Thanks so much Rui. I really appreciate all the help.
I implemented the code and it ran fine. I was wondering how I could include the
probeset ids as probeset1:probeset2 in the final output so that I know which
ratios are for which probeset pairs.
Thanks so much.
Som.
Date: Sat, 12 May 2012 09:29:54 -0700
From: ml-node+s789695n4629105...@n4.nabble.com
To: genome1...@hotmail.com
Subject: Re: Calculating all possible ratios
Hello,
If by all possible gene ratios you mean all pairwise column ratios, try
the following.
# Make up some data
x <- matrix(1:24, ncol=6)
cmb <- combn(ncol(x), 2)
r1 <- apply(cmb, 2, function(j) x[, j[1]]/x[, j[2]])
r2 <- apply(cmb, 2, function(j) x[, j[2]]/x[, j[1]])
cbind(r1, r2)
Note that the dataset must be a numeric only matrix or data.frame.
Hope this helps,
Rui Barradas
Em 12-05-2012 11:00, [hidden email] escreveu:
> Date: Fri, 11 May 2012 12:39:23 -0700 (PDT)
> From: genome1976<[hidden email]>
> To:[hidden email]
> Subject: [R] Calculating all possible ratios
> Message-ID:<[hidden email]>
> Content-Type: text/plain
>
> I have a data matrix with genes as columns and samples as rows. I want to
> create all possible gene ratios.Is there an elegant and fast way to do it in
> R and write it to a dataframe?
>
> Thanks for any help.
> Som.
>
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>
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