[BioC] ENTREZ identifiers for PGSEA

[Sebastien Gerega]

Hi,
I would like to use a lumi expression set with the PGSEA package and GO 
to generate genesets. I understand that the identifiers used in the data 
matrix need to be the same as those used in the genesets. Therefore, 
since I am using the GO database I need to use the ENTREZ identifiers 
for my matrix. How can I go about doing this? Obviously I cannot have 
multiple rows with the same name so I will have to remove duplicates and 
should probably do so based on variance or something. Is there an 
elegant way to do what I need?
thanks,
Sebastien