Need help with error on 'neighbors' function

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Shemin Sagaria 2022-7-20

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评论： Shemin Sagaria 2022-8-3

Hi everyone,

I have a model developed in simulink with network connections. Each time the model has to analyse its neighbor nodes to progress. It is working fine during initial few seconds (upto 1000 sec), and I am facing error on 'neighbors' function after that (total runtime - 8760 sec). Each node have 2 neighbors.

s = [1 1 2 2 3 3 4 4]';
t = [2 3 1 4 1 4 2 3]';
v = [n1;n2;n3;n4]';
g = graph (s,t);
node = numel (v);
neg = find(v<0);
values_neg = v(neg);
ele = numel(neg);
z = zeros(1,node);
for k = 1:ele
    for i = 1:node
        if v(1,i)<0
            a = neighbors(g, i);
            b = v(a);
            s = 0;
            for j=1:connection
               if b(j)>0
                   s = s+b(j);
               end
            end
            z(1,i) = s+v(1,i);
        else
            z (1,i)= 0;
        end
    end
    z';
    zmin = min (z);
    imin = find(z==zmin);
    n = neighbors(g, imin);
    vmin = v(imin);
    [vmax, imax] = max(v(n));
    borrowvalue = min(-vmin, vmax);
    v(imin) = v(imin) + borrowvalue;
    v(n(imax)) = v(n(imax)) - borrowvalue;
end

Error as follows:

Node ID must be a positive integer scalar not greater than the number of nodes in the graph (4). Error in 'four_Node/Subsystem/Energy management' (line 55) n = neighbors(g, imin);

Component: Simulink | Category: Model error

An error occurred while running the simulation and the simulation was terminated

Caused by:

Simulation stopped because of a runtime error.

I am using MATLAB 2021a. I hope some expericed member in the community can help me with this.

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Christine Tobler 2022-8-2

The error message is because the second input to neighbors is larger than the number of nodes in graph g. How is the graph g constructed? Does this change between time steps?

Possibly you need to make sure to use the constructor graph(s, t, numNodes) so that you have the correct number of nodes even if node 4 isn't connected to any edge.

Shemin Sagaria 2022-8-3