iGraph Cheat Sheet

A Programming › R cheat sheet in English by trvoldemort

iGraph Commands

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Gaining information about graph structure

`vcount(g)`	count the number of vertices
`ecount(g)`	count the number of edges
`neighbors(g,v)`	list the neighbors of a vertex
`incident(g,v)`	list the incident edges of a vertex
`is.directed(g)`	determine whether the graph is directed
`are.connected(g,v1,v2)`	determine whether there is an edge between two vertices
`get.edge(g,id)`	get endpoints of an edge
`get.edges(g,es)`	get endpoints of a list of edges

Graph, vertex and edge attributes

In the following functions, ? can be graph, vertex or edge.

get.?.attribute(g,n)

set.?.attribute(g,n,v)

list.?.attributes(g)

?.attributes(g)

remove.?.attribute(g,n)

Various methods for creating graphs

`graph.empty()`
`graph.star(n)`
`graph.lattice(c(n,m))`
`graph.ring(n)`
`graph.tree(n)`
`graph.full(n)`
`graph.full.citation(n)`
`graph.atlas(0-1252)`
`graph(c(1,2,2,3,3,4,...))`
`graph.edgelist(edge.matrix)`
`graph.formula(1-2,3,4-+5)`

Vertex and edge sequences and iterators

`V(g)`	list vertices in a `igraph.vs` object
`V(g)$number`	get or set vertices properties
`V(g)[number<50]`	get a subset of vertices
`E(g)`	list edges in a `igraph.es` object

Method for structural manipulation of graphs

`g[]`	get and set adjacency matrix
`g[[]]`	get adjacency list

Degree and degree distribution of the vertices

`degree(g)`
`degree.distribution(g)`

Graph Algebra

`graph.union(g1,g2)`
`graph.difference(g1,g2)`

Print Graph

`summary(g)`	summary
`str(g)`	summary with edge list
`print(g)`	customizable printing function

Neighborhood of graph vertices

`neighborhood.size(g,o)`	gives a list of neighborhood size for each vertex
`neighborhood(g,o)`	gives a list of neighborhood vertices for each vertex
`graph.neighborhood(g,o)`	gives the neighborhood graphs
`connect.neighborhood(g,o)`	creates a new graph by connect each vertex with its neighbor vertices

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Comments (1)

Anonymous 14:03 10 Dec 2018

good cheat sheet