Was supposed to be: B <- A[,1:47] / myAvg
On Nov 12, 2007 3:10 PM, jim holtman <[EMAIL PROTECTED]> wrote: > Try something like this: > > myAvg <- rowMeans(A[,48:243]) > B <- A[1:47,] / myAvg > > > On Nov 12, 2007 1:37 PM, affy snp <[EMAIL PROTECTED]> wrote: > > Dear list, > > > > Hi! I have a table A, 238304 rows and 243 columns (representing > > samples). First of all, I would like to pool a group of samples > > from 48th column to 243rd column and take the average across > > them and make a single column,saying as the reference column. > > > > Second, I want to use each column of first 47 columns in table > > A divided by the reference column and end up with a new table > > B with 238304 rows and 47 columns. > > > > Is there any simple code which especially could do sth like > > reference_column<-(A[,48]+A[,49]+...A[,243])/196 > > and B<-A[,1:47]/reference_column? > > > > Thank you very much for your help! > > > > Best, > > 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. > > > > > > -- > Jim Holtman > Cincinnati, OH > +1 513 646 9390 > > What is the problem you are trying to solve? > -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem you are trying to solve? ______________________________________________ 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.