[BioC] squaring each element of an expression set

[axel.klenk at actelion.com]

Hi Andrew,

I am not using oligo but if you have an ExpressionSet object xs
containing data on log2 scale, then the values on linear scale
will simply be

2^exprs(xs)

Note that this is exponentiation not squaring: 2^x and not x^2.

Cheers,

 - axel


Axel Klenk
Research Informatician
Actelion Pharmaceuticals Ltd / Gewerbestrasse 16 / CH-4123 Allschwil / 
Switzerland




From:
Andrew Einhorn <andreweinhorn at gmail.com>
To:
bioconductor at stat.math.ethz.ch
Date:
15.09.2010 09:03
Subject:
[BioC] squaring each element of an expression set
Sent by:
bioconductor-bounces at stat.math.ethz.ch



Using oligo to do rma, I end up with an expression set object whose 
elements
are in log2 space.  Is there some quick way to unlog (square) them to get
absolute intensity values back?

Andrew

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