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

2 vues (au cours des 30 derniers jours)
chocho le 25 Mai 2017
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);
##### 0 commentairesAfficher -2 commentaires plus anciensMasquer -2 commentaires plus anciens

Connectez-vous pour commenter.

### Réponse acceptée

Guillaume le 25 Mai 2017
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.
##### 1 commentaireAfficher -1 commentaires plus anciensMasquer -1 commentaires plus anciens
chocho le 25 Mai 2017
@Guillaume Thanks bro is worked now!

Connectez-vous pour commenter.

### Plus de réponses (1)

Walter Roberson le 25 Mai 2017
##### 22 commentairesAfficher 20 commentaires plus anciensMasquer 20 commentaires plus anciens
Walter Roberson le 1 Juin 2017
Modifié(e) : Walter Roberson le 6 Juin 2017
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
This will not remove an all-zero column unless the corresponding row is also empty
chocho le 6 Juin 2017
@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!

Connectez-vous pour commenter.

### Catégories

En savoir plus sur Logical dans Help Center et File Exchange

### Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!