Generating more "edges" randomly

Question

Jonathan 2012-7-13

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/43594-generating-more-edges-randomly

I created the code below to generate a matrix (m) with two columns (edgeStart and edgeEnd) that contain 100 random integers each. These integers are the "nodes" and each "edge" is a tuple of two distinct nodes. The start nodes are in the first column, and the end nodes are in the second column. Right now, each start node corresponds to only one end node (ie. there are 100 nodes with 100 edges between them). Is there a way to create more edges (ie. with 100 nodes, have about 250 edges between them)?

clear all
edgeStart = zeros(100,1);
for nodeStart = 1:100
    edgeStart(nodeStart) = ceil(100.*rand(1));
    edgeStart = edgeStart';
end
edgeEnd = zeros(100,1);
for nodeEnd = 1:100
    edgeEnd(nodeEnd) = ceil(100.*rand(1));
    edgeEnd = edgeEnd';
end
m = [edgeStart,edgeEnd];
csvwrite('csvtest.csv',m)
type csvtest.csv

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Walter Roberson 2012-7-14

Please do not use "matlab" as a Tag. http://www.mathworks.co.uk/matlabcentral/answers/43073-a-guide-to-tags

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Answer 1

Jonathan 2012-7-14

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/43594-generating-more-edges-randomly#answer_53501

在 MATLAB Online 中打开

I figured it out myself. Here is the code:

clear all
numNodes = 100;
numEdges = 250;
edgeStart = zeros(numEdges,1);
for nodeStart = 1:numEdges
    edgeStart(nodeStart) = ceil(numNodes.*rand(1));
end
edgeEnd = zeros(numEdges,1);
for nodeEnd = 1:numEdges
    edgeEnd(nodeEnd) = ceil(numNodes.*rand(1));
end
sortedEdgeStart = sort(edgeStart,'ascend');
m = [sortedEdgeStart,edgeEnd];
dupCells = find(eq(sortedEdgeStart,edgeEnd))
duplicates = m(dupCells,:)
csvwrite('csvtest.csv',m)
type csvtest.csv