I have a problem when running LIMMA. I get the following error message: Error in grep(protectMetachar(allcnames[i]), text.to.search) : regular expression is invalid in this locale Calls: read.maimages -> read.columns -> grep The code is below: > library(limma) > > targets <-readTargets(file="Targets.txt") > RG <-read.maimages(targets$Filename, source="genepix",wt.fun=wtflags(weight=0,cutoff=-50)) Does anyone know how to fix this error? Thanks, D

Dear Daniel Daniel Fortin scripsit 23/02/11 00:50: > I have a problem when running LIMMA. I get the following error message: > Error in grep(protectMetachar(allcnames[i]), text.to.search) : > regular expression is invalid in this locale > Calls: read.maimages -> read.columns -> grep > > The code is below: > >> library(limma) >> >> targets<-readTargets(file="Targets.txt") >> RG<-read.maimages(targets$Filename, source="genepix",wt.fun=wtflags(weight=0,cutoff=-50)) > > Does anyone know how to fix this error? Likely your file Targets.txt (in particular, the column headers) contains special characters that upset grep. I'd try editing it and throwing out any characters that are not alphanumeric. If that does not help, please provide the output of sessionInfo() and the content of the file "Targets.txt". Best wishes Wolfgang Wolfgang Huber EMBL http://www.embl.de/research/units/genome_biology/huber