"James Bullard" <[EMAIL PROTECTED]> writes: > 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
The penalty is no bigger than on ordinary C calls. The main issue is to get the naming convention right (HAVE_F77_UNDERSCORE, etc) and call dqrfit_(....) if required -- all in a portable way. The whole thing is described in the Writing R Extensions manual, section 5.6 specifically. -- O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
