Faster Method for removing duplicates

Question

Adam 2013-3-29

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/69054-faster-method-for-removing-duplicates

I am trying to remove duplicate nodes from an auto mesh. I have attached a simple script. This works, but takes FOREVER if there are many (greater than 10,000) nodes. Does anyone have an alternate suggestion that would be faster?

node = 
[0.1234 5.6789;
 3.4567 9.8765;
 4.5678 8.7654;
 0.1234 5.6789]
% Remove duplicate nodes
node_array=cell(1,length(node));
for j = 1:length(node)
  node_array(j,1) = {node(j,:)};
end
node_array_cat = cat(1,node_array{:});
[node junk node_map] = unique(node_array_cat,'rows');
node = 
[0.1234 5.6789;
 3.4567 9.8765;
 4.5678 8.7654]

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Answer 1

Cedric 2013-3-29

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/69054-faster-method-for-removing-duplicates#answer_80356

编辑：Cedric 2013-3-29

在 MATLAB Online 中打开

 >> node_u = unique(node, 'rows', 'stable')
 node_u =
    0.1234    5.6789
    3.4567    9.8765
    4.5678    8.7654

should be more efficient. What was the purpose of this conversion to cell array?

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Adam 2013-4-2

Thanks, I guess I should have been more specific. I need the node_map value as well. Regardless, I coded this a few years ago when I just started with MATLAB I am sure I found an example that was an array and just ran with it. You were correct, I did not need the array for my specific case and you have saved me much needed processing time. Thanks.

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