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linfun

Function on a Linear Network


Description

Create a function on a linear network.

Usage

linfun(f, L)

Arguments

f

A function in the R language.

L

A linear network (object of class "linnet") on which f is defined.

Details

This creates an object of class "linfun". This is a simple mechanism for handling a function defined on a linear network, to make it easier to display and manipulate.

f should be a function in the R language, with formal arguments x,y,seg,tp (and optional additional arguments) where x,y are Cartesian coordinates of locations on the linear network, seg, tp are the local coordinates.

The function f should be vectorised: that is, if x,y,seg,tp are numeric vectors of the same length n, then v <- f(x,y,seg,tp) should be a vector of length n.

L should be a linear network (object of class "linnet") on which the function f is well-defined.

The result is a function g in the R language which belongs to the special class "linfun". There are several methods for this class including print, plot and as.linim.

This function can be called as g(X) where X is an "lpp" object, or called as g(x,y) or g(x,y,seg,tp) where x,y,seg,tp are coordinates. If the original function f had additional arguments, then these may be included in the call to g, and will be passed to f.

Value

A function in the R\ language. It also belongs to the class "linfun" which has methods for plot, print etc.

Author(s)

See Also

methods.linfun for methods applicable to "linfun" objects.

Examples

f <- function(x,y,seg,tp) { x+y }
  g <- linfun(f, simplenet)
  plot(g)
  X <- runiflpp(3, simplenet)
  g(X)
  Z <- as.linim(g)

  f <- function(x,y,seg,tp, mul=1) { mul*(x+y) }
  g <- linfun(f, simplenet)
  plot(g)
  plot(g, mul=10)
  g(X, mul=10)
  Z <- as.linim(g, mul=10)

spatstat.linnet

Linear Networks Functionality of the 'spatstat' Family

v2.1-1
GPL (>= 2)
Authors
Adrian Baddeley [aut, cre], Rolf Turner [aut], Ege Rubak [aut], Ottmar Cronie [ctb], Tilman Davies [ctb], Greg McSwiggan [ctb], Suman Rakshit [ctb]
Initial release
2021-03-28

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