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...I have been using them for a while on earlier versions of R, so didn't expect to have any problems. I am probably going about this the wrong way? I simply used R CMD build mypkgdir and then R CMD install mypkgdir.tar.gz the package installs without any error messages. however, library(mypkgname) still generates spiteful Error in library(mypkgname) : 'mypkgname' is not a valid package -- installed < 2.0.0? messages. My apologies if answers to this kind of question have already been posted. I have looked over the archived r-help threads for the last couple of months. Bes...

Function/file names are hypothetical. Say I have written myfunction.R, which calls myfunction.c via .C("myfunction", ...). I've compiled successfully myfunction.c via R CMD SHLIB myfunction.c in the terminal. Then, in the R console: dyn.load("myfunction.so") source("myfunction.R") test <- myfunction() # works fine So everything is in order, myfunction works