spatstat (version 1.41-1)

rescale.psp: Convert Line Segment Pattern to Another Unit of Length

Description

Converts a line segment pattern dataset to another unit of length.

Usage

## S3 method for class 'psp':
rescale(X, s, unitname)

Arguments

X

Line segment pattern (object of class "psp").

s

Conversion factor: the new units are s times the old units.

unitname

Optional. New name for the unit of length. See unitname.

Value

• Another line segment pattern (of class "psp"), representing the same data, but expressed in the new units.

Note

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

Details

This is a method for the generic function rescale.

The spatial coordinates in the line segment 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 line segment 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.

See Also

units, affine, rotate, shift

Examples

data(copper)
   X <- copper$Lines
   X
   # data are in km
   # convert to metres
   rescale(X, 1/1000)

   # convert data and rename unit
   rescale(X, 1/1000, c("metre", "metres"))