Graphviz for Matlab：删除没有边的节点

Question

我正在使用Graphviz for matlab。有一种方法可以删除最终图中没有边缘的节点，因为我的图形非常大（~9100个节点）以及以更好的方式表示图形的任何其他帮助不胜感激。

Answer 1

graphviz的输入为adjacency matrix，因此您可以执行以下操作：

% Generate random adjacency matrix with no nodes connected to themselves
N = 10; 
adj = (randi(N, N) > 5) .* (ones(N) - eye(N));

% Spuriously set one row and column to zero: no connections for this node
adj(:, 2) = 0; adj(2, :) = 0;

% Find the nodes with no edges
noEdgeNodes = all(adj == 0, 1) & all(adj == 0, 2)'

noEdgeNodes =

 0     1     0     0     0     0     0     0     0     0

% Remove nodes with no edges
adj(noEdgeNodes, :) = []; 
adj(:, noEdgeNodes) = [];

% Call graphviz
graphViz4Matlab('-adjMat', adj, '-nodeLabels', ...
    arrayfun(@(x){num2str(x)}, 1:size(adj, 1)))