[Rd] calling fortran from C

[Charles C. Berry]

Lapack.c is loaded with examples.

Try

$ cd <R source dir>
$ grep "F77_CALL" ./src/modules/lapack/Lapack.c

Did you see

 	5.6 Calling C from FORTRAN and vice versa

in 'Writing R Extensions' ??



On Thu, 20 Oct 2005, James Bullard wrote:

>
> Hello, I had a question about calling some of R's fortran routines from C.
> Specifically, I would like to call: dqrfit from some C code which will be
> bundled as an R package. I was hoping someone knew of an example in some
> of R's code which does something like this (any fortran call from R's C
> would probably be a sufficient guide). So far I can only find locations
> where R calls the Fortran directly, but this is not an option for me.
>
> Also, I am trying to gauge the overhead of making this call, does anyone
> have any knowledge of whether there might be some non-trivial constant
> time penalty on making such a call.
>
> Thanks in advance, Jim
>
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>

Charles C. Berry                        (858) 534-2098
                                          Dept of Family/Preventive Medicine
E mailto:cberry at tajo.ucsd.edu	         UC San Diego
http://biostat.ucsd.edu/~cberry/         La Jolla, San Diego 92093-0717