`addnode`

Adds nodes to a graph or digraph.

Category: Mathematics > Graph and Network Algorithms

Syntax

H = addnode(G, N)

Appends N unnamed nodes.

H = addnode(G, names)

Appends one node per name in the cell array or character vector names.

Description

The new nodes are isolated: they have no edges until you add some with addedge. They receive the next indices after the existing nodes.

To name the nodes of a graph, build it with names from the start or add named nodes to a graph that already has names.

Input arguments

G: A graph or digraph.
N: Number of nodes to add.
names: Names for the new nodes: a character vector, or a cell array of them.

Output arguments

H: Graph with the extra nodes and the same edges as G.

Example

Isolated nodes

G = graph([1 2], [2 3]);
H = addnode(G, 2);
disp([numnodes(H) numedges(H)])
disp(degree(H)')
N = graph({'a','b'}, {'b','c'});
N = addnode(N, 'z');
disp(N.Nodes.Name')

Output

     5     2
     1     2     1     0     0
    {'a'}    {'b'}    {'c'}    {'z'}

addnode