[BioC] squaring each element of an expression set

axel.klenk at actelion.com axel.klenk at actelion.com
Wed Sep 15 09:26:25 CEST 2010

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


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


 - axel

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

Andrew Einhorn <andreweinhorn at gmail.com>
bioconductor at stat.math.ethz.ch
15.09.2010 09:03
[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 
are in log2 space.  Is there some quick way to unlog (square) them to get
absolute intensity values back?


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