[BioC] how to match matrix

Hao Liu liuha at umdnj.edu
Thu May 6 22:53:16 CEST 2004

I have a specific question in R to ask,

in my phenodata, sometimes two chip results are from the same patient, one
for primary cancer one for metastasis, I know I can do this to extract all
chip results from a specific tissue:

exprs(obj)[,which(pData(obj)[,2<or whatever number>]=="liver")]

I wonder if there is a way to get all samples from patients with paired
samples? I understand this can be done using a database but I think it will
be so helpful if I can just do this in R.




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