[R] counting the frequencies of a vector
Barry Rowlingson
b.rowlingson at lancaster.ac.uk
Thu Oct 16 18:50:27 CEST 2008
2008/10/16 Jörg Groß <joerg at licht-malerei.de>:
> Hi,
>
>
> Is there a function which counts the frequencies of the occurence of a
> number within an interval?
>
> for example I have this vector:
>
> x <- c(1, 3, 1.2, 5, 5.9)
>
> and I want a vector that gives me the frequencies within an interval of 2,
> beginning at 0
> (so the intervals are 0-2, 2-4, 4-6 and so on)
>
> so I get these frequencies:
>
> 2, 1, 2
>
>
> Which functions do I have to use for this purpose?
>
'cut' cuts your vector into chunks, and 'table' counts the number in
each chunk:
> x
[1] 1.0 3.0 1.2 5.0 5.9
> table(cut(x,c(0,2,4,6)))
(0,2] (2,4] (4,6]
2 1 2
Barry
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