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small correction

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nilsbecker 2017-06-24 13:45:49 +02:00 • committed by GitHub
parent 4058fc799e
commit a2b2eaec2e
1 changed files with 4 additions and 3 deletions
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7
src/core/CCArray.mli
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@ -72,10 +72,11 @@ val sorted : ('a -> 'a -> int) -> 'a t -> 'a array
val sort_indices : ('a -> 'a -> int) -> 'a t -> int array
(** [sort_indices cmp a] returns a new array [b], with the same length as [a],
such that [b.(i)] is the index at which the [i]-th element of [sorted cmp a]
appears in [a].
appears in [a]. [a] is not modified.
In other words, [map (fun i -> a.(i)) (sort_indices cmp a) = sorted cmp a].
[a] is not modified.
[sort_indices] yields the inverse permutation of {!sort_ranking}.
@since 1.0 *)
val sort_ranking : ('a -> 'a -> int) -> 'a t -> int array
@ -84,7 +85,7 @@ val sort_ranking : ('a -> 'a -> int) -> 'a t -> int array
in [sorted cmp a]. [a] is not modified.
In other words, [map (fun i -> (sorted cmp a).(i)) (sort_ranking cmp a) = a].
[sort_ranking] gives the inverse permutation of {!sort_indices}.
[sort_ranking] yields the inverse permutation of {!sort_indices}.
In the absence of duplicate elements in [a], we also have
[lookup_exn a.(i) (sorted a) = (sorted_ranking a).(i)]