# pairdist.ppp

From spatstat v1.9-1
by Adrian Baddeley

##### Pairwise distances

Computes the matrix of distances between all pairs of points in a point pattern.

##### Usage

```
## S3 method for class 'ppp':
pairdist(X, \dots, method="C")
```

##### Arguments

- X
- A point pattern (object of class
`"ppp"`

). - ...
- Ignored.
- method
- String specifying which method of calculation to use.
Values are
`"C"`

and`"interpreted"`

. Usually not specified.

##### Details

This is a method for the generic function `pairdist`

.

Given a point pattern `X`

(an object of class `"ppp"`

),
this function computes the Euclidean distances between all pairs of
points in `X`

, and returns the matrix of distances.

The argument `method`

is not normally used. It is
retained only for checking the validity of the software.
If `method = "interpreted"`

then the distances are
computed using interpreted R code only. If `method="C"`

(the default) then C code is used. The C code is somewhat faster.

##### Value

- A square matrix whose
`[i,j]`

entry is the distance between the points numbered`i`

and`j`

.

##### See Also

`pairdist`

,
`pairdist.default`

,
`pairdist.psp`

,
`crossdist`

,
`nndist`

,
`Kest`

##### Examples

```
data(cells)
d <- pairdist(cells)
```

*Documentation reproduced from package spatstat, version 1.9-1, License: GPL version 2 or newer*

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