search in data structure type

2014 4 4
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更新时间：2014 4 6
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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
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
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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Jos (10584)
Jos (10584) 2014-4-4

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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
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 ?
Jos (10584)
Jos (10584) 2014-4-6
You can convert linear indices to subindices using IND2SUB
[i,j] = ind2sub(size(subtree),IDX)

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