[R-pkg-devel] incomplete gamma function Fortran subroutine

[John P. Nolan]

As others have said, built-in function pgamma is a (normalized) version of the incomplete gamma function!   John

-----Original Message-----
From: R-package-devel <r-package-devel-bounces using r-project.org> On Behalf Of Wang, Zhu
Sent: Tuesday, July 21, 2020 2:16 PM
To: Ben Bolker <bbolker using gmail.com>; r-package-devel using r-project.org
Subject: Re: [R-pkg-devel] incomplete gamma function Fortran subroutine

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Sorry for not making myself clear: The Fortran subroutine in an R package needs to call incomplete gamma function.

-----Original Message-----
From: R-package-devel <r-package-devel-bounces using r-project.org> On Behalf Of Ben Bolker
Sent: Tuesday, July 21, 2020 12:54 PM
To: r-package-devel using r-project.org
Subject: Re: [R-pkg-devel] incomplete gamma function Fortran subroutine

     Is there a reason not to use pgamma(), possibly adjusted by a (de-)normalizing constant?   (See detailed notes in ?pgamma)

On 7/21/20 1:44 PM, Wang, Zhu wrote:
> Hello,
>
> In an R function within a package, I would like to call a Fortran subroutine to compute lower gamma function. Any advice will be appreciated.
>
> Thanks!
>
> Zhu Wang
>
>       [[alternative HTML version deleted]]
>
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