[R] Updating DataFrame with Function

[BostonR]

This should be very simple but I am wrestling with updating a data frame from
within a function.  Here is a simple example:
### SET UP DATA FRAME
> tFrame <- data.frame(T=c(1:5))
> 
> tFrame
  T
1 1
2 2
3 3
4 4
5 5
> 
##### Simple function that updates with 1000
> tUpdate<- function (x){
+ tFrame$T[x] <- 1000
+ }
> tUpdate(5)
> tFrame
############# Update within function fails
  T
1 1
2 2
3 3
4 4
5 5
> 
######## Update dataframe outside function with 100
> tFrame[5,1] <- 100
> tFrame
    T
1   1
2   2
3   3
4   4
5 100
> 

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