[R] Romoving elements from a vector. Looking for the opposite of c(), New user

[John Kane]

I think you've read Thomas's request in reverse. and
what he want is: 
x[!x %in% z]

Thanks for the %in% approach BTW.

--- Charilaos Skiadas <cskiadas at gmail.com> wrote:

> 
> On Nov 15, 2007, at 9:15 AM, Thomas Fr��jd
wrote:
> 
> > Hi
> >
> > I have three vectors say x, y, z. One of them, x
> contains observations
> > on a variable. To x I want to append all
> observations from y and
> > remove all from z. For appending c() is easily
> used
> >
> > x <- c(x,y)
> >
> > But how do I remove all observations in z from x?
> You can say I am
> > looking for the opposite of c().
> 
> If you are looking for the opposite of c, provided
> you want to remove  
> the first part of things, then perhaps this would
> work:
> 
> z<-c(x,y)
> z[-(1:length(x))]
> 
> However, if you wanted to remove all appearances of
> elements of x  
> from c(x,y), regardless of whether those elements
> appear in the x  
> part of in the y part, I think you would want:
> 
> z[!z %in% x]
> 
> Probably there are other ways.
> 
> Welcome to R!
> 
> > Best regards
> 
> Haris Skiadas
> Department of Mathematics and Computer Science
> Hanover College
>