[R] Logical "and"

[Roger D. Peng]

Try

setdiff(a, b)

-roger

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]]
> 
> 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
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
> 

-- 
Roger D. Peng
http://www.biostat.jhsph.edu/~rpeng/