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Issue #10225 has been updated by David MacMahon.
FWIW, the Ruby/GSL gem already provides support for this (and many other things):
```
$ ruby -r gsl -e 'p GSL::Cdf::gaussian_P(1)'
0.8413447460685429
```
On Sep 10, 2014, at 11:26 PM, mail / tanakakazuki.com wrote:
> Issue #10225 has been reported by gogo tanaka.
>
> ----------------------------------------
> Feature #10225: [PATCH] *math.c: New method Math.normcdf
> https://bugs.ruby-lang.org/issues/10225
>
> * Author: gogo tanaka
> * Status: Open
> * Priority: Normal
> * Assignee:
> * Category:
> * Target version:
> ----------------------------------------
> I know it looks kind of arbitrary or unnecessary feature ,but I believe that
>
> to provide such a feature as official is helpful to make people we couldn't reach so far have interest in Ruby.
>
> (Actually only this feature is not enough to do that..)
>
> By the way I still wonder whether naming method make sense.
>
> Debating between ...
>
> ```
> Math::pnorm -> R language use this
> Math::phi -> Euler's totient function is more popular as phi,
> Math::ncdf
> Math::guesscdf
> Math::cdf_of_norm,
> Math::cdf_of_guess
> ```
>
> Finally I come to the conclusion Math::normcdf is most proper length, meaning and has no other worries.
>
> ---Files--------------------------------
> _ math.c New method Math.normcdf.PATCH (1.04 KB)
> _ test_math.rb Add tests for Math.normcdf.PATCH (609 Bytes)
> _ NEWS About Math.normcdf.PATCH (488 Bytes)
>
>
> --
> https://bugs.ruby-lang.org/
----------------------------------------
Feature #10225: [PATCH] *math.c: New method Math.normcdf
https://bugs.ruby-lang.org/issues/10225#change-48855
* Author: gogo tanaka
* Status: Open
* Priority: Normal
* Assignee:
* Category: math
* Target version: current: 2.2.0
----------------------------------------
I know it looks kind of arbitrary or unnecessary feature ,but I believe that
to provide such a feature as official is helpful to make people we couldn't reach so far have interest in Ruby.
(Actually only this feature is not enough to do that..)
By the way I still wonder whether naming method make sense.
Debating between ...
```
Math::pnorm -> R language use this
Math::phi -> Euler's totient function is more popular as phi,
Math::ncdf
Math::guesscdf
Math::cdf_of_norm,
Math::cdf_of_guess
```
Finally I come to the conclusion Math::normcdf is most proper length, meaning and has no other worries.
---Files--------------------------------
_ math.c New method Math.normcdf.PATCH (1.04 KB)
_ test_math.rb Add tests for Math.normcdf.PATCH (609 Bytes)
_ NEWS About Math.normcdf.PATCH (488 Bytes)
--
https://bugs.ruby-lang.org/