# crossdist.ppx

##### Pairwise Distances Between Two Different Multi-Dimensional Point Patterns

Computes the distances between pairs of points taken from two different multi-dimensional point patterns.

##### Usage

```
## S3 method for class 'ppx':
crossdist(X, Y, \dots)
```

##### Arguments

- X,Y
- Multi-dimensional point patterns (objects of class
`"ppx"`

). - ...
- Arguments passed to
`coords.ppx`

to determine which coordinates should be used.

##### Details

Given two point patterns in multi-dimensional space, this function computes the Euclidean distance from each point in the first pattern to each point in the second pattern, and returns a matrix containing these distances.

This is a method for the generic function `crossdist`

for three-dimensional point patterns (objects of class `"ppx"`

).

This function expects two multidimensional
point patterns `X`

and `Y`

, and returns the matrix
whose `[i,j]`

entry is the distance from `X[i]`

to
`Y[j]`

.
By default, both spatial and temporal coordinates are extracted.
To obtain the spatial distance between points in a space-time point
pattern, set `temporal=FALSE`

.

##### Value

- A matrix whose
`[i,j]`

entry is the distance from the`i`

-th point in`X`

to the`j`

-th point in`Y`

.

##### See Also

##### Examples

```
df <- data.frame(x=runif(3),y=runif(3),z=runif(3),w=runif(3))
X <- ppx(data=df)
df <- data.frame(x=runif(5),y=runif(5),z=runif(5),w=runif(5))
Y <- ppx(data=df)
d <- crossdist(X, Y)
```

*Documentation reproduced from package spatstat, version 1.31-2, License: GPL (>= 2)*