[R] Logical "and"

[Andy Bunn]

How about this?

a<-c(1,7,4,5,9,11)
b<-c(7,4,9)
a[!a %in% b]

b<-c(7,4,9, 100, 20, 34, 54)
a[!a %in% b]

see ?match, too

HTH, Andy


> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch
> [mailto:r-help-bounces at stat.math.ethz.ch]On Behalf Of Alexander Sokol
> Sent: Thursday, November 11, 2004 8:34 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] Logical "and"
> 
> 
> Hello,
> 
> I have the following very simple problem:
> 
> Say I have two vectors,
> 
> a<-c(1,7,4,5,9,11)
> b<-c(7,4,9)
> 
> I would like to create a vector containing the elements in a 
> which are not in 
> b.
> 
> Obviously, this is possible by writing
> 
> a[a!=b[1] & a!=b[2] & a!=b[3]]
> 
> But I would like a solution which is applicable to the situation 
> where the 
> number of elements in b is unknown.
> 
> I have looked in the R manuals, the FAQ and the mailing lists, 
> but have been 
> unable to find a solution.
> 
> Thank you for your replies,
>  Alexander
> 
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