# rescale.ppp

##### Convert Point Pattern to Another Unit of Length

Converts a point pattern dataset to another unit of length.

##### Usage

```
# S3 method for ppp
rescale(X, s, unitname)
```

##### Arguments

- X
Point pattern (object of class

`"ppp"`

).- s
Conversion factor: the new units are

`s`

times the old units.- unitname
Optional. New name for the unit of length. See

`unitname`

.

##### Details

This is a method for the generic function `rescale`

.

The spatial coordinates in the point pattern `X`

(and its window) will be re-expressed
in terms of a new unit of length that is `s`

times the current
unit of length given in `X`

.
(Thus, the coordinate values are *divided* by `s`

,
while the unit value is multiplied by `s`

).

The result is a point pattern representing the *same* data
but re-expressed in a different unit.

Mark values are unchanged.

If `s`

is missing, then the coordinates will be re-expressed
in ‘native’ units; for example if the current unit is
equal to 0.1 metres, then the coordinates will be re-expressed in metres.

##### Value

Another point pattern (of class `"ppp"`

),
representing the same data, but expressed in the new units.

##### Note

The result of this operation is equivalent to the original point pattern.
If you want to actually change the coordinates by
a linear transformation, producing a point pattern that is not
equivalent to the original one, use `affine`

.

##### See Also

##### Examples

```
# NOT RUN {
# Bramble Canes data: 1 unit = 9 metres
data(bramblecanes)
# convert to metres
bram <- rescale(bramblecanes, 1/9)
# or equivalently
bram <- rescale(bramblecanes)
# }
```

*Documentation reproduced from package spatstat, version 1.55-1, License: GPL (>= 2)*