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 yo .

	[[alternative HTML version deleted]]

