Hi Immanuel, Could you tell me the code you are trying to run and the error you receive please? That way I will be able to diagnose the problem. Also, can I see the output of sessionInfo() so I know what version of the package you have? If you are trying to write an ExpressionSetIllumina object directly to a text file, then it will not work. Using something like: write.csv(exprs(BSData.normalised),file="NormalisedData.csv") should be fine though if you just want the expression values. Regards, Mark On Mon, 2007-05-14 at 15:09 +0200, Immanuel Rode wrote: > Hi Mark, > > > I?m still using beadarray for the analysis of my Illumina data. When I want > to write my normalized data to file R returns an error and I have no idea > how to force R to save my normalized data ;-). Can you tell me how I could > manage to save the normalized data as a txt file? > > Regards > > Immanuel