statistics-0.16.1.0: A library of statistical types, data, and functions
Copyright(c) 2009 2010 2011 Bryan O'Sullivan
LicenseBSD3
Maintainerbos@serpentine.com
Stabilityexperimental
Portabilityportable
Safe HaskellNone
LanguageHaskell2010

Statistics.Function

Description

Useful functions.

Synopsis

Scanning

minMax :: Vector v Double => v Double -> (Double, Double) Source #

Compute the minimum and maximum of a vector in one pass.

Sorting

sort :: Vector Double -> Vector Double Source #

Sort a vector.

gsort :: (Ord e, Vector v e) => v e -> v e Source #

Sort a vector.

sortBy :: Vector v e => Comparison e -> v e -> v e Source #

Sort a vector using a custom ordering.

partialSort Source #

Arguments

:: (Vector v e, Ord e) 
=> Int

The number k of least elements.

-> v e 
-> v e 

Partially sort a vector, such that the least k elements will be at the front.

Indexing

indexed :: (Vector v e, Vector v Int, Vector v (Int, e)) => v e -> v (Int, e) Source #

Zip a vector with its indices.

indices :: (Vector v a, Vector v Int) => v a -> v Int Source #

Return the indices of a vector.

Bit twiddling

nextHighestPowerOfTwo :: Int -> Int Source #

Efficiently compute the next highest power of two for a non-negative integer. If the given value is already a power of two, it is returned unchanged. If negative, zero is returned.

Comparison

within Source #

Arguments

:: Int

Number of ULPs of accuracy desired.

-> Double 
-> Double 
-> Bool 

Compare two Double values for approximate equality, using Dawson's method.

The required accuracy is specified in ULPs (units of least precision). If the two numbers differ by the given number of ULPs or less, this function returns True.

Arithmetic

square :: Double -> Double Source #

Multiply a number by itself.

Vectors

Combinators

for :: Monad m => Int -> Int -> (Int -> m ()) -> m () Source #

Simple for loop. Counts from start to end-1.

rfor :: Monad m => Int -> Int -> (Int -> m ()) -> m () Source #

Simple reverse-for loop. Counts from start-1 to end (which must be less than start).