affine.ppp

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Apply Affine Transformation To Point Pattern

Applies any affine transformation of the plane (linear transformation plus vector shift) to a point pattern.

Keywords
spatial
Usage
affine.ppp(X, mat=diag(c(1,1)), vec=c(0,0), ...)
Arguments
X
Point pattern (object of class "ppp").
mat
Matrix representing a linear transformation.
vec
Vector of length 2 representing a translation.
...
Ignored
Details

The point pattern, and its window, are subjected first to the linear transformation represented by mat (multiplying on the left by mat), and are then translated by the vector vec. The argument mat must be a nonsingular $2 \times 2$ matrix.

This is a method for the generic function affine.

Value

  • Another point pattern (of class "ppp") representing the result of applying the affine transformation.

See Also

affine, affine.owin, rotate, shift

Aliases
  • affine.ppp
Examples
data(cells)
  # shear transformation
  X <- affine(cells, matrix(c(1,0,0.6,1),ncol=2))
  plot(X)
  # rescale y coordinates by factor 1.3
  plot(affine(cells, diag(c(1,1.3))))
Documentation reproduced from package spatstat, version 1.6-11, License: GPL version 2 or newer

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