Hi, I am trying to index into the expression array using a geneName. gcrma_exp <- gcrma(affybatch) E <- exprs(gcrma_exp) E is a matrix with the names of rows as geneNames (ie. 203508_at" ). I would like to get an index of E using a specific name such as 203508_at. Would someone be able to show how to do this? Thanks, Lana [[alternative HTML version deleted]]

Hi, I am trying to index into the expression array using a geneName. gcrma_exp <- gcrma(affybatch) E <- exprs(gcrma_exp) E is a matrix with the names of rows as geneNames (ie. 203508_at" ). I would like to get an index of E using a specific name such as 203508_at. Would someone be able to show how to do this? Thanks, Lana [[alternative HTML version deleted]]

Lana, To get the index, do: which(rownames(E)=='203508_ad') You could also do: E['203508_at',] to get the row of E. Also, note that there are multiple ways of accessing data directly from an expression or affybatch object. Sean ----- Original Message ----- From: "Lana Schaffer" <schaffer@scripps.edu> To: <bioconductor@stat.math.ethz.ch> Sent: Tuesday, January 25, 2005 6:38 PM Subject: [BioC] indexing geneNames in exprs > Hi, > I am trying to index into the expression array using a geneName. > gcrma_exp <- gcrma(affybatch) > E <- exprs(gcrma_exp) > > E is a matrix with the names of rows as geneNames (ie. 203508_at" ). > I would like to get an index of E using a specific name such as 203508_at. > Would someone be able to show how to do this? > Thanks, > Lana > [[alternative HTML version deleted]] > > _______________________________________________ > Bioconductor mailing list > Bioconductor@stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/bioconductor >