How to get matrices of edges and nodes from Simulink model

I have a simulink model and I want to create a digraph of the block connections. I used the 'Portconnectivity' command to find each blocks source and destination block. I don't know how to create a digraph using the information from the 'Portconnectivity' command because I don't want to manually input all the nodes and edges. How do I generate a matrix of the nodes and edges in a Simulink model without manually inputting them so I can make a digraph of the block connections.

Answer 1

[Yukthi S]

Hi Madison Ohara

I got that you wanted to create digraph of the block connections without manually giving input nodes and edges.

I assume that you are using the latest Release of MATLAB since you did not mention any information about that.

The following MATLAB code will help you generate the digraph.

% Load the Simulink model (replace 'modelname' with the name of your model)
modelname = 'name_of_your_model';
load_system(modelname);

% Get a list of all blocks in the model
blocks = find_system(modelname, 'Type', 'Block');

% Initialize source and target node lists
sourceNodes = {};
targetNodes = {};

% Loop through each block and get its port connectivity
for i = 1:length(blocks)
    % Get port connectivity information for the current block
    ports = get_param(blocks{i}, 'PortConnectivity');
    
    % Loop through each destination port
    for j = 1:length(ports)
        dstBlock = ports(j).DstBlock;
        % Check if the destination block handle is valid (not -1)
        if dstBlock ~= -1
            % Get the name of the destination block
            dstBlockName = getfullname(dstBlock);
            % Add the source and target nodes to the lists
            sourceNodes{end+1} = getfullname(blocks{i}); % Source block name
            targetNodes{end+1} = dstBlockName;           % Destination block name
        end
    end
end

% Create the directed graph from the node lists
G = digraph(sourceNodes, targetNodes);

% Plot the graph
figure;
plot(G);

You can also refer to the MATLAB documentation links of all the functions used in the above code:

“load_system”:https://in.mathworks.com/help/simulink/slref/load_system.html#:~:text=Load%20Model%20into%20Memory

“find_system": https://in.mathworks.com/help/simulink/slref/find_system.html#:~:text=find_system(%27type%27%2C%27block_diagram%27)

“get_param”:https://in.mathworks.com/help/simulink/slref/get_param.html#:~:text=Product%20Updates-,get_param,-Get%20parameter%20names

“getfullname”: https://in.mathworks.com/help/simulink/slref/getfullname.html?s_tid=doc_ta#:~:text=Product%20Updates-,getfullname,-Get%20path%20that

“digraph”:https://in.mathworks.com/help/matlab/ref/digraph.html#d126e384544:~:text=example-,G,-%3D%20digraph(A%2Cnodenames