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...chsutherland.com/Rtools/ and readme.packages. I was able to successfully execute the C program that is part of this package when compiling it using Microsoft visual studio. However, when I now try to create the R package with the command "Rcmd INSTALL test" I obtain the following: C:\Rdevelop>Rcmd INSTALL test ---------- Making package test ------------ adding build stamp to DESCRIPTION making DLL ... making test.d from test.c gcc -Ic:/R/rw2000/include -Wall -O2 -I"C:\Program Files\Numerical Algorithms Group\CLW3207DA\include" -c test.c -o test.o ar cr test.a test...

Dear Rdevelopers The background for this email is that I was helping a PhD student to improve the speed of her R code. I suggested to replace calls like t(AA)%*% BB by crossprod(AA,BB) since I expected this to be faster. The surprising result to me was that this change actually made her code slower. >...

...e test() C >routine. > >Here is the code included in the test.def that I placed in the \src >directory: > >LIBRARY test >EXPORTS > test > >After doing so I was able to successfully build, install and use the R >package that I called "test": > >C:\Rdevelop>Rcmd INSTALL test > > >---------- Making package test ------------ > adding build stamp to DESCRIPTION > running src/Makefile.win ... >cl /MT /Ox /D "WIN32" /c -I"C:\Program Files\Numerical Algorithms >Group\CLW3207DA\include" test.c >Microsoft (R)...

...n error message suggesting that it could not find the test() C routine. Here is the code included in the test.def that I placed in the \src directory: LIBRARY test EXPORTS test After doing so I was able to successfully build, install and use the R package that I called "test": C:\Rdevelop>Rcmd INSTALL test ---------- Making package test ------------ adding build stamp to DESCRIPTION running src/Makefile.win ... cl /MT /Ox /D "WIN32" /c -I"C:\Program Files\Numerical Algorithms Group\CLW3207DA\include" test.c Microsoft (R) 32-bit C/C++ Optimizing Compile...