I assume that you are working in package MatrixCalc. Lets
say you have a matrix X. You can call the columns of X this way:
X[,1] for the first column
X[,2] for the second column
X[,3] for the third column
Etc.
So lets say that you want to add the first and third column,
then you would just do X[,1] + X[,3]
If you wanted to call that quantity later on, it might be helpful
to give it a name:
NewQ <- X[,1] + X[,3]
Good luck,Rita
On Wed, Jun 22, 2011 at 2:35 AM, Nabila Binte Zahur <nab...@nus.edu.sg> wrote:
> Dear Sirs/Madam,
>
> I am a beginner to R, and I am currently working on a data matrix which looks
> like this:
>
>> head(oligo)
>
> ko:K00001 ko:K00003 ko:K00005 ko:K00008 ko:K00009 ko:K00010 ko:K00012
> AAA 370 631 365 67
> 164 455 491
> KAA 603 1208 170 157 68
> 495 922
> NAA 60 110 10 7
> 44 51 94
> DAA 183 802 41 62 26
> 166 263
> CAA 58 12 58 1
> 1 23 8
> TAA 451 468 201 90 131
> 320 518
>
>
> For certain specific columns, I need to merge the columns in such a way that
> the elements get added together.
>
> For example, in order to merge the first and the second columns, my output
> for the first row shld be
>
> ko:K00001/ko:K00003
> AAA 1001 (i.e. 370+631)
> KAA 1811 (i.e. 603+1208)
>
>
> and so on for the whole column.
>
Rita ===================================== "If you think education is
expensive, try ignorance."--Derek Bok
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