Copyright	(c) Edward Kmett 2013
License	BSD3
Maintainer	Edward Kmett <ekmett@gmail.com>
Stability	experimental
Portability	non-portable
Safe Haskell	None
Language	Haskell2010

Data.Approximate.Numerics

Description

These functions provide wildly inaccurate but very fast approximations to common transcendental functions.

Synopsis

Documentation

class Floating a => Fast a where Source #

Methods

flog :: a -> a Source #

Calculate an approximate log.

fexp :: a -> a Source #

Calculate an approximate exp.

fpow :: a -> a -> a Source #

Calculate an approximate pow.

fpow_lb :: a -> a -> a Source #

fpow_ub :: a -> a -> a Source #

Instances details

Fast Double Source #
Instance details Defined in Data.Approximate.Numerics Methods flog :: Double -> Double Source # flog_lb :: Double -> Double Source # flog_ub :: Double -> Double Source # fexp :: Double -> Double Source # fexp_lb :: Double -> Double Source # fexp_ub :: Double -> Double Source # fpow :: Double -> Double -> Double Source # fpow_lb :: Double -> Double -> Double Source # fpow_ub :: Double -> Double -> Double Source #
Fast Float Source #
Instance details Defined in Data.Approximate.Numerics Methods flog :: Float -> Float Source # flog_lb :: Float -> Float Source # flog_ub :: Float -> Float Source # fexp :: Float -> Float Source # fexp_lb :: Float -> Float Source # fexp_ub :: Float -> Float Source # fpow :: Float -> Float -> Float Source # fpow_lb :: Float -> Float -> Float Source # fpow_ub :: Float -> Float -> Float Source #

Borchardt’s Algorithm from “Dead Reckoning: Calculating without instruments”.

This is a remarkably bad approximate logarithm.

flog had better outperform it! It is provided merely for comparison.