VectorExtras.Immutable.FoldM.PrimMonad.Index

Documentation

type IndexPrimMonadFoldM result = forall m. PrimMonad m => FoldM m Int result

Fold on indices in PrimMonad.

frequency :: (Vector vector count, Enum count) => Int -> IndexPrimMonadFoldM (vector count)

Given the size of the vector, construct a fold, which produces a vector of frequencies of each index. I.e., the counts of how often it appeared.