[R] Testing for empty result of which

[Phil Spector]

Francois -
    I think you're looking for the any function:

> x = c(1,2,3)
> y = c(4,5,6)
> any(x==y)
[1] FALSE
> any(which(x==y))
[1] FALSE
> x = c(1,2,3)
> y = c(4,2,5)
> any(x==y)
[1] TRUE
> any(which(x==y))
[1] TRUE

 					- Phil Spector
 					 Statistical Computing Facility
 					 Department of Statistics
 					 UC Berkeley
 					 spector at stat.berkeley.edu



On Tue, 15 Feb 2011, Francois Rousseu wrote:

>
> Hello R users
>
> When using the function which to get matches, I usually do
>
> w<-which(x==y)
> length(w)==0
>
> to determine if there are matches or not. Is there a base function that can do the thing more directly by returning a logical value if the result of which is empty or not?
>
> Thanks
> Francois Rousseu
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>