[BioC] Duplicated Gene IDs - averaging

[mjonczyk]

Dear List Members,

I have problem with ExpressionSet object. I've constructed such an 
object with data with
duplicated gene Ids (after assigment of probes IDs to genes).
I know that ExpressionSet doesn't support such a situation, but I've 
thought that function
poe.mcmc from metaArray package will handle it without problems - 
unfortunately,
after few hours of computing I've had an error.

So I'd like to ask how can I compute an average or -better- median for 
duplicated IDs in
exprs() slot in ExpressionSet object. Or just for matrix, so I could 
set it as an exprs().
I suspect it's basic function in R, but I've spent all day searching it 
and I haven't succeeded.
I'd also prefer not to convert ExpressionSet to another data type (e.g. 
MAList, RGList)
in order to perform such an operation.

Any help will be valuable,
Best Regards

-- 
Maciej Jonczyk,
Department of Plant Molecular Ecophysiology
Institute of Plant Experimental Biology
Faculty of Biology, University of Warsaw
02-096 Warszawa, Miecznikowa 1



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