R Error in x$ed : $ operator is invalid for atomic vectors

Question

Here is my code:

x<-c(1,2)
x
names(x)<- c(\"bob\",\"ed\")
x$ed

Why do I get the following error?

Error in x$ed

Answer 1

Atomic collections are accessible by $

Recursive collections are not. Rather the [[ ]] is used

 Browse[1]> is.atomic(list())
 [1] FALSE

 Browse[1]> is.atomic(data.frame())
 [1] FALSE

 Browse[1]> is.atomic(class(list(foo="bar")))
 [1] TRUE

 Browse[1]> is.atomic(c(" lang "))
 [1] TRUE

R can be funny sometimes

 a = list(1,2,3)
 b = data.frame(a)
 d = rbind("?",c(b))
 e = exp(1)
 f = list(d)
 print(data.frame(c(list(f,e))))

   X1 X2 X3 X2.71828182845905
 1  ?  ?  ?          2.718282
 2  1  2  3          2.718282