Thank you very much, Julian. I got it. Best, Allen
On Nov 14, 2007 2:38 PM, Julian Burgos <[EMAIL PROTECTED]> wrote: > One way to do this is > > range(which(B[,2]==1)) > > Julian > > > affy snp wrote: > > Hello list, > > > > I read in a txt file using > > > > <B<-read.table(file="data.snp",header=TRUE,row.names=NULL) > > > > by specifying the row.names=NULL so that the rows are numbered. > > Below is an example after how the table looks like using > > <B[1:10,1:3] > > > > > > SNP Chromosome PhysicalPosition > > 1 SNP_A-1909444 1 7924293 > > 2 SNP_A-2237149 1 8173763 > > 3 SNP_A-4303947 1 8191853 > > 4 SNP_A-2236359 1 8323433 > > 5 SNP_A-2205441 1 8393263 > > 6 SNP_A-1909445 1 7924293 > > 7 SNP_A-2237146 2 8173763 > > 8 SNP_A-4303946 2 8191853 > > 9 SNP_A-2236357 2 8323433 > > 10 SNP_A-2205442 2 8393263 > > > > I am wondering if there is a way to return the start and end row numbers > > for a subset of rows. > > > > For example, If I specify B[,2]=1, I would like to get > > start=1 and end=6 > > > > if B[,2]=2, then start=7 and end=10 > > > > Is there any way in R to quickly do this? > > > > Thanks a bunch! > > > > Allen > > > > > ______________________________________________ > > 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. > > ______________________________________________ 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.