[R] apply if else statement to vector

[Berend Hasselman]

On 02-10-2014, at 11:01, rl at openmailbox.org wrote:

> Subscribers,
> 
> What is the correct syntax to apply the 'if else' conditional statement to vector objects?
> 
> Example:
> 
> vectorx<-c(50,50,20,70)
> vectory<-c(50,50,20,20)
> vectorz<-function () {
> 	if (vectorx>vectory)
> 	vectorx
> 	else vectorx<-0
> }
> 
> vectorz()
> Warning message:
> In if (vectorx > vectory) vectorx else vectorx <- 0 :
>  the condition has length > 1 and only the first element will be used
> 
> The help manual (?'if') explains that only length=0 is acceptable; what is an appropriate alternative function to use please?
> 

And at the bottom of that page (section See Also) there is a reference to ifelse. Why didn’t you have a look at that?

Replace your complete if/else statement with ifelse(vectorx>vectory,vectorx,0)

Berend


> 
> 0 0 0 70
> 
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