[R] if + is.na

[Rolf Turner]

On 15/06/2009, at 7:48 AM, Grześ wrote:

>
> Hello!
> I wont to use a function is.na()
>
> I have  two vectors:
>>  a=c(1,NA,3,3,3)
>>  b=c(0,0,0,0,0)
> and when I use is.na function it's ok:
>> is.na(a)
> [1] FALSE  TRUE FALSE FALSE FALSE
>
> but I would create sth like this:
>
>  for i in 1:length(a){
>  if (wsp[i] == is.na(a)) {b=43}
>   }
> or like this
>
>  if(is.na(a)) b=3 else a
> [1]  1 NA  3  3  3
>
> but I always get an error:
>   the condition has length > 1 and only the first element will be used
>
> Could you help me how I may avoid this problem and use function  
> is.na inside
> function if - else
> Please

?ifelse
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