I want merge fit2 with a txt file I'll call MGL (mastergenelist) which contains gene id information.  I am using a custom cDNA array.  The reason is that I want the gene ID information along-side the rownames (which are the accession IDs).  Both have identical row names.  MGL has missing data.

I have tried:

MGLnew<-read.table(file="MGL.txt",sep="\t",header=TRUE,na.strings="",fill=TRUE)  #WORKS
write.table(MGLnew,file="MGLnew.txt",sep="\t") #WORKS
fit2<-merge(fit2,MGLnew,by="row.names")  #NOT WORKING

When I run this I get the following error message:

Error in dim(data) <- dim : attempt to set an attribute on NULL

What does this error message mean?  How do I fix the problem?

Sally Goldes

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