How to get the adjacency matrix from a cell array of strings?

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chocho 2017-5-25

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编辑： Walter Roberson 2017-6-6

采纳的回答： Guillaume

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Hi friends, I'm so sorry for asking multiple questions in a short time. i have this cell array of size(60*2), and i want to get the adjacency matrix from this cell array. i have tried sparse and accumarray but i get the following error :

accumarray(AA+1,1)
or
sparse(AA(:,1)+1,AA(:,2)+1,1)

Undefined function 'plus' for input arguments of type 'cell'.

Error in adj (line 5) sparse(AA(:,1)+1,AA(:,2)+1,1) Error in adj (line 5) accumarray(AA+1,1);

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Guillaume 2017-5-25

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If you're using a very ancient matlab version such as R2012a, then mention it in your question.

This would work on R2012a:

[nodenames, ~, id] = unique(AA(:));
adj = accumarray(reshape(id, size(AA)), 1, [numel(nodenames), numel(nodenames)]);

rows and columns of adj are in order of nodenames.

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chocho 2017-5-25

@Guillaume Thanks bro is worked now!

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Walter Roberson 2017-5-25

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adj = adjacency(graph(AA(:,1),AA(:,2)));

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Walter Roberson 2017-6-1

编辑：Walter Roberson 2017-6-6

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Change the all() to any()

However! You are using directed graphs, and just because nothing links to a particular node does not mean that the node is isolated: it might itself have links to other nodes.

When you remove columns but not rows then you distort the meaning.

If you have a square matrix perhaps you should be using

mask = any(Adjacency_Matrix_mod1,1) | any(Adjacency_Matrix_mod1,2);
new_adj = Adjacency_Matrix_mod1(:,mask);
new_nodenames = nodenames1(mask);

This will not remove an all-zero column unless the corresponding row is also empty

chocho 2017-6-6

@Walter Roberson, I think you are good at graphs,i opened a new question ,could you Plz check the adjacency matrix and transition i shared. With my respect to you!

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