Error function

[Oliver Ruebenacker]

     Hello,

  Is the error function implemented somewhere in the standard Scala libraries?

  https://en.wikipedia.org/wiki/Error_function

  Thanks!

     Take care
     Oliver

--
IT Project Lead at PanGenX (http://www.pangenx.com)
The purpose is always improvement

[Simon Ochsenreither]

Hi Oliver,

no, but you might have a chance to find it in the various math libraries for Scala. Otherwise, you could also implement it yourself and contribute the code!

Be,

Simon

[Oliver Ruebenacker]

     Hello,

  There's a formula on Wikipedia with maximum error of 1.2e-7, which I think may be sufficient for my purpose, but not for a Scala standard library. Does any one have a better formula?

  Thanks!

     Take care
     Oliver

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[Jason Zaugg]

I would recommend to use Apache Commons Math:

> set libraryDependencies += "org.apache.commons" % "commons-math3" % "3.2"

[info] Defining root/*:library-dependencies

[info] The new value will be used by root/*:all-dependencies

[info] Reapplying settings...

[info] Set current project to root (in build file:/Users/jason/code/scratch1/)

> console-quick

[info] Updating {file:/Users/jason/code/scratch1/}root...

[info] Resolving org.apache.commons#commons-math3;3.2 ...

[info] Done updating.

[info] Starting scala interpreter...

[info]

Welcome to Scala version 2.9.2 (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_37).

Type in expressions to have them evaluated.

Type :help for more information.

scala> org.apache.commons.math3.special.Erf.erf(1.2)

res0: Double = 0.9103139782296353

-jason

[Rex Kerr]

I'd also recommend using Apache Commons Math.

I have an implementation that is about 10x faster and just as accurate, but I'm not yet ready to release it as it's part of a larger package that still requires work.  If you really require speed, I can consider releasing just this under some appropriate license.  (Whatever that means for code that is essentially, "I typed up some math in a programming language".)

  --Rex