[R] combining tables

[Gabor Grothendieck]

Try this:

both <- c(x,y)
as.table(tapply(both, names(both), sum))

On 6/19/06, Robin Hankin <r.hankin at noc.soton.ac.uk> wrote:
> Hi
>
> Suppose I have two tables of counts of different animals and I
> wish to pool them so the total of the sum is the sum of the total.
>
> Toy example follows (the real ones are ~10^3 species and ~10^6
> individuals).
> x and y are zoos that have merged and I need a combined inventory
> including animals that are temporarily absent.
>
>
>  > (x <- as.table(c(cats=3,squid=7,pigs=2,dogs=1,slugs=0)))
> cats squid  pigs  dogs slugs
>     3     7     2     1     0
>  > (y <- as.table(c(cats=4,dogs=5,slugs=3,crabs=0)))
> cats  dogs slugs crabs
>     4     5     3     0
>  > (desired.output <- as.table(c
> (cats=7,squid=7,pigs=2,dogs=6,slugs=3,crabs=0)))
> cats squid  pigs  dogs slugs crabs
>     7     7     2     6     3     0
>  >
>
>
>
>
> Note that we have 7 cats altogether, and the crabs correctly show
> as zero counts.
>
>
> How to do this nicely in R?
>
>
>
>
> --
> Robin Hankin
> Uncertainty Analyst
> National Oceanography Centre, Southampton
> European Way, Southampton SO14 3ZH, UK
>  tel  023-8059-7743
>
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