Overview of the networks Package
Calling Sequence
Description
List of networks Package Commands
Examples
networks[command](arguments)
command(arguments)
Important: The networks package has been deprecated. Use the superseding package GraphTheory instead.
Each command in the networks package can be accessed by using either the long form or the short form of the command name in the command calling sequence.
A network is represented by a graph consisting of vertices and edges. The edges may be directed, and loops and multiple edges are allowed. The basic commands in this package perform the manipulation of the underlying graphs. Various properties of the networks as outlined below can also be computed.
A graph is represented by a special Maple procedure of type GRAPH. A graph is created by the command new() or by commands such as complete(), cycle(), or petersen(). Once created, the graph can be modified by using various commands. To create a copy of a graph, use the command duplicate(). Further modifications of the original graph will not affect the copy.
To generate a random graph use random(). Either the number of vertices and the probability of an edge occurring, or the number of vertices and edges may be specified.
You can add vertices and edges to the graph using the commands addvertex(), and addedge(). Vertex names are numeric by default but can be any valid Maple name. They have a default weight of 0. Edge names are taken from the sequence $\mathrm{cat}\left(e\,1..m\right)$ by default, but can be any name or string beginning with the letter `e`. Edges can be specified as sets or lists of vertices. A list indicates a directed edge, while a set indicates an undirected edge. Edges have a default weight of 1. Weights can be general Maple expressions.
All deletions are handled by the delete() command.
To determine properties of a given graph, G, use commands such as edges(G), or vertices(G).
The following is a list of available commands
acycpoly
addedge
addvertex
allpairs
ancestor
arrivals
bicomponents
charpoly
chrompoly
complement
complete
components
connect
connectivity
contract
countcuts
counttrees
cube
cycle
cyclebase
daughter
degreeseq
delete
departures
diameter
dinic
djspantree
dodecahedron
draw
draw3d
duplicate
edges
ends
eweight
flow
flowpoly
fundcyc
getlabel
girth
graph
graphical
gsimp
gunion
head
icosahedron
incidence
incident
indegree
induce
isplanar
maxdegree
mincut
mindegree
neighbors
new
octahedron
outdegree
path
petersen
random
rank
rankpoly
shortpathtree
show
shrink
span
spanpoly
spantree
tail
tetrahedron
tuttepoly
vdegree
vertices
void
vweight
The commands in the above list include implementations of a number of basic routines including network flows, connectivity, disjoint spanning trees, all-pairs shortest path, single-source shortest path, minimum weight spanning tree, Tutte polynomials and special evaluations of them (rank, span, acyclicity, chromatic and flow polynomials), and characteristic polynomials.
To display the help page for a particular networks command, see Getting Help with a Command in a Package.
$\mathrm{with}\left(\mathrm{networks}\right)\:$
$\mathrm{new}\left(G\right)\:$
$\mathrm{addvertex}\left(\left\{1\,2\,3\,4\right\}\,G\right)$
${1}{\,}{2}{\,}{3}{\,}{4}$
$\mathrm{connect}\left(\left\{1\,2\right\}\,\left\{3\,4\right\}\,G\right)$
${\mathrm{e1}}{\,}{\mathrm{e2}}{\,}{\mathrm{e3}}{\,}{\mathrm{e4}}$
$\mathrm{edges}\left(G\right)$
$\left\{{\mathrm{e1}}{\,}{\mathrm{e2}}{\,}{\mathrm{e3}}{\,}{\mathrm{e4}}\right\}$
$\mathrm{connectivity}\left(G\right)$
${2}$
$\mathrm{countcuts}\left(G\right)$
${6}$
$\mathrm{draw}\left(G\right)\:$
See Also
GraphTheory
UsingPackages
with
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