[aroma.affymetrix] Is it correct to do analyze different expression data based on the same platform on the same time?

Hi Everyone, I kind of remember that it is difficult or not correct to analyze multiple datasets based on different array design like hgu133plus2 and HuEx-1_0-st-v2. So, I am wondering whether it is OK to pool different experiments together if they are based on the same array design, such as HuEx-

[aroma.affymetrix] FIRMAGene command

Hello, I have a question regarding FIRMAGene. Executing the FIRMAGene command I get the following error: >fg<-FIRMAGene(plm, idsToUse=u, cls=cls) Gathering/calculating residuals. Reading units. Error in if (any(units < 1)) stop("Argument 'units' contains non- positive indices.") : missing value whe