Need help with error on 'neighbors' function
1 view (last 30 days)
Show older comments
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.
5 Comments
Christine Tobler
on 2 Aug 2022
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.
Answers (0)
See Also
Categories
Find more on Specialized Power Systems in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!