[BioC] Filtering by fold change

Kasper Daniel Hansen k.hansen at biostat.ku.dk
Mon Jun 28 18:36:39 CEST 2004

On Sun, Jun 27, 2004 at 09:19:33PM +0200, peter robinson wrote:
> Dear List,
> I guess this is a pretty basic question, but I have not found an answer in the 
> archives. I would like to take a matrix representing m hybridizations and 
> sort it to extract the 2000 genes with the maximal fold change as a 
> preliminary step of a further analysis. Is it possible to use the geneFilter 
> to extract a fixed number of the "top" genes as above rather than genes 
> satisfying some fixed criterion?

No. Genefilter operates on a gene-by-gene basis (at least when I last 
looked at the function). There are (of course) other ways of doing it.
Kasper Daniel Hansen, Research Assistant
Department of Biostatistics, University of Copenhagen

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