Concatenate any number of pairs of `x`

and `y`

coordinate vectors.

`concatxy(…)`

…

Any number of arguments, each of which is a structure
containing elements `x`

and `y`

.

A list with two components `x`

and `y`

, which are the
concatenations of all the corresponding `x`

and `y`

vectors in the argument list.

This function can be used to superimpose two or more point patterns
of unmarked points (but see also `superimpose`

which is
recommended).

It assumes that each of the arguments in
`…`

is a structure containing (at least) the elements
`x`

and `y`

. It concatenates all the `x`

elements
into a vector `x`

, and similarly for `y`

, and returns these
concatenated vectors.

# NOT RUN { dat <- runifrect(30) xy <- list(x=runif(10),y=runif(10)) new <- concatxy(dat, xy) # }