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hi R,users Now I read a data from a txt file newdata<-read.table("1.txt") in the 1.txt ,there are several column shown as below 1 3 4 5 2 3 5 6 4 5 6 7 so when I want analysis the second column anadata<-newdata$V2 but my question I can not use some certain variable to indice the column? e.g cmn=2 anadata<-newdata$Vcmn how can I finish this command ?can anyone help me ? thank