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

[Ben Bolker]

   Interesting.  It looks like the way to make use of this is to combine 
the information in section 6.7.1 ("Distribution functions", including 
pgamma ...) with section 6.6 "Calling C from Fortran and vice versa" ?

On 7/21/20 4:33 PM, luke-tierney using uiowa.edu wrote:
> 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]]
>>>
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