[R] adding tables [partial solution]

[Ross Boylan]

Answering myself...
On Mon, 2013-12-09 at 15:59 -0800, Ross Boylan wrote:
> Can anyone recommend a good way to add tables?
For count data, which were my main concern, it looks as if tabulate with
nbins will work.  I'm not sure how this works with a cross-classifying
factor, which I will also need.  It's possible the factor may have
missing values in some tabulations as well.

For the one dimensional case
 > t1 <- tabulate(c(1, 2, 2, 4), nbins=5)
 > t2 <- tabulate(c(2, 3, 5), nbins=5)
 > t1
 [1] 1 2 0 1 0
 > t2
 [1] 0 1 1 0 1
 > t1+t2
 [1] 1 3 1 1 1

> Ideally I would like
> t1 <- table(x1)
> t2 <- table(x2)
> t1+t2
> 
> It t1 and t2 have the same levels this works fine, but I need something
> that will work even if they differ, e.g.,
>  > t1
> 
>  1 2 4 5
>  2 1 1 1
>  > t2 <- table(c(10, 11, 12, 13))
>  > t1+t2  # apparently does simple vector addition
> 
>  1 2 4 5
>  3 2 2 2
> whereas I want
> 1 2 4 5 10 11 12 13
> 2 1 1 1  1  1  1  1
>