Create a function on a linear network.
A linear network (object of class
This creates an object of class
This is a simple mechanism for handling a function
defined on a linear network, to make it easier to display
f should be a
function in the R language,
with formal arguments
f(x,y,seg,tp, ...) where
Cartesian coordinates of locations on the linear network,
seg, tp are the local coordinates, and
... are optional additional arguments.
f should be vectorised: that is,
x,y,seg,tp are numeric vectors of the same length
v <- f(x,y,seg,tp)
should be a vector of length
L should be a linear network (object of class
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
X is an
or called as
x,y,seg,tp are coordinates. There are several methods
for this class including
A function in the R\ language.
It also belongs to the class
"linfun" which has methods
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