[R] How to pool a group of samples and take the ave.

[jim holtman]

Try something like this:

myAvg <- rowMeans(A[,48:243])
B <- A[1:47,] / myAvg

On Nov 12, 2007 1:37 PM, affy snp <affysnp at gmail.com> 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
>
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>



-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?