[BioC] SpikeIn and rma, MAS5 and dChip

[Mohammad Esad-Djou]

Hello, 

I would like to make simple test with SpikeIn: (like Dilution)

library(affy)
library(affydata)
data(SpikeIn)

myprobesets <- geneNames(SpikeIn)[1:12]

eset <- rma(SpikeIn,subset=myprobesets)

but I get error message:
>myprobesets <- geneNames(SpikeIn)[1:12]
Error in geneNames(SpikeIn) : No direct or inherited method for function "geneNames" for this call

which difference between Dilution and SpikeIn gives? How can I use MAS5, RMA and dChip for SpikeIn?

Thanks,
Mohammad Esad-Djou