Hi Xiaoyue, You can subset a LumiBatch object in the same way as the matrix. For example x.lumi[,2:4] will subset the samples from 2 to 4. If you want to rename of samples, you can try the command like following: sampleNames(x.lumi) <- newNames All these functions are inherited from ExpressionSet Class. Tell me if you have any questions Pan On 12/21/07 12:19 PM, "Zhao, Xiaoyue" <zhaox at="" cshl.edu=""> wrote: > > Hi Pan, > > I'm using your lumi package. Can I ask a few questions? > > How to do MAplot or pair plot only for a subset of arrays? I have a lot of > arrays in the LumiBatch, and the graph is too small if I plot all the arrays. > > Another question is about the sample ID and label. I want to change the name > for each array in LumiBatch. How can I do that? > > Thanks a lot! > Xiaoyue >