Why do these two cases behave differently?
>substitute(c1<-100,list(c1=100))
100 <- 100
vs
> substitute(c1=100,list(c1=100))
[1] 100
views:
77answers:
2
+2
A:
Because the second expression interprets c1 = 100 as saying the argument named c1 of the function substitute should have value 100.
Jonathan Chang
2010-04-28 19:28:57
ok but even if I wrap it in I() it doesn't actually substitue it while for I(c1<-100) it does
frankc
2010-04-28 20:05:10
Why do you think `I()` would do anything here?
hadley
2010-04-29 00:38:00
+1
A:
As I understand help to assignOps operator = evaluates immediately. So the second expression is equivalent to substitute(100,list(c1=100)).
But you could take it in braces and the result is
> substitute({c1=100},list(c1=100))
{
100 = 100
}
Marek
2010-04-28 21:01:06