Hello everyone, 

I have a question of using biomaRt package to retriveve affy IDs from
entrez gene IDs. The following is my code but it returns nothing. Can
somebody help? Many thanks.

library(biomaRt)
ensembl = useMart("ensembl")
ensembl = useDataset("hsapiens_gene_ensembl",mart=ensembl)
hh.affy <- getBM(attributes= "affy_hg_u133a", filters= "entrezgene",
value = c("891", "983"), mart = ensembl)

Dongxiao Zhu

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