[R] C++ to R : 64bit to 32bit problem.

[Thomas Lumley]

On Tue, 2 Jun 2009, H c wrote:

> Hi,
>
> I'm new to calling C++/C programs from R and am having some trouble getting
> started.  Following Sigal Blay (Simon Fraser University)'s instructions, I
> have a .c file called "useC1.c":
>
> /* useC1.c                */
>
> void useC(int *i) {
>    i[0] = 11;
> }
>
>
> This produces a .o file : "useC1.o" in a specified directory.  I then open
> R, set the proper directory and:
>
>
> dyn.load("useC1.o")

That's not what Sigal Blay's instructions say (if you mean 
http://www.sfu.ca/~sblay/R-C-interface.txt) They say
   dyn.load("useC1.so")

Now, that won't work either, because the correct extension under Windows 
is .dll rather than .so (look at .Platform to see the correct extension 
for your platform).

If you do
   dyn.load("useC1.dll")
the rest of the instructions should work.  They do for me on Vista.

 	-thomas

Thomas Lumley			Assoc. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle