How to add nodes and display it as a graph??

Question

Aswin Sandirakumaran 2018-6-28

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https://ww2.mathworks.cn/matlabcentral/answers/407859-how-to-add-nodes-and-display-it-as-a-graph

编辑： Stephan 2018-6-28

G = graph();
j = [1,2,3,4,5];
for i = 1:length(i)
     H = addnode(G,j(i));
    plot(H);
end

QUESTION: How to plot graph with all the nodes of j ?*

MY PROBLEM IS: IT just adds the node 1 which is 1, but it doesnt add other nodes 2,3,4,5

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Guillaume 2018-6-28

编辑：Guillaume 2018-6-28

What exactly are you trying to do? Why are you adding the nodes in a loop rather than all at once (or better create G with the nodes)? Are the j values supposed to be node ids or the number of nodes to add (so is it 5 or 15 nodes that need adding)?

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Answer 1

Stephan 2018-6-28

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https://ww2.mathworks.cn/matlabcentral/answers/407859-how-to-add-nodes-and-display-it-as-a-graph#answer_326671

编辑：Stephan 2018-6-28

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Hi,

one issue is, that you wrote:

for i = 1:length(i)

instead of:

for i = 1:length(j)

Since length(i) is equal to 1 you only got one node. Additionally the plot command can be set behind the for loop.

P.S.: It is good practice not to use i and j as Counter variables, because that can cause Trouble using complex numbers.

For a more detailled answer to this topic see the answer from Guillaume below.

Best regards

Stephan

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Guillaume 2018-6-28

编辑：Guillaume 2018-6-28

在 MATLAB Online 中打开

There are a lot more problems with the original code than just length(j) vs length(i) unfortunately.

Note that while the answer appears to do the correct thing, what it actually does is exactly equivalent to:

G = graph;
j = 1:5;
H = addnode(G, i(end));
plot(H);

This is because

H is overwritten at each step of the loop, discarding the result of all but the last iteration
addnode(G, x) adds x nodes to G. It does not add a node with number x to G