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Hi Zhu, There is nothing wrong with your code. Unfortunately the Ensembl servers are having problems today and we can't do queries. I mailed the Ensembl helpdesk a few hours ago and this was their response: "We are currently experiencing problems derived from a serious power failure in the region, we are working to restore our service, please bear with us." So we have to wait and see. This is the first time they have been down this long as far as I know. Cheers, Steffen Zhu, Dongxiao wrote: > 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 > > [[alternative HTML version deleted]] > > _______________________________________________ > Bioconductor mailing list > Bioconductor at stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/bioconductor > Search the archives: http://news.gmane.org/gmane.science.biology.informatics.conductor > >