...in addition, I would definitely look at Bioconductor if you are doing this kind of research.
Paul On 09/14/2011 06:40 AM, Rolf Turner wrote: > On 14/09/11 17:49, anand m t wrote: >> Hi all, >> >> I'm analyzing micro array data.. it has produced a file (to be specific >> matrix) withdimension of 35556 2. >> first few lines of the matrix are as below.. >> >> probe_name control.fdr.pvals.present >> 10338001 0.000440001 >> 10338002 0.000583093 >> 10338003 0.000528449 >> 10338004 0.000610362 >> 10338005 0.000151825 >> 10338006 0.0001733 >> 10338007 0.000152924 >> >> Now, i want only rows whose "control.fdr.pvals.present" values are below >> 0.01. >> How do i that?? Please help me soon... > > Your question indicates that your knowledge of R is very limited. > If you are going to analyze micro array data in R, it behoves you > to learn some R. Read, mark, and inwardly digest ``An Introduction > to R'' (under "Manuals" on the R web page, www.r-project.org). > At the very least. > > To answer your question: If your matrix is named "m" then > > m[m[,2] <= 0.01,] > > gives you what you want. Possibly more perspicuously: > > ind <- m[,2] <= 0.01 # ind is a logical vector of length = nrow(m) > m[ind,] # This selects those rows of m where ind is TRUE > > cheers, > > Rolf Turner > > ______________________________________________ > 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. -- Paul Hiemstra, Ph.D. Global Climate Division Royal Netherlands Meteorological Institute (KNMI) Wilhelminalaan 10 | 3732 GK | De Bilt | Kamer B 3.39 P.O. Box 201 | 3730 AE | De Bilt tel: +31 30 2206 494 http://intamap.geo.uu.nl/~paul http://nl.linkedin.com/pub/paul-hiemstra/20/30b/770 ______________________________________________ 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.
