superimpose
Superimpose Several Point Patterns
Superimpose any number of point patterns.
- Keywords
- spatial
Usage
superimpose(...)Arguments
- ...
- Any number of arguments, each of which represents a point pattern.
Each argument must be either a point pattern
object (of class
"ppp") or a structure containing elementsxandy.
Details
This function is used to superimpose two or more point patterns
(see also concatxy).
It assumes that each of the arguments in
... is either a point pattern object (of class "ppp")
or a structure containing (at least) the elements
x and y. All the point patterns are assumed to have
the same window of observation.
The first argument must be a point pattern object, and it determines the observation window for the result.
If any of the arguments is a marked point pattern, then all of them must be. In that case, the result is also a marked point pattern.
If the arguments are given in the form name=value,
then the names will be used
as marks attached to the corresponding points. See the last line
in the Examples.
Value
- A point pattern (object of class
"ppp") representing the superposition (union) of all the point patterns.
See Also
Examples
dat <- runifrect(30)
xy <- list(x=runif(10),y=runif(10))
new <- superimpose(dat, xy)
plot(new)
# how to make a 2-type point pattern with types "a" and "b"
u <- superimpose(a = rpoispp(10), b = rpoispp(20))
# how to make a 2-type point pattern with types 1 and 2
u <- superimpose("1" = rpoispp(10), "2" = rpoispp(20))