Try this:
X<-c("A","B","C","D","E")
Y<-c(0,1,2,3,4)
for (i in 0:3) {
Y<-Y+i
data<-data.frame(X,Y)
fe.flag <- file.exists("test.csv")
write.table(data, "test.csv", row.names = FALSE, col.names = !fe.flag,
sep=";", append = fe.flag)
}
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