linnet
From spatstat v1.36-0
by Adrian Baddeley
Create a Linear Network
Creates an object of class "linnet"
representing
a network of line segments.
- Keywords
- spatial
Usage
linnet(vertices, m, edges)
Arguments
- vertices
- Point pattern (object of class
"ppp"
) specifying the vertices of the network. - m
- Adjacency matrix. A matrix of logical values equal to
TRUE
when the corresponding vertices are joined by a line. (Specify eitherm
oredges
.) - edges
- Edge list. A two-column matrix of integers,
specifying all pairs of vertices
that should be joined by an edge.
(Specify either
m
oredges
.)
Details
An object of class "linnet"
represents a network of
straight line segments in two dimensions. The function linnet
creates
such an object from the minimal information: the spatial location
of each vertex (endpoint, crossing point or meeting point of lines)
and information about which vertices are joined by an edge.
This function can take some time to execute, because the algorithm computes various properties of the network that are stored in the resulting object.
Value
- Object of class
"linnet"
representing the linear network.
See Also
simplenet
for an example of a linear network.
methods.linnet
for
methods applicable to linnet
objects.
ppp
,
psp
.
Examples
# letter 'A' specified by adjacency matrix
v <- ppp(x=(-2):2, y=3*c(0,1,2,1,0), c(-3,3), c(-1,7))
m <- matrix(FALSE, 5,5)
for(i in 1:4) m[i,i+1] <- TRUE
m[2,4] <- TRUE
m <- m | t(m)
letterA <- linnet(v, m)
plot(letterA)
# letter 'A' specified by edge list
edg <- cbind(1:4, 2:5)
edg <- rbind(edg, c(2,4))
letterA <- linnet(v, edges=edg)
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