[R] "missings=function(x) x[x==998|x==999]<-NA" doesn't work...

[Doreen Mueller]

Hi!

I want to have a function that assigns NAs to certain values of my 
variable "var" in the dataset "d". This doesn't work:

> missings=function(x) x[x==998|x==999]<-NA
> missings(d$var)
> table(d$var, useNA="always")

    0      1  999 <NA> 
 220  752  321 5264 

I don't get any error messages, but "d$var" remains unchanged. The 
function:
> missings=function(x) x[x==90|x==99]<<-NA
doesn't work either, and I read that "<<-" is "dangerous" anyway?

It is important for me to work with variable names (and therefore with 
functions instead loops) because the number and order of variables in my 
dataset changes regularly.

Thank you,
Doreen
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