| linfun {spatstat} | R Documentation |
Create a function on a linear network.
linfun(f, L)
f |
A |
L |
A linear network (object of class |
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 f(x,y,seg,tp) or
f(x,y,seg,tp, ...) where x,y are
Cartesian coordinates of locations on the linear network,
seg, tp are the local coordinates, and
... are optional additional arguments.
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")
inside which the function f is well-defined.
The result is a function g in the R language which belongs to
the special class "linfun". 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. There are several methods
for this class including print, plot
and as.linim.
A function in the R\ language.
It also belongs to the class "linfun" which has methods
for plot, print etc.
Adrian Baddeley Adrian.Baddeley@curtin.edu.au and Rolf Turner r.turner@auckland.ac.nz
methods.linfun for methods applicable to
"linfun" objects.
f <- linfun(function(x,y,seg,tp) { x+y }, simplenet)
plot(f)
X <- runiflpp(3, simplenet)
plot(X, add=TRUE, cex=2)
f(X)