[BioC] Filtering by fold change

[Kasper Daniel Hansen]

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