Many thanks - this did the trick! (Well, besides deleting an erroneous comma in the third to last line;)).
Best, C. ________________________________ From: Gabor Grothendieck <[email protected]> Cc: "[email protected]" <[email protected]> Sent: Saturday, December 22, 2012 6:02 AM Subject: Re: [R] Parallel code using parLapply > Dear R-users > > I was running into problems with my R code trying to run clh sampling (clhs > package) in parallel mode (=on various data sets simultaneously). > > Here is the code (which I developed with some help:)): > ****************************************** > library("clhs") > library("snow") > a <- as.data.frame(replicate(1000, rnorm(20))) > b <- as.data.frame(replicate(1000, rnorm(20))) > c <- as.data.frame(replicate(1000, rnorm(20))) > d <- as.data.frame(replicate(1000, rnorm(20))) > abcd <- list(a, b, c, d) > cl <- makeCluster(4) > results <- parLapply(cl, > X = abcd, > FUN = function(i) { > clhs(x = i, size = round(nrow(i) / 5), iter = 2000, simple = FALSE) > }, > ) > stopCluster(cl) > ****************************************** > > Before running the last line, R is throwing an error: "Error in length(x) : > 'x' is missing". Any ideas what I am doing wrong and how to improve? > Loading clhs on the primary does not automatically load it on the workers. Try: clusterEvalQ(cl, library(clhs)) -- Statistics & Software Consulting GKX Group, GKX Associates Inc. tel: 1-877-GKX-GROUP email: ggrothendieck at gmail.com [[alternative HTML version deleted]]
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