rmnode

Remove node from graph

Description

example

H = rmnode(G,nodeIDs) removes the nodes specified by nodeIDs from graph G. Any edges incident upon the nodes in nodeIDs are also removed. rmnode refreshes the numbering of the nodes in H, such that if you removed node k, then nodes 1:k-1 have the same node numbers in H, and nodes k+1:numnodes(G) in G become k:numnodes(H) in H.

Examples

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Create and plot a graph.

s = [1 1 1 2 2 3];
t = [2 3 4 3 4 4];
G = graph(s,t);
plot(G) Remove node 1 from the graph and plot the result. The nodes in the new graph are automatically renumbered.

G = rmnode(G,1);
plot(G) Create and plot a graph with named nodes.

s = [1 1 1 1 2 2 3 3 3 5 5];
t = [2 3 4 6 1 5 4 5 6 4 6];
names = {'New York' 'Los Angeles' 'Washington D.C.' 'Pittsburgh' ...
'Denver' 'Austin'};
G = digraph(s,t,[],names);
plot(G) Remove the nodes 'New York' and 'Pittsburgh' from the graph, then replot the result.

G = rmnode(G,{'New York' 'Pittsburgh'});
plot(G,'Layout','force') Input Arguments

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Input graph, specified as either a graph or digraph object. Use graph to create an undirected graph or digraph to create a directed graph.

Example: G = graph(1,2)

Example: G = digraph([1 2],[2 3])

Node identifiers, specified as one or more node indices or node names.

This table shows the different ways to refer to one or more nodes either by their numeric node indices or by their node names.

FormSingle NodeMultiple Nodes
Node index

Scalar

Example: 1

Vector

Example: [1 2 3]

Node name

Character vector

Example: 'A'

Cell array of character vectors

Example: {'A' 'B' 'C'}

String scalar

Example: "A"

String array

Example: ["A" "B" "C"]

Example: G = rmnode(G,[1 2]) removes node 1 and node 2 from graph G.

Output Arguments

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Output graph, returned as a graph or digraph object.