How to creat topology with FOR loop

Hello everyone,

I'm trying to create random topology, i.e. to connect only specific nodes.

To elaborate better:

Let's say I have matrix

in 1st column (n) are Nodes --> 1,2,3,4,5

in 2nd column (x) are x values of nodes

in 3rd column (y) are y values of nodes

in 5th (a) and 6th (b) column are nodes to which node from 1st column connects to

let's say this is matrix described above (n x y a b):

1  0  0  2  3

2  3  1  4  5

3  1  3 NaN NaN

4  3  7 NaN NaN

5  7  3 NaN NaN

So first I plot nodes

plot(x,y,'o')

hold on

now I want to connect nodes in foward way given in matrix, i.e. node 1 connects to nodes 2 and 3, node 2 connects to nodes 4 and 5, and nodes 3,4,5 don't connect to any node.

I tried some for loop variations none of them worked, seems I simply don't know how to set up for loop to solve this problem.

Any direction and help is appreciated.

Thanks for your time,

Denis.

Answer 1

[Kelly Kearney]

As Walter suggested, for R2015b or later, use graph objects. Prior to that, take a look at gplot:

data = [...
1  0  0  2  3
2  3  1  4  5
3  1  3 NaN NaN
4  3  7 NaN NaN
5  7  3 NaN NaN];

nnode = size(data,1);

x = data(:,2);
y = data(:,3);

src = repmat(data(:,1), 1, size(data,2)-3);
tar = data(:,4:end);

src = src(~isnan(tar));
tar = tar(~isnan(tar));

% Pre-2015b

adj = sparse(src, tar, ones(size(src)), nnode, nnode);

gplot(adj, [x y]);
hold on;
plot(x, y, 'o');

% 2015b+

G = graph(src, tar);
plot(G, 'XData', x, 'YData', y);

[Denis Fajkovic]

Thank you :) This does the trick for me :) And I can optimize it for any number of nodes, this is great :)

Answer 2

[Walter Roberson]

If you have a new enough MATLAB, use graph()

[Denis Fajkovic]

Tnx, I know about that option, but I have 2015a...