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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