Hi succesfully imported pDAta but when i try the following commands i get a problem ??? any idea ?? > head(pData(phenoData)) Group patient1.r1 1 patient18.r1 1 patient16.r1 1 patient15.r1 1 patient14.r1 1 patient13.r1 1 > head(pData(phenoData$Group) == 1 ) Error in function (classes, fdef, mtable) : unable to find an inherited method for function "pData", for signature "integer" > > sapply(pData,class) Group "integer" > is.numeric(pData$Group) [1] TRUE Any idea why this is happening ??? using R 2.10 with bioconductor 2.5 under linux

On Dec 2, 2009, at 9:19 AM, David martin wrote: > > head(pData(phenoData$Group) == 1 ) Looking at this statement, it makes no sense. Specifically pData(phenoData$Group) should be either pData(phenoData)$Group or phenoData$Group Please study the expressions to see the difference. Kasper