permutation_matrix

permutation_matrix(oneline_notation)

Generate a permutation matrix from one-line notation.

If oneline_notation = [p_0,\dots,p_{d-1}], the returned matrix \(\mathbf{P}\) satisfies \((\mathbf{P}\mathbf{x})_i = x_{p_i}\).

Example

>>> permutation_matrix([2, 0, 1])
array([[0, 0, 1],
       [1, 0, 0],
       [0, 1, 0]])