Hello, 

Im a first year PhD student in Sanger institute - just started working with bioconductor and encoutered problem while building a contrast matrix. I first made  the desing matrix:

> design<-model.matrix(~-1 + pData(eset)$days)
> colnames(design)<-levels(pData(eset)$days)
> colnames(design)
[1] "025days" "12days"  "16days"  "1days"   "2days"   "4days"   "8days"


Then attempted to make a contrast matrix:

> contr_matrix<-makeContrasts(1days-025days, 2days-025days, 4days-025days, 8days-025days, 12days-025days, 16days-025days, levels=design)

but it produces the following error message:

Error: syntax error, unexpected SYMBOL, expecting ',' in "contr_matrix<-makeContrasts(1days"

I would be very grateful if somebody could point out what the problem could be. I am using R-2.5.0 under Linux.

Thanks a lot!
Sergei


