Create a graph with several isolated nodes and a few links

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Sim
Sim 2023-10-14
评论： Sim 2023-10-16
Ran in:
Why I am not able to create a graph with several isolated nodes and a few links?
s = [1
1
1];
t = [1
2
3];
XY = [ 1 1.5
1.2 1.7
1.3 1.3
1.7 2.2
1 2
4.2 2.9
3.5 2.5
3.8 2.9
3.8 3.2
3.6 3.1
3 3
3.4 3.4
3 2.3];
G = graph(s,t);
G.Nodes.X = XY(:,1); G.Nodes.Y = XY(:,2);
Error using .
To assign to or create a variable in a table, the number of rows must match the height of the table.

Error in graph/subsasgn>assignToNodes (line 161)
nodeprop = subsasgn(nodeprop, S, V);

Error in indexing (line 18)
G = assignToNodes(G, S, V);
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Dyuman Joshi
Dyuman Joshi 2023-10-14
Ran in:
But there are no isolated nodes in your graph -
s = [1
1
1];
t = [1
2
3];
G = graph(s,t);
plot(G)
Sim
Sim 2023-10-16
Hi @Dyuman Joshi! Thanks for your comments! I think @Steven Lord got my point..... Sorry, I think I did not explain well my issue... :-)

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采纳的回答

Steven Lord
Steven Lord 2023-10-14
Ran in:
Your code would work with one minor addition, a line that adds the additional nodes to the graph that are not present in the s and t vectors you use to create the graph.
s = [1
1
1];
t = [1
2
3];
XY = [ 1 1.5
1.2 1.7
1.3 1.3
1.7 2.2
1 2
4.2 2.9
3.5 2.5
3.8 2.9
3.8 3.2
3.6 3.1
3 3
3.4 3.4
3 2.3];
G = graph(s,t);
G = addnode(G, height(XY)-numnodes(G)); % Added
G.Nodes.X = XY(:,1);
G.Nodes.Y = XY(:,2);
Let's plot the graph and see the isolated nodes.
plot(G, 'XData', G.Nodes.X, 'YData', G.Nodes.Y)
If later on you want to connect some of those isolated nodes to others, use the addedge function.

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