Dear Jim, Thank you very much for your response. It seems to work now, but the return value is not the required matrix but a list of matrices (one for each repition j). Any idea how it is possible to return only the last matrix and not all?
Thanks and best, Martin Gesendet: Freitag, 31. Juli 2015 um 18:22 Uhr Von: "jim holtman" <jholt...@gmail.com> An: "Martin Spindler" <martin.spind...@gmx.de> Cc: "r-help@r-project.org" <r-help@r-project.org> Betreff: Re: [R] R parallel / foreach - aggregation of results Try this chance to actually return values: library(doParallel) Simpar3 <- function(n1) { L2distance <- matrix(NA, ncol=n1, nrow=n1) data <- rnorm(n1) diag(L2distance)=0 cl <- makeCluster(4) registerDoParallel(cl) x <- foreach(j=1:n1) %dopar% { library(np) datj <- data[j] for(k in j:n1) { L2distance[j,k] <- k*datj } L2distance # return the value } stopCluster(cl) return(x) } Res <- Simpar3(100) Jim Holtman Data Munger Guru What is the problem that you are trying to solve? Tell me what you want to do, not how you want to do it. On Fri, Jul 31, 2015 at 8:39 AM, Martin Spindler <martin.spind...@gmx.de> wrote:Dear all, when I am running the code attached below, it seems that no results are returned, only the predefined NAs. What mistake do I make? Any comments and help is highly appreciated. Thanks and best, Martin Simpar3 <- function(n1) { L2distance <- matrix(NA, ncol=n1, nrow=n1) data <- rnorm(n1) diag(L2distance)=0 cl <- makeCluster(4) registerDoParallel(cl) foreach(j=1:n1) %dopar% { library(np) datj <- data[j] for(k in j:n1) { L2distance[j,k] <- k*datj } } stopCluster(cl) return(L2distance) } Res <- Simpar3(100) ______________________________________________ R-help@r-project.org[R-help@r-project.org] mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help[https://stat.ethz.ch/mailman/listinfo/r-help] PLEASE do read the posting guide http://www.R-project.org/posting-guide.html[http://www.R-project.org/posting-guide.html] and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.