# rescale.ppp

0th

Percentile

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

Converts a point pattern dataset to another unit of length.

Keywords
spatial, math
##### 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.

unitname, rescale, rescale.owin, affine, rotate, shift

• rescale.ppp
##### 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 1.61-0, License: GPL (>= 2)

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