[R] how to get the position of a vector-value
jim holtman
jholtman at gmail.com
Wed Jul 30 03:17:11 CEST 2008
?findInterval
> x <- c(1.0,1.2,1.4,1.6,1.8,2.0)
> findInterval(1.4,x)
[1] 3
> findInterval(1.5,x)
[1] 3
> findInterval(10,x)
[1] 6
On Tue, Jul 29, 2008 at 8:32 PM, Jörg Groß <joerg at licht-malerei.de> wrote:
> I am searching for a way to get nearest position of a number in a vector
> from a search-value.
>
> So perhaps if I have this vector:
> 1.0 1.2 1.4 1.6 1.8 2.0
>
> I want to get the position of a special number.
>
> with match(1.4 ,x), I get "3" for position three.
>
> But now I want the nearest number in that vector from perhaps 1.5 (the
> mean).
>
>
>
> I tried it with sequences:
> match(seq(from=1.1, to=1.6, by=.1),x)
>
> but what I get is:
> [1] NA NA NA NA NA 4
> (instead of (NA 2 NA 3 NA 4).
>
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> and provide commented, minimal, self-contained, reproducible code.
>
--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
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