipy.linalg.interpolative.id_to_svd