[R] Test for list membership

[Uwe Ligges]

On 30.05.2011 15:36, Marcin Wlodarczak wrote:
>
> Hi,
>
> I need some help with this one: how do I check whether a vector is
> already present in a list of vectors.
>
> I have seen %in% recommended in a similar case but that obviously does
> not work here.
>
> c(1,2,3) %in% list(c(1,2,3), c(4,5,6))


You said it yourself, almost:

list(c(1,2,3)) %in% list(c(1,2,3), c(4,5,6))

Uwe Ligges


> returns
>
> [1] FALSE FALSE FALSE
>
> which makes sense since 1, 2 or 3 are not elements of that list. I don't
> really know how to move from there though.
>
> Best wishes,
> Marcin
>
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