[R] [solved] How to count numbers of a vector and use them as index values?

[Paul Menzel]

Am Sonntag, den 31.07.2011, 15:19 -0700 schrieb Jeffrey Dick:
> Here's an attempt using sapply:
> 
> > x <- c(2, 2, 3, 3, 4, 6)
> > ys <- 1:8
> > sapply(ys, function(y) { length(which(x==y)) } )
> [1] 0 2 2 1 0 1 0 0

The last piece for my trials missing was `sapply()` which I overlooked
reading `?lapply()` inspired by [1].

So an alternative is

> x <- c(2, 2, 3, 3, 4, 6)
> ys <- 1:8
> sapply(ys, function(y) { sum(x==y) } )
[1] 0 2 2 1 0 1 0 0

which is of course overkill reading Dénes’ response.

> tabulate(x, 8)
[1] 0 2 2 1 0 1 0 0


Thank you all,

Paul


[1] http://www.r-bloggers.com/thinking-in-r-vectors/
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