Dear Dirk,
I hope I did nothing wrong removing your address and <[email protected]> from the CC list. Am Donnerstag, den 28.07.2011, 17:25 -0500 schrieb Dirk Eddelbuettel: > On 28 July 2011 at 23:22, Paul Menzel wrote: > | Package: r-base > | Version: 2.13.1-1 > | Severity: important > | > | Dear Debian folks, > | > | > | The following command reliably freezes my system after one or two > | seconds and the only way to recover is to cold reset the system. > | > | > n = 10000 > | > length = 10000 > | > R = matrix(sample(c(-1,1),length*n,replace=T),nrow=n) > > Do you have 800mb free? Rule of thumb with R is that you need about 3 times > as much RAM as the largest object, so are you on a 4gb machine? No and no. The machine only has 2 GB of which the GNOME with Evolution and Epiphany takes the most (41 %). > | Trying this on a different system (totally different) running Debian > | Squeeze, i. e. R version 2.11.1-6, I get an error message though. > | > | > n = 10000 > | > length = 10000 > | > R = matrix(sample(c(-1,1),length*n,replace=T),nrow=n) > | Error: cannot allocate vector of size 762.9 Mb > | > | First I suspected RAM/memory problems because the RAM fills up pretty > | quickly, but Memtest86+ did not reveal any errors. Additionally I am > | still running `linux-image-2.6.32-5-amd64` (2.6.32-31) because of bug > | #613979, but that should not cause any problems. > | > | It would be great if you could advise me of how to continue to solve > | this problem. > > Get more ram, As replied to Douglas I am still pretty sure that my machine freezes, since the clock did not advance and the mouse pointer did not move at all. > or use a smaller problem. It works like a charm here (on a > "large" 64bit machine running 2.13.1): > > edd@.......:~$ r -e "n <- 10000; R <- > matrix(sample(c(-1L,1L),n*n,replace=T),nrow=n); print(dim(R))" > [1] 10000 10000 > edd@.......:~$ I guess, I have to abstain from using matrices and use a for loop over smaller matrices (or vectors). > (r is from the littler package) Thank you for telling me about `r`. This looks useful. […] Thanks, Paul
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