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rmnode

Remove node from graph

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Syntax

H = rmnode(G,nodeIDs)

Description

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.

example

Examples

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Open Live Script

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)

Figure contains an axes object. The axes object contains an object of type graphplot.

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)

Figure contains an axes object. The axes object contains an object of type graphplot.

Open Live Script

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)

Figure contains an axes object. The axes object contains an object of type graphplot.

Remove the nodes 'New York' and 'Pittsburgh' from the graph, then replot the result.

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

Figure contains an axes object. The axes object contains an object of type graphplot.

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.

Extended Capabilities

Thread-Based Environment
Run code in the background using MATLAB® backgroundPool or accelerate code with Parallel Computing Toolbox™ ThreadPool.

Version History

Introduced in R2015b

See Also

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