Dear BioCs, I recently moved to a MacBook, and tried to run my usual microarray analysis scritps (which works perfectly at my old PC), but without success. 1) RG <- read.maimages(targets$FileName, columns = list(Rf = "F2 Mean", Gf = "F1 Mean", Rb = "B2 Median", Gb = "B1 Median"), source="genepix",sep="\t", annotation = c("Block", "Row", "Column", "ID", "Name"), wt.fun=f) Error in grep(protectMetachar(allcnames[i]), text.to.search) : invalid regular expression in this local 2) RG$genes <- readGAL ("name_of_the_file.gal") object of the type 'closure' not possible to divide in substes Any ideas? What am I missing? Thanks, Priscila -- Priscila Grynberg, D.Sc.- Bioinformatics Laboratório de Genética Bioquímica Universidade Federal de Minas Gerais Tel: +55 31 3409-2628 CV: http://lattes.cnpq.br/8808643075395963 [[alternative HTML version deleted]]