affine.lpp

From spatstat v1.41-1 by Adrian Baddeley

Apply Geometrical Transformations to Point Pattern on a Linear Network

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

Keywords: spatial, math

Usage

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

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.
origin: Character string determining a location that will be shifted to the origin. Options are "centroid", "midpoint" and "bottomleft". Partially matched.
centre: Centre of rotation. Either a vector of length 2, or a character string (partially matched to "centroid", "midpoint" or "bottomleft"). The default is the coordinate origin c(0,0).
unitname: Optional. New name for the unit of length. A value acceptable to the function unitname<-

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.

Value

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

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))

Documentation reproduced from package spatstat, version 1.41-1, License: GPL (>= 2)

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