Insert New Vertices in a Linear Network
Adds new vertices to a linear network at specified locations along the network.
insertVertices(L, ...)
L |
Linear network (object of class |
... |
Additional arguments passed to |
This function adds new vertices at locations along an existing linear network.
The argument L can be either a linear network (class
"linnet") or some other object that includes a linear network.
The new vertex locations can be specified either as a
point pattern (class "lpp" or "ppp")
or using coordinate vectors x,y or seg,tp
or x,y,seg,tp as explained in the help for as.lpp.
This function breaks the existing line segments
of L into pieces at the locations specified by
the coordinates seg,tp and creates new vertices at these
locations.
The result is the modified object, with an attribute "id" such that
the ith added vertex has become the
id[i]th vertex of the new network.
An object of the same class as L representing the result of
adding the new vertices.
The result also has an attribute "id" as described in Details.
Adrian Baddeley
addVertices to create new vertices at locations which
are not yet on the network.
opa <- par(mfrow=c(1,3), mar=rep(0,4)) simplenet plot(simplenet, main="") plot(vertices(simplenet), add=TRUE) # add two new vertices at specified local coordinates L <- insertVertices(simplenet, seg=c(3,7), tp=c(0.2, 0.5)) L plot(L, main="") plot(vertices(L), add=TRUE) id <- attr(L, "id") id plot(vertices(L)[id], add=TRUE, pch=16) # add new vertices at three randomly-generated points X <- runiflpp(3, simplenet) LL <- insertVertices(simplenet, X) plot(LL, main="") plot(vertices(LL), add=TRUE) ii <- attr(LL, "id") plot(vertices(LL)[ii], add=TRUE, pch=16) par(opa)
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