[R] Logical "and"

Uwe Ligges ligges at statistik.uni-dortmund.de
Thu Nov 11 14:51:40 CET 2004


Alexander Sokol wrote:

> 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]]


a[!(a %in% b)]

or see ?setdiff

Uwe Ligges


> 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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