Ifelse function R

I am trying execute this code but getting result NA.

> node1<- paste0("train$", rule, collapse=" & ")
> node1
[1] "train$feat_11< 5.477 & train$feat_60< 4.687"
>x<-ifelse(node1,1,0)
[1] NA

Promt me please how i can use character vector in ifeelse function