You should not have started with R/C API without reading this (first link in google): "Writing R Extensions". For your particular question you want pages 72+ and sections 5.9.3 and 5.9.4, possibly further as well
Dr Oleg Sklyar Research Technologist AHL / Man Investments Ltd +44 (0)20 7144 3107 [EMAIL PROTECTED] > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Wilm Schumacher > Sent: 24 November 2008 18:59 > To: r-devel@r-project.org > Subject: [Rd] handling a matrix and .C > > Hello R-devel, > > I want to write extensions for R in C (maybe C++ and Fortran > later) and it works fine, but there is one problem, which I > cannot solve (in my view). > > I want to handle a matrix from R in C. For arrays there is > "as.double(...)", but nothing for a matrix. > > I searched a while, but didn't find something. > > Last I looked at the source code of e1071 and of the core > itself and recognized (I hope I understood this), that you > (and the "e1071" people) use "as.double()" and give ".C" an > array and one have to "parse" the matrix again in the C function. > > This sounds a little complicate. Isn't there another way? A > more adapted way? > > Greetings > > Wilm > > ps: I joined the R-devel list, but didn't get an confirmation > mail. I hope this is normal > -- > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > ********************************************************************** Please consider the environment before printing this email or its attachments. The contents of this email are for the named addressees ...{{dropped:19}} ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
