[R-pkg-devel] [External] Re: incomplete gamma function Fortran subroutine

[iuke-tier@ey m@iii@g oii uiow@@edu]

Looking at this section of WRE may help:

https://cran.r-project.org/doc/manuals/r-release/R-exts.html#Numerical-analysis-subroutines

Best,

luke

On Tue, 21 Jul 2020, Wang, Zhu wrote:

> 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 <jpnolan using american.edu>
> Sent: Tuesday, July 21, 2020 1:43 PM
> To: Wang, Zhu <wangz1 using uthscsa.edu>; Ben Bolker <bbolker using gmail.com>; r-package-devel using 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-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
>
> 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-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]]
>>
>> ______________________________________________
>> R-package-devel using r-project.org mailing list
>> https://urldefense.proofpoint.com/v2/url?u=https-3A__stat.ethz.ch_mail
>> man_listinfo_r-2Dpackage-2Ddevel&d=DwIGaQ&c=U0G0XJAMhEk_X0GAGzCL7Q&r=7
>> rQvU8hscCTWlvO-F5wI2-2eTiW40XI5qUKda0AnbG0&m=Y5sTjoEyQhEnvYqP-rmi1Pmvi
>> Z_5jj7ur9P8ujvLiBc&s=w0p6b_yBQ1jDH3amMKQGvmEKYJD-BAid_CphFO37yu0&e=
>
> ______________________________________________
> R-package-devel using r-project.org mailing list https://urldefense.proofpoint.com/v2/url?u=https-3A__stat.ethz.ch_mailman_listinfo_r-2Dpackage-2Ddevel&d=DwIGaQ&c=U0G0XJAMhEk_X0GAGzCL7Q&r=7rQvU8hscCTWlvO-F5wI2-2eTiW40XI5qUKda0AnbG0&m=Y5sTjoEyQhEnvYqP-rmi1PmviZ_5jj7ur9P8ujvLiBc&s=w0p6b_yBQ1jDH3amMKQGvmEKYJD-BAid_CphFO37yu0&e=
> ______________________________________________
> R-package-devel using r-project.org mailing list https://urldefense.proofpoint.com/v2/url?u=https-3A__stat.ethz.ch_mailman_listinfo_r-2Dpackage-2Ddevel&d=DwIGaQ&c=U0G0XJAMhEk_X0GAGzCL7Q&r=7rQvU8hscCTWlvO-F5wI2-2eTiW40XI5qUKda0AnbG0&m=Y5sTjoEyQhEnvYqP-rmi1PmviZ_5jj7ur9P8ujvLiBc&s=w0p6b_yBQ1jDH3amMKQGvmEKYJD-BAid_CphFO37yu0&e=
> ______________________________________________
> R-package-devel using r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-package-devel
>

-- 
Luke Tierney
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa                  Phone:             319-335-3386
Department of Statistics and        Fax:               319-335-3017
    Actuarial Science
241 Schaeffer Hall                  email:   luke-tierney using uiowa.edu
Iowa City, IA 52242                 WWW:  http://www.stat.uiowa.edu