Re: [R] Test for list membership

From: Sarah Goslee <sarah.goslee_at_gmail.com>
Date: Mon, 30 May 2011 10:16:49 -0400

You almost solved your own problem with that last statement. Instead of comparing apples and oranges, you need to compare oranges and oranges:

> list(c(1,2,3)) %in% list(c(1,2,3), c(4,5,6))
[1] TRUE
> list(c(1,2,3)) %in% list(c(1,2,9), c(4,5,6))
[1] FALSE Sarah

On Mon, May 30, 2011 at 9:36 AM, Marcin Wlodarczak <mwlodarczak_at_uni-bielefeld.de> 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))
>
> 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
>

-- 
Sarah Goslee
http://www.functionaldiversity.org

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Received on Mon 30 May 2011 - 14:18:51 GMT

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