Hi Helpers. I am creating one wrapper VC++ dll for use some simple statistical functions like correlation/covariance for my college project. I have done the following: I have gone thru R-exts.pdf u r mentioning. I have follwed the steps gievn under topic "The R api: entry points for C code". I have done these things 1) Created vc++ simple dll project. 2)inclued <R.h> in the .cpp file. 3) added path <R_HOME>\src\include, <R_HOME>\src\R_ext\include in the user settiing include & path in advanced system settings 4) added R.dll in the project path. I dont have R.lib 5) from some wrapper function calling int i = do_seq(1, 1, 1, 1); function (do_seq is in export symbols in R.dll). Now it is not recoginising. So , guide me in first l how to use SEXP varaible, and make me run 1 functionality .pls Reply ASAP. * I will appreciate if I can chat with the person who has soln for my problem for 10-15 min to help me live.Pls contact me on rnassa123@yahoo.com rnassa@hotmail.com Rakesh Nassa [[alternative HTML version deleted]]