Dear Professor, thank you very much your suggestion. Yes, the real problem is the speed. I will check and try to understand how to use that R package, although it seems that it requires some knowledge of C++.
Thank you very much once again, gul > The only reason to use one of the apply family of functions is because the > idiom makes your code more clear. I do not see how that would be the case > here. The apply functions are not typically any faster. If you really need > speed the Rcpp package is very easy to use. > > Mark > On Aug 23, 2013, at 3:33 PM, gi...@metu.edu.tr wrote: > >> >> >> Dear R users, >> >> I am confused with the usage of apply kind of functions instead of >> nested >> loops. Let me illustrate my problem, I have an array,named C, with >> dimesions c(nr,nr,nt*n). I want to fill in a Tmat array according to the >> rule as given below: >> >> Tmat<-array(diag(nt*nr), c(nt*nr,nt*nr,n)) >> >> for( i in 1:n) { >> for( t in 2:nt) { >> Tmat[(2*t-1):(2*t),(2*t-3):(2*t-2),i]<-C[,,(i*t)] >> } >> } >> >> Instead of using two for loops, I want to use any apply kind of >> function, >> but I couldn't figure it out. At this point, any help will be >> appreciated. >> Thank you very much for your interest. >> >> >> gul >> >> ______________________________________________ >> 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. > > ______________________________________________ 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.