[R] Matching - finding and listing data that is one object but not in another
R. Michael Weylandt <michael.weylandt@gmail.com>
michael.weylandt at gmail.com
Fri May 11 21:23:35 CEST 2012
? setdiff
Michael
On May 11, 2012, at 8:50 AM, James Holland <holland.aggie at gmail.com> wrote:
> What is the best way to find out what elements/numbers that are in one
> object are not in another.
>
>
> I came up with this method, but I'm wondering if there is a more efficient
> way (and one that doesn't seem so "clunky").
>
> #Example
>
> id <- c(1,2,3,4,5,6,7,9,10)
>
> example.1 <- data.frame(id)
>
> #Second object, this time with an 8 in it.
>
> id <- c(1,2,3,4,5,6,7,8,9,10)
>
> example.2 <- data.frame(id)
>
> finder <- example.2$id %in% example.1$id
>
> example.2 <- cbind(example.2,finder)
>
> missing.list <- subset(example.2, test2==F)
>
> [[alternative HTML version deleted]]
>
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