Hi List.

I'm trying to use the simpleaffy pairwise.comparison procedure on two groups of arrays. The groups are defined in the phenoData slot under the heading 'group' and are indicated by numbers i.e. 1,1,2,2,2,3,3,3 etc.

If I try:

results<-pairwise.comparison(test, 'group',c(1,4))

where 'test' is an appropriate subset of the data I get the following error:

Error in validObject(.Object) : 
  invalid class "PairComp" object: 1: invalid object for slot "members" in class "PairComp": got class "numeric", should be or extend class "character"
invalid class "PairComp" object: 2: invalid object for slot "pData" in class "PairComp": got class "integer", should be or extend class "data.frame"

Is it possible to change the class of the 'group' indicators in my phenoData slot or is there another way to get around this problem?

Thanks

Iain


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