Hello,

I'd like to pass a column name as the argument for a function, but I'm
getting "NULL" as a return value.  Any suggestions?  Thanks.

> d <- data.frame(cbind(x=1, y=1:10))
> d
   x  y
1  1  1
2  1  2
3  1  3
4  1  4
5  1  5
6  1  6
7  1  7
8  1  8
9  1  9
10 1 10
> testing <- function(var) {
+ tst <- d$var[3]
+ tst
+ }
>
> dummy <- testing(y)
> dummy
NULL

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