Idx.Permutation

By range and indexes

Creates a Permutation for the given range and indexes.

There are three rules which must be followed:

• Sizes must be equal = range.size == indexes.size
• Interval must not repeat
• Interval must be within range = indexes.stream.isEvery(range.contains)

  Idx.Permutation(3 <> 6, Ints(6, 5, 4, 3)).tp
  // Output
  Permutation{range=3 <>> 7,(3,6)(4,5)(5,4)(6,3)}

No mappings

Creates a Permutation for the given range, where all indexes are at their right places.

Applying this Permutation will bring no actions

By mappings

Creates a Permutation by specifying a stream of mappings

  Idx.Permutation.self(Stream((5, 7),(7, 5))).tp
  // Output
  Permutation{range=5 <>> 8,(5,7)(7,5)}

Ordering permutation

Creates a Permutation for the given index, which if applied, will be equivalent to doing sort