Hello to everybody, i have a little problem with my dataset. Actually my data using pData(eset.irq.50) is like this: > eset.irq.50 ExpressionSet (storageMode: lockedEnvironment) assayData: 1227 features, 8 samples element names: exprs phenoData sampleNames: SHR-PUFA5.CEL, SHR-PUFA6.CEL, ..., WK-st2.CEL (8 total) varLabels and varMetadata description: sample: arbitrary numbering featureData featureNames: 1367555_at, 1367556_s_at, ..., 1399089_at (1227 total) fvarLabels and fvarMetadata description: none experimentData: use 'experimentData(object)' Annotation: rat2302 > pData(eset.irq.50) sample SHR-PUFA5.CEL 1 SHR-PUFA6.CEL 2 SHR-st7.CEL 3 SHR-st8.CEL 4 WK-PUFA3.CEL 5 WK-PUFA4.CEL 6 WK-st1.CEL 7 WK-st2.CEL 8 i would like to modify these data in order to obtain: > pData(eset.irq.50) ES TYPE SHR-PUFA5.CEL PUFA SHR SHR-PUFA6.CEL PUFA SHR SHR-st7.CEL ST SHR SHR-st8.CEL ST SHR WK-PUFA3.CEL PUFA WK WK-PUFA4.CEL PUFA WK WK-st1.CEL ST WK WK-st2.CEL ST WK in order to gave to me the possibility to perform factDesign analysis. Somebody can help me? BEST REGARDS. -- ----------------------------------------------------- Dr. Alberto Goldoni Bologna, Italy ----------------------------------------------------- [[alternative HTML version deleted]]