[R] ifelse()

[David Winsemius]

It is checking the series of values of X and returning a series of 1  
and 0's;
    1 if it meets your condition (X>0) and
    0 if it doesn't.

What did you expect?

A more complex invocation might look like this:
 > ifelse( X > 0, 1:3, -1:-2)
[1]  1  2  3  1 -1 -2
Note the recycling of the elements of the yes and no arguments

Consider also:

 > (X>0)+0
[1] 1 1 1 1 0 0


-- 
David Winsemius
On Feb 10, 2009, at 4:44 PM, kayj wrote:

>
> I have a problem with ifelse(), I do not understand how it works.
>
>> X<-c(2,2,1,1,0,0)
>> str(X)
> num [1:6] 2 2 1 1 0 0
>> Y<-ifelse(X>0,1,0)
>> Y
> [1] 1 1 1 1 0 0
>>
>
> Can some one explain what is going on, I do not understand what  
> ifelse is
> doing in this case. Can someone explain the output Y.
>
> Thanks
>
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