Hi All, I have two questions on R. Could you please explain them to me? Thank you!
1) When call a function, R typically copys the values to formal arguments (call by value). This is very cost, if I would like to pass a huge data set to a function. Is there any situations that R doesn't copy the data, besides pass data in an environment object.
2) Does R pre-compile the object function to binary when running "optim"? I experienced the R "optim" is much slower than the MATLAB "fmincon" function. I don't know MATLAB has done any pre-compilation on the script for object function or not. But perhaps, we can increase R performance by some sort of pre-compilation during running time.
Thanks in advance. Best Regards, Ruihong
______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
