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reverse sorting indices.

Sort functions (as LegCharge.sort()) return a (1D) permutation perm array, such that sorted_array = old_array[perm]. This function inverts the permutation perm, such that old_array = sorted_array[inverse_permutation(perm)].

perm1D array_like

The permutation to be reversed. Assumes that it is a permutation with unique indices. If it is, inverse_permutation(inverse_permutation(perm)) == perm.

inv_perm1D array (int)

The inverse permutation of perm such that inv_perm[perm[j]] = j = perm[inv_perm[j]].