Concatenate variable names (inside loop)

Question

In my data.frame I want to add automatically some variabeles inside a loop. For instance "abc_1", "abc_2", "abc_3".

data.frame:

x <- c(1,2,3)
y <- c(4,5,6)
test<- data.frame("V1"=x, "V2"=y)

formula to create new variables:

for (i in 1:3){
  paste("test$abc",i,sep="") <- 5
}

Maybe the loop isn't the best method, but ok. So on the left side of the formula in the loop I try to concatenate 3 variables based on the "i" and some text. But paste doesn't work. Anybody got a bether idea?

Perhaps you need [ or may be test[paste0("abc", 1:3)] <- 5 — akrun
– akrun, Commented Mar 5, 2016 at 17:47
Perfect, thanks! Still figuring out how and when to use brackets;) — JaimeBenito
– JaimeBenito, Commented Mar 5, 2016 at 17:53

akrun · Accepted Answer · 2016-03-05 17:54:40Z

1

We could do this without a for loop

test[paste0("abc", 1:3)] <- 5

answered Mar 5, 2016 at 17:54

akrun

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