[R] Problem with modifying a data frame

[SNN]

Hi All,

this could be a simple question but I am looking into modifying a data frame
using a "condition" without the need to loop over that data, would that be
possible?

I have tried the following 

> x<-c(4,5,6,6,8)
> y<-c("a","b","b","b","c")
> data<-data.frame(x,y)
> data
  x y
1 4 a
2 5 b
3 6 b
4 6 b
5 8 c
 if (data$x==6){
data$x<-66
}
Warning message:
In if (data$x == 6) { :
  the condition has length > 1 and only the first element will be used
> 

I woul dlike to change the 6 in column x into 66
why the above did not work?

Thanks 
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