I know this is not a revolution support forum, but as anyone noticed the following?
I have a foreach loop to generate random samples. If I run the exact code below in normal r (2.14.1) it works as expected, but if I run it from revolution 4.2.0 each loop returns the same numbers. The only way I can get revolution to give different numbers is using 1 instead of 8 in registerDoSNOW(makeCluster(8, type = "SOCK")) but that seems to defeat the point. library(foreach) library(doSNOW) registerDoSNOW(makeCluster(8, type = "SOCK")) getDoParWorkers() getDoParName() getDoParVersion() mySamples <- foreach (jj = 1:4, .combine=cbind) %dopar% { return(sample(1:10,10,replace=TRUE)) } mySamples ########## r 2.14.1 ########## > library(foreach) > library(doSNOW) > registerDoSNOW(makeCluster(8, type = "SOCK")) > getDoParWorkers() [1] 8 > getDoParName() [1] "doSNOW" > getDoParVersion() [1] "1.0.6" > > > mySamples <- foreach (jj = 1:4, .combine=cbind) %dopar% { + return(sample(1:10,10,replace=TRUE)) + } > > mySamples result.1 result.2 result.3 result.4 [1,] 5 3 1 4 [2,] 1 10 10 3 [3,] 7 9 4 9 [4,] 2 5 9 3 [5,] 2 7 10 1 [6,] 7 8 10 10 [7,] 6 9 10 4 [8,] 8 6 6 2 [9,] 10 7 9 4 [10,] 2 4 1 9 > #################### # revolution r #################### > library(foreach) Loading required package: iterators Loading required package: codetools foreach: simple, scalable parallel programming from REvolution Computing Use REvolution R for scalability, fault tolerance and more. http://www.revolution-computing.com > library(doSNOW) Loading required package: snow > registerDoSNOW(makeCluster(8, type = "SOCK")) > getDoParWorkers() [1] 8 > getDoParName() [1] "doSNOW" > getDoParVersion() [1] "1.0.3" > > > mySamples <- foreach (jj = 1:4, .combine=cbind) %dopar% { + return(sample(1:10,10,replace=TRUE)) + } > > mySamples result.1 result.2 result.3 result.4 [1,] 4 4 4 4 [2,] 10 10 10 10 [3,] 4 4 4 4 [4,] 10 10 10 10 [5,] 5 5 5 5 [6,] 5 5 5 5 [7,] 9 9 9 9 [8,] 2 2 2 2 [9,] 6 6 6 6 [10,] 9 9 9 9 > -- View this message in context: http://r.789695.n4.nabble.com/revolution-foreach-oddity-tp4616237.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.