[R] Error in if-command

[Michael Weylandt]

Take a look at ?ifelse

Cheers,
Michael

On Aug 12, 2012, at 3:12 AM, Dominic Roye <dominic.roye at gmail.com> wrote:

> Hello everybody,
> 
> I don't understand what I'm doing wrong. But it isn't possible that each
> element of the if-condition is tested for each vector element?
> 
> y <- c(1:20)
>> y
> [1]  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20
> 
>> if (y == c(4,5,9,11,17)) { print("yes")  } else { print("no")}
> [1] "no"
> warning:
> In if (y == c(4, 5, 9, 11, 17)) { :
>  Condition has length > 1 and only the first element is used
>> 
> 
> 
> #It also doesn't work with this condition ==2
> 
> if (y == 2) { print("yes")  } else { print("no")}
> [1] "no"
> warning:
> In if (y == 2) { :
> Condition has length> 1 and only the first element is used
> 
> 
> 
> I guess it's a trivial problem. I hope someone can help me.
> 
> Thank you!
> 
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> 
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