From: mail@...
Date: 2014-09-16T23:14:15+00:00
Subject: [ruby-core:65070] [ruby-trunk - Feature #10225] [PATCH] *math.c: New method Math.normcdf

Issue #10225 has been updated by gogo tanaka.


@David MacMahon 

Actually I know that gem(how nice it is!), I'm disconsolate about a few people knowing that gem.

Even if Ruby/GSL is as strong as python's one, most of people(include me) don't use it.

As for numerical analysis, stability, accuracy or reliability are most important things.

In this respect, I believe that to provide such a feature "as official" is helpful.

Anyway, thank you for telling me that! 

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Feature #10225: [PATCH] *math.c: New method Math.normcdf 
https://bugs.ruby-lang.org/issues/10225#change-48937

* 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)


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