MATLAB: Adjacency matrix formation from n*n matrix

matrix array

I have a matrix

A= [ 1 2

1 3

1 4

2 3

2 4

3 4 ]

and another weight matrix W= [4, 2, 3, 1] i.e weight of the first pair of A is 4, second pair is 2 etc.

i want to output in the form

edgeData = [1 2 4; 2 3 2; 1 3 3; 1 4 1];

Best Answer

edgeData = [A, W(:)]

Note that this is not an adjacency matrix.

Also, you may actually want to input that into a graph or digraph:

G = graph(A(:, 1), A(:, 2), W(:))

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MATLAB: How to check and update one matrix by comparing the element of another matrix

Use ismember with the 'rows' option:

A = [1 2 3; 1 2 4; 1 2 5; 1 3 4; 1 3 5; 1 4 5; 2 3 4; 2 3 5; 2 4 5; 3 4 5];
B = [1 2; 2 3; 4 5]; %reduced second matrix so some rows of A are missing
isrowpresent = ismember(A(:, [2 3]), B, 'rows');
A(~isrowpresent, :) = [] %delete rows not present

MATLAB: Convert weighted digraph to undirected

Take the adjacency matrix of the weighted digraph and add it to its transpose; build an undirected graph from the result.

Best Answer

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MATLAB: How to check and update one matrix by comparing the element of another matrix

MATLAB: Convert weighted digraph to undirected

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