# superimpose

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##### 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 elements x and y.
##### 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.

concatxy, quadscheme

• superimpose
##### 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))
Documentation reproduced from package spatstat, version 1.5-4, License: GPL version 2 or newer

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