Hi I am new to analyzing gpr files and I am getting an error in the first stage of reading them. Here is the code: > library(marray) > myfiles <- dir(pattern="gpr") > data<-read.GenePix(myfiles) where I get the error > Error in `[.data.frame`(dat, , name.Rf) : undefined columns selected I have also tried > library(limma) > myfiles <- dir(pattern="gpr") > RG <- read.maimages(myfiles, source="genepix") Where also I get the error > Error in `[.data.frame`(obj, , columns[[a]]) : undefined columns selected I tried to look for solution but couldn't find any except that the 'gpr files should be used as obtained from genepix'. I have only these files, is there any way to fix the files or find the cause of error. Thanks Konika Chawla PhD Student Department of Biology NTNU [[alternative HTML version deleted]]