I didn't find it until I said "before I compose a snarky reply to the
list I'd better search for "Fortran" through *all* of WRE to make sure
it's not there somewhere ..."
On 7/21/20 5:01 PM, Wang, Zhu wrote:
Indeed, that is the piece I missed completely! Glad that I didn't try to invent
wheels.
Thanks,
Zhu
-----Original Message-----
From: Ben Bolker <[email protected]>
Sent: Tuesday, July 21, 2020 3:58 PM
To: [email protected]; Wang, Zhu <[email protected]>
Cc: John P. Nolan <[email protected]>; [email protected]
Subject: Re: [External] Re: [R-pkg-devel] incomplete gamma function Fortran
subroutine
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, [email protected] 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 <[email protected]>
Sent: Tuesday, July 21, 2020 1:43 PM
To: Wang, Zhu <[email protected]>; Ben Bolker <[email protected]>;
[email protected]
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 <[email protected]> On
Behalf Of Wang, Zhu
Sent: Tuesday, July 21, 2020 2:16 PM
To: Ben Bolker <[email protected]>; [email protected]
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 <[email protected]> On
Behalf Of Ben Bolker
Sent: Tuesday, July 21, 2020 12:54 PM
To: [email protected]
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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