i want to get adjacency matrix of a network

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mks
mks 2023-7-30
评论： Steven Lord 2023-7-30
i have write this but is not running
clc;
clear all
n=10;
p=0.4;
adj_matrix = generate_adjacency_matrix(n, p);
function adj_matrix = generate_adjacency_matrix(n, p)
% Initialize an n x n matrix with all zeros
adj_matrix = zeros(n, n);
% Loop through all possible node pairs
for i = 1:n
for j = 1:n
% Skip diagonal elements (no self-loops)
if i == j
continue;
end
% Generate a random number between 0 and 1
random_number = rand();
% If the random number is less than p, add a link between nodes i and j
if random_number < p
adj_matrix(i, j) = 1;
adj_matrix(j, i) = 1; % Since it's an undirected network
end
end
end
end
disp(adj_matrix);

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回答（2 个）

Matt J
Matt J 2023-7-30
编辑：Matt J 2023-7-30
Easier:
function adj_matrix = generate_adjacency_matrix(n, p)
adj_matrix=triu(rand(n)<p,1);
adj_matrix=adj_matrix+adj_matrix'; % Since it's an undirected network
end
Steven Lord
Steven Lord 2023-7-30
Ran in:
If you want to generate both the graph object and its adjacency matrix, tell MATLAB to build the graph using just the upper triangular part of the random matrix.
n = 10;
p = 0.6;
A = rand(n) < p;
G = graph(A, 'upper');
adj = full(adjacency(G))
adj = 10×10
0 0 1 0 0 1 0 1 0 0 0 1 0 1 1 1 0 1 1 1 1 0 1 1 0 1 0 1 0 1 0 1 1 1 1 1 0 1 1 1 0 1 0 1 1 1 0 1 1 1 1 1 1 1 1 1 0 0 1 0 0 0 0 0 0 0 0 1 0 1 1 1 1 1 1 0 1 1 0 0 0 1 0 1 1 1 0 0 1 1 0 1 1 1 1 0 1 0 1 1
check = triu(A)+triu(A, 1).'
check = 10×10
0 0 1 0 0 1 0 1 0 0 0 1 0 1 1 1 0 1 1 1 1 0 1 1 0 1 0 1 0 1 0 1 1 1 1 1 0 1 1 1 0 1 0 1 1 1 0 1 1 1 1 1 1 1 1 1 0 0 1 0 0 0 0 0 0 0 0 1 0 1 1 1 1 1 1 0 1 1 0 0 0 1 0 1 1 1 0 0 1 1 0 1 1 1 1 0 1 0 1 1
isequal(adj, check)
ans = logical
1

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