Hi Joris, I guess i did it wrong again. but your example didn't work either. I still get the error massage.
but replicate function just fine. I can even replicate the whole array lines. THX Assa On Thu, Jul 8, 2010 at 15:20, Joris Meys <jorism...@gmail.com> wrote: > Don't know what exactly you're trying to do, but you make a matrix > with 11 columns and 50 rows, then treat it as a vector. On top of > that, you try to fill 50 rows/columns with 50 values. Off course that > doesn't work. Did you check the warning messages when running the > code? > > Either do : > > for(i in c(1:11)){ > set[,i] <-sample(x,50) > print(c(i,"->", set), quote = FALSE) > } > > or > > for(i in c(1:50)){ > set[i,] <-sample(x,11) > print(c(i,"->", set), quote = FALSE) > } > > Or just forget about the loop altogether and do : > > set <- replicate(11,sample(x,50)) > or > set <- t(replicate(50,sample(x,11))) > > cheers > > On Thu, Jul 8, 2010 at 8:04 AM, Assa Yeroslaviz <fry...@gmail.com> wrote: > > Hello R users, > > > > I'm trying to extract random samples from a big array I have. > > > > I have a data frame of over 40k lines and would like to produce around 50 > > random sample of around 200 lines each from this array. > > > > this is the matrix > > ID xxx_1c xxx__2c xxx__3c xxx__4c xxx__5T xxx__6T xxx__7T > xxx__8T > > yyy_1c yyy_1c _2c > > 1 A_512 2.150295 2.681759 2.177138 2.142790 2.115344 2.013047 > > 2.115634 2.189372 1.643328 1.563523 > > 2 A_134 12.832488 12.596373 12.882581 12.987091 11.956149 11.994779 > > 11.650336 11.995504 13.024494 12.776322 > > 3 A_152 2.063276 2.160961 2.067549 2.059732 2.656416 2.075775 > > 2.033982 2.111937 1.606340 1.548940 > > 4 A_163 9.570761 10.448615 9.432859 9.732615 10.354234 10.993279 > > 9.160038 9.104121 10.079177 9.828757 > > 5 A_184 3.574271 4.680859 4.517047 4.047096 3.623668 3.021356 > > 3.559434 3.156093 4.308437 4.045098 > > 6 A_199 7.593952 7.454087 7.513013 7.449552 7.345718 7.367068 > > 7.410085 7.022582 7.668616 7.953706 > > ... > > > > I tried to do it with a for loop: > > > > genelist <- read.delim("/user/R/raw_data.txt") > > rownames(genelist) <- genelist[,1] > > genes <- rownames(genelist) > > > > x <- 1:40000 > > set <- matrix(nrow = 50, ncol = 11) > > > > for(i in c(1:50)){ > > set[i] <-sample(x,50) > > print(c(i,"->", set), quote = FALSE) > > } > > > > which basically do the trick, but I just can't save the results outside > the > > loop. > > After having the random sets of lines it wasn't a problem to extract the > > line from the arrays using subset. > > > > genSet1 <-sample(x,50) > > random1 <- genes %in% genSet1 > > subsetGenelist <- subset(genelist, random1) > > > > > > is there a different way of creating these random vectors or saving the > loop > > results outside tjhe loop so I cn work with them? > > > > Thanks a lot > > > > Assa > > > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > 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. > > > > > > -- > Joris Meys > Statistical consultant > > Ghent University > Faculty of Bioscience Engineering > Department of Applied mathematics, biometrics and process control > > tel : +32 9 264 59 87 > joris.m...@ugent.be > ------------------------------- > Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php > [[alternative HTML version deleted]] ______________________________________________ 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.