How do I change the topology of my nodes?

Hi,

I want to connect the PSE with multiple PDs in a bus topology like this.

PSE----------------------------------------------------------------------

|| || ||

PD1 PD2 PD3

Any help would be great. Thanks!

This is my code :

% Create connection matrix
connections = zeros(num_nodes + 1);

% Connect each PD to the PSE from the left side
connections(1, 2) = 1;
connections(1, 3) = 1;
connections(1, 4) = 1;

% Create a digraph object
g = digraph(connections);

% Set the node properties
g.Nodes.Name = {'PSE'; 'PD1'; 'PD2'; 'PD3'};
g.Nodes.Type = {'PSE'; 'PD'; 'PD'; 'PD'};

% Define the node positions
nodePositions = [0, 0; 0, -1; 0, -2; 0, -3];

% Define custom markers for PSE and PDs
pseMarker = 's';
pdMarker = 's';

% Plot the graph with customized node markers and positions
figure;
h = plot(g, 'NodeColor', 'r', 'NodeLabel', '', 'MarkerSize', 10, ...
    'XData', nodePositions(:, 1), 'YData', nodePositions(:, 2), 'ShowArrows', 'off');

% Customize the node markers
hold on;
for i = 1:num_nodes+1
    if i == 1
        marker = pseMarker;
    else
        marker = pdMarker;
    end
    plot(nodePositions(i, 1), nodePositions(i, 2), marker, 'MarkerSize', 20, 'MarkerFaceColor', 'r');
end
hold off;

% Adjust the axes limits
xLimits = [min(nodePositions(:, 1)) - 1, max(nodePositions(:, 1)) + 1];
yLimits = [min(nodePositions(:, 2)) - 1, max(nodePositions(:, 2)) + 1];
axis([xLimits, yLimits]);

% Add edge labels
edgeLabels = {'PD1'; 'PD2'; 'PD3'};
edgeIdx = find(connections(2:end, 1));
edgeX = nodePositions(edgeIdx, 1);
edgeY = nodePositions(edgeIdx, 2);

Answer 1

[Amit Dhakite]

Hi Divya,

After analysing your code, I got to know that the "nodePositions" are forming a straight line.

If you want to arrange the nodes in a bus topology, you can change the "nodePositions" as described below:

% Define the number of nodes
num_nodes = 3;

% Create connection matrix
connections = zeros(num_nodes + 1);

% Connect each PD to the PSE from the left side
connections(1, 2) = 1;
connections(1, 3) = 1;
connections(1, 4) = 1;

% Create a digraph
g = digraph(connections);

% Define the node positions
nodePositions = [0, 0; -1, -1; 0, -1; 1, -1];

% Plot the graph with customized node markers and positions
figure;
h = plot(g, 'NodeColor', 'r', 'NodeLabel', '', 'MarkerSize', 10, ...
    'XData', nodePositions(:, 1), 'YData', nodePositions(:, 2), 'ShowArrows', 'off');

If you want to represent multiple PSE nodes, then you can consider the following example:

% Create connection matrix
connections = zeros(6);

% Connect each PD to one of the PSE
connections(1, 4) = 1;
connections(2, 5) = 1;
connections(3, 6) = 1;
connections(1, 2) = 1;
connections(2, 3) = 1;

% Create a digraph
g = digraph(connections);

% Define the node positions
nodePositions = [-1, 0; 0, 0; 1, 0; -1, -1; 0, -1; 1, -1];

% Plot the graph with customized node markers and positions
figure;
h = plot(g, 'NodeColor', 'r', 'NodeLabel', '', 'MarkerSize', 10, ...
    'XData', nodePositions(:, 1), 'YData', nodePositions(:, 2), 'ShowArrows', 'off');