permutation_indices

permutation_indices(n, r, dtype=<class 'int'>): 

LLM Docstring

Enumerate all length-r ordered permutations of range(n) as an index array.

• n: int

  size of the pool

• r: int

  length of each permutation

• dtype: np.dtype

  index dtype

• :returns: np.ndarray

  the (n!/(n-r)!, r) permutation-index array