[BioC] help with affy annotation

[Katie]

Hi,

I am currently trying to annotate affy data and export it to a HTML file. I'm
having problems with the following codes:

library(multtest)
class <- as.integer(pData(Gds2609)$covar1) – 1
teststat <- mt.teststat(exprs(Gds2609), class)
index <- order(abs(teststat), decreasing = TRUE)
probeids <- featureNames(Gds2609)[index]

I get error warning messages when I do class and when I try to do teststat R
stops working. Any help that anyone could give me would be gratefully received.

Best Wishes,

Katie