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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