Logical "and"
You can use setdiff if you only need the unique values of a that are not in b. If you want all values you can use a[a%in%setdiff(a,b)] There are also intersection, union etc... see ?setdiff
On Thu, 11 Nov 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]] 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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