search in data structure type

Question

Sososasa 2014-4-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/124419-search-in-data-structure-type

评论： Jos (10584) 2014-4-6

Hi, I have a struct type array:

subtree(1).Parent= [2 2 2]
subtree(1).Children= [1 2 3; 3 2 4]
subtree(2).Parent= [1 2 2]
subtree(2).Children= [1 2 3; 5 5 5]

My question is, if I know the Parent value=[2 2 2] and I don't know the subtree index, how can I find/search its children=[1 2 3; 3 2 4]? In another words how I can get the index of the subtree that contain Parent= [2 2 2]

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Jan 2014-4-4

It depends on how "parent value" and "its children" is defined. Are you looking for the subtree index of e.g. [2,2,2] or do you want to obtain all column values of the Children fields for all Parent values like 2? Please post a meaningful example.

Sososasa 2014-4-4

Are you looking for the subtree index of e.g. [2,2,2] ? Yes exactly, [2 2 2] is a parent and I want to get the children [1 2 3; 3 2 4]

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Answer 1

Jos (10584) 2014-4-4

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/124419-search-in-data-structure-type#answer_132154

在 MATLAB Online 中打开

TargetParent = [2 2 2] 
TF = arrayfun(@(k) isequal(subtree(k).Parent, TargetParent), 1:numel(subtree)) % logical indices
IDX = find(TF) % convert to linear indices

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Sososasa 2014-4-5

Oh thats really great answer. it turns out I have 2D structure subtree(i,j).Parent; subtree(i,j).Children How can I get i and j for the subtree if I know a Parent value ?