Hi,
Does anyone know where to find a Ruby /inverse/ error function?^1
Thanks,
Bil kleb
[1] See for example Error function - Wikipedia
Hi,
Does anyone know where to find a Ruby /inverse/ error function?^1
Bil kleb
[1] See for example Error function - Wikipedia
-------- Original-Nachricht --------
Datum: Sat, 14 Jun 2008 10:04:25 +0900
Von: Bil K. [email protected]
An: [email protected]
Betreff: Math::erfinv inverse error function
Hi,
Does anyone know where to find a Ruby /inverse/ error function?^1
Thanks,
Bil kleb
http://fun3d.larc.nasa.gov[1] See for example Error function - Wikipedia
Dear Bill,
you can use Shin-ichiro Hara’s statistics2 package
http://raa.ruby-lang.org/project/statistics2/ .
It has functions for calculating the integral of the Normal Function and
its inverse, and then there
is the following relation from the Wikipedia article you cited:
The inverse of \Phi, is known as the normal quantile function, or probit function and may be >>expressed in terms of the inverse error function as
\operatorname{probit}(p) = \Phi^{-1}(p) = \sqrt{2},\operatorname{erf}^{-1}(2p-1) = -\sqrt{2},\operatorname{erfc}^{-1}(2p).
Another option would be to use the rsruby interface to the R statistical
language.
http://rubyforge.org/projects/rsruby/
http://www.r-project.org/
Best regards,
Axel
Axel E. wrote:
you can use Shin-ichiro Hara’s statistics2 package
Excellent; thanks.
Another option would be to use the rsruby interface to the R statistical language.
Unfortunately, I’ve never managed to get R installed on
my OS X box. I haven’t honestly tried harder than sudo
port install.
Thanks again,
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