[Rd] calling fortran from C

[Liaw, Andy]

This is in R-exts.  If the Fortran subroutine is called `dqrfit', you would
use something like:

F77_CALL(dqrfit)(...);

All arguments need to be pointers, as Fortran passes by reference.

Andy

> From: James Bullard
> 
> 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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