[R] if function and apply

[Gregor Gorjanc]

John Kane <jrkrideau <at> yahoo.ca> writes:
> I have a dataset just imported from SPSS.  It has any
> number of 99's as missing data and it looks like the
> next dataset will have custom missing codes. I have
> abouat 120 variables and an N of 2000.
> 
...
> 
> #  define function
> fn <- function (x a) {

you need comma between x and a i.e. (x, a)
                                      ^

> if (x==a)return  (b) else x
> }

How can you return b, if b was not defined before

Gregor