? Hi Readers,
? I have a question.
? I have a large dataset and want to throw away columns that have the same
? value in the column itself and I want to know which column this was.
? For example
? > x<-data.frame(id=c(1,2,3), snp1=c("A","G",
? "G"),snp2=c("G","G","G"),snp3=c("G","G","A"))
? > x
? ? id snp1 snp2 snp3
? 1 ?1 ? ?A ? ?G ? ?G
? 2 ?2 ? ?G ? ?G ? ?G
? 3 ?3 ? ?G ? ?G ? ?A
? Now I want to know that snp2 in monomorphic (the same value for the column)
? and after I know which column it is I want to take these columns out.
? Thanks,
? Naomi
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