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.
Look in the lapack module, and also in the stats package for loess (and others, smooth.spline has both C and Fortran components). > 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. Not significant (and C to Fortran is normally no different from C to C). In this case you will be calling from a DLL either into an executable or a DLL and that will be slower than calling within a DLL, how much depending on the platform. -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
