You need to assign the output of missings() to something. For that
matter, missings() needs some output.
d <- data.frame(a=1:5, b=6:10, var=c(1, 1, 998, 999, 2))
missings <- function(x) {
x[x==998|x==999]<-NA
x
}
d$var <- missings(d$var)
> d
a b var
1 1 6 1
2 2 7 1
3 3 8 NA
4 4 9 NA
5 5 10 2
Sarah
On Thu, Sep 18, 2014 at 10:13 AM, Doreen Mueller <doreen.muel...@dza.de> wrote:
> 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
--
Sarah Goslee
http://www.functionaldiversity.org
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