shift.ppp {spatstat}R Documentation

Apply Vector Translation To Point Pattern

Description

Applies a vector shift to a point pattern.

Usage

 shift.ppp(X, vec=c(0,0))

Arguments

X Point pattern (object of class "ppp").
vec Vector of length 2 representing a translation.

Details

The point pattern, and its window, are translated by the vector vec.

This is a method for the generic function shift.

Value

Another point pattern (of class "ppp") representing the result of applying the vector shift.

Author(s)

Adrian Baddeley adrian@maths.uwa.edu.au http://www.maths.uwa.edu.au/~adrian/ and Rolf Turner rolf@math.unb.ca http://www.math.unb.ca/~rolf

See Also

shift, shift.owin, rotate, affine

Examples

  library(spatstat)
  data(cells)
  X <- shift(cells, c(2,3))
  
  plot(X)
  # no discernible difference except coordinates are different
  
  Y <- superimpose(cells, shift(cells, c(0.1,0.1)))
  plot(Y)
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