Hello list.

I would like to return the affymetrix probe ids for a list of genes. Normally I would do this through biomaRt but the service is down all weekend.

I know the probe ids can be returned one at a time using regular expressions via

>library(hgu133plus2)
>symbols<-unlist(as.list(hgu133plus2SYMBOLS))
>gene1<-grep('^COPA$', symbols)
>symbols[gene1]

but I was wondering if there was a way to loop through the list of genes and 'grep' each one individually.

Thanks for any advice.

Iain

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