Patricia Bautista <[EMAIL PROTECTED]> writes: > Hi r-devel, > > I am working on a R extension. I am writing the > function in C++, and in my function it is required a R > function object from the user. This R function object > will be evaluated thousand of times in my C++ code. I > generated the shared library and I loaded it on R. I > did several experiments in order to compare the speed > of my compiled code vs the speed of the equivalent > interpreted code. I was surprise!, the better was the > interpreted code!. Then, I ask myself: What is the > benefit of compiled code??. I think my problem is in > using the function "eval(SEXP f, SEXP rho)" because it > takes time!. Am I right?. Then, can someone tell me > what the benefit of using compiled code is?, or can > someone give me a reference to look into?.
If you use eval in C you are doing effectively the same thing as at the interpreter (R) level. The benefit of doing computations in C comes from making direct calls to R's C API, avoiding duplication (copy of R objects), etc. + seth ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
