[R] meaning of asymmetric on help page for intersect

[Christos Hatzis]

... which is the same as

setdiff(union(x, y), intersect(x, y))

-Christos 

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of 
> davidr at rhotrading.com
> Sent: Tuesday, January 13, 2009 10:56 AM
> To: Juliet Hannah; r-help at r-project.org
> Subject: Re: [R] meaning of asymmetric on help page for intersect
> 
> There is also a symmetric set difference = union(setdiff(x, 
> y), setdiff(y, x)) denoted x \Delta y
> 
> -- David
> 
> 
> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org]
> On Behalf Of Juliet Hannah
> Sent: Tuesday, January 13, 2009 9:41 AM
> To: r-help at r-project.org
> Subject: [R] meaning of asymmetric on help page for intersect
> 
> Sorry if this is a silly question. What does asymmetric refer 
> to from ?intersect, and are there any aspects of the result 
> that may be different from expected (reason for exclamation point) ?
> 
> As toy data, if needed, here are the examples from the help page.
> 
> (x <- c(sort(sample(1:20, 9)),NA))
> (y <- c(sort(sample(3:23, 7)),NA))
> 
> Thanks,
> 
> Juliet
> 
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> 
>