Language.Hakaru.Util.Extras

Functions on lists and sequences. Some of the functions follow the style of Data.Random.Extras (from the random-extras package), but are written for use with PRNGs from the "mwc-random" package rather than from the "random-fu" package.

Documentation

extract :: Seq a -> Int -> Maybe (Seq a, a)

randomExtract :: Seq a -> GenIO -> IO (Maybe (Seq a, a))

randomElems :: Ord a => Seq a -> Int -> IO (Seq a)

Given a sequence, return a *sorted* sequence of n randomly selected elements from *distinct positions* in the sequence

randomElemsTR :: Ord a => Seq a -> Seq a -> GenIO -> Int -> IO (Seq a)

pieces :: Seq a -> Seq Int -> [Seq a]

Chop a sequence at the given indices. Assume number of indices given < length of sequence to be chopped

randomPieces :: Int -> Seq a -> IO [Seq a]

Given n, chop a sequence at m random points where m = min (length-1, n-1)

pairs :: [a] -> [(a, a)]

pairs [1,2,3,4]

(1,2),(1,3),(1,4),(2,3),(2,4),(3,4)

> pairs [1,2,4,4]

(1,2),(1,4),(1,4),(2,4),(2,4),(4,4)

l2Norm :: Floating a => [a] -> a