Thanks to Ben and John. Perhaps the program should call pgamma in R
and pass the number to Fortran. Calling some Fortran subroutines
older than R can trigger concerns when submitting the package to the
CRAN.
Best,
Zhu
-----Original Message-----
From: John P. Nolan <jpno...@american.edu>
Sent: Tuesday, July 21, 2020 1:43 PM
To: Wang, Zhu <wan...@uthscsa.edu>; Ben Bolker <bbol...@gmail.com>;
r-package-devel@r-project.org
Subject: RE: [R-pkg-devel] incomplete gamma function Fortran subroutine
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-boun...@r-project.org> On
Behalf Of Wang, Zhu
Sent: Tuesday, July 21, 2020 2:16 PM
To: Ben Bolker <bbol...@gmail.com>; r-package-devel@r-project.org
Subject: Re: [R-pkg-devel] incomplete gamma function Fortran subroutine
External Email: Use caution with links and attachments.
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-boun...@r-project.org> On
Behalf Of Ben Bolker
Sent: Tuesday, July 21, 2020 12:54 PM
To: r-package-devel@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
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