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add logBase #28

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9 changes: 9 additions & 0 deletions src/Data/Number.purs
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@ module Data.Number
, exp
, floor
, log
, logBase
, max
, min
, pow
Expand All @@ -36,6 +37,7 @@ module Data.Number
, tau
) where

import Data.EuclideanRing ((/))
import Data.Function.Uncurried (Fn4, runFn4)
import Data.Maybe (Maybe(..))

Expand Down Expand Up @@ -190,6 +192,13 @@ foreign import floor :: Number -> Number
-- | 1.0
foreign import log :: Number -> Number

-- | Returns the logarithm of a number with a given base
-- | ```purs
-- | > logBase 2.0 8.0
-- | 3.0
logBase :: Number -> Number -> Number
logBase base number = log number / log base

-- | Returns the largest of two numbers. Unlike `max` in Data.Ord this version
-- | returns NaN if either argument is NaN.
foreign import max :: Number -> Number -> Number
Expand Down