# 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:
    A `numpy.ndarray`

      Original matrix.

    k int

      Rank of ID.

    idx `numpy.ndarray`

      Column index array.

  Returns:
    `numpy.ndarray`

      Skeleton matrix.