On 11/8/2012 9:14 AM, Martin Morgan wrote: > On 11/08/2012 06:02 AM, James W. MacDonald wrote: >> Hi Priya, >> >> On 11/8/2012 3:25 AM, priya [guest] wrote: >>> I have a matrix in the following way : >>> >>> probes p1 p2 p3 p4 p5 >>> >>> 244971 5 6 7 8 9 >>> 244972 8 7 9 7 8 >>> 244973 4 3 2 6 7 >>> 244973 8 5 3 6 8 >>> >>> I would like to extract only the probe names and tried this: >>> degtl - original matrix( containing 22810 entries) >>> >>> >>> ids<- degtl[,1] >>> >>> and I got >>> head(ids) >>> [1] 244941_at 244959_s_at 244974_at 245009_at 245024_at >>> 245028_at >>> 22810 Levels: 244901_at 244902_at 244903_at 244904_at 244905_at >>> 244906_at >>> 244907_at 244908_at ... AFFX-TrpnX-M_at. >>> >>> I would like to extract the probe names as a vector in the >>> following form : >> >> Right. Well, this doesn't have anything to do with Bioconductor, and >> in fact is >> a very rudimentary thing to do in R. So I wouldn't even suggest >> asking on >> R-help. Although you could try, if you are up for a bit of public >> shaming. > > Actually, the question has been asked, in various forms, here at least > three times > > https://stat.ethz.ch/pipermail/bioconductor/2012-November/048943.html > https://stat.ethz.ch/pipermail/bioconductor/2012-November/049067.html > https://stat.ethz.ch/pipermail/bioconductor/2012-November/049096.html > > R once > > https://stat.ethz.ch/pipermail/r-help/2012-November/328389.html > > and I believe on StackOverflow! Well, that's a +1 for persistence! But probably a -Inf for self reliance. Jim > > Martin > >> >> Anyway you seem to be lacking very basic knowledge and asking >> rudimentary >> questions on a listserv is probably the least efficient way to learn >> things. >> Instead, may I suggest you do some reading? If you ever expect to go >> far with R >> (or any endeavor you might consider, now that I think about it) you >> will do well >> to figure out how to help yourself. >> >> If I were you, I would read 'An Introduction to R' >> http://cran.r-project.org/doc/manuals/R-intro.html. This goes over >> the basic >> data structures in R and shows how to manipulate them. >> >> Best, >> >> Jim >> >> >>> >>> ids<- c("244971","244972","244973",......) for all 22810 levels.Iam >>> unable to >>> do it and always end up with a list. >>> >>> >>> >>> -- output of sessionInfo(): >>> >>> R version 2.15 >>> Linux >>> >>> -- >>> Sent via the guest posting facility at bioconductor.org. >>> >>> _______________________________________________ >>> Bioconductor mailing list >>> Bioconductor at r-project.org >>> https://stat.ethz.ch/mailman/listinfo/bioconductor >>> Search the archives: >>> http://news.gmane.org/gmane.science.biology.informatics.conductor >> > > -- James W. MacDonald, M.S. Biostatistician University of Washington Environmental and Occupational Health Sciences 4225 Roosevelt Way NE, # 100 Seattle WA 98105-6099