spatstat (version 1.31-3)

affine.lpp: Apply Geometrical Transformations to Point Pattern on a Linear Network

Description

Apply geometrical transformations to a point pattern on a linear network.

Usage

## S3 method for class 'lpp':
affine(X, mat=diag(c(1,1)), vec=c(0,0), ...)
  ## S3 method for class 'lpp':
shift(X, \dots)
  ## S3 method for class 'lpp':
rotate(X, angle=pi/2, \dots)
  ## S3 method for class 'lpp':
scalardilate(X, f, \dots)
  ## S3 method for class 'lpp':
rescale(X, s)

Arguments

X

Point pattern on a linear network (object of class "lpp").

mat

Matrix representing a linear transformation.

vec

Vector of length 2 representing a translation.

angle

Rotation angle in radians.

f

Scalar dilation factor.

s

Unit conversion factor: the new units are s times the old units.

...

Arguments passed to other methods.

Value

• Another point pattern on a linear network (object of class "lpp") representing the result of applying the geometrical transformation.

Details

These functions are methods for the generic functions affine, shift, rotate, rescale and scalardilate applicable to objects of class "lpp".

All of these functions perform geometrical transformations on the object X, except for rescale, which simply rescales the units of length.

See Also

lpp. Generic functions affine, shift, rotate, scalardilate, rescale.

Examples

X <- rpoislpp(2, simplenet)
  U <- rotate(X, pi)
  stretch <- diag(c(2,3))
  Y <- affine(X, mat=stretch)
  shear <- matrix(c(1,0,0.6,1),ncol=2, nrow=2)
  Z <- affine(X, mat=shear, vec=c(0, 1))