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 





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