how to remove the repetitive elements from a structure

2019 4 20
1 个回答
更新时间：2019 4 21
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0 个投票

>> a = struct('position', {[200 300 1],[300 200 1],[250 250 0.5],[230 280 0.6],[300 200 1],[270 150 1]}, 'cost', {[50;90],[60;80],[65;89],[60;70],[60;80],[55;85]})
I have a structure with two fields, I need to two remove the duplicates?
I tried useing the code below but it did not work.
[~, idx] = unique([a.position].', 'rows', 'stable'); %stable optional if you don't care about the order.
a = a(idx)
I hope I can find a sulotion for this problem.

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回答（1 个）

Stephen23
Stephen23 2019-4-21
编辑：Stephen23 2019-4-21

0 个投票

Data:
>> a = struct('position', {[200 300 1],[300 200 1],[250 250 0.5],[230 280 0.6],[300 200 1],[270 150 1]}, 'cost', {[50;90],[60;80],[65;89],[60;70],[60;80],[55;85]});
>> a.cost
ans =
50
90
ans =
60
80
ans =
65
89
ans =
60
70
ans =
60
80
ans =
55
85
Then remove duplicates:
N = numel(a);
X = false(1,N);
for ii = 2:N
Y = false;
for jj = 1:ii-1
Y = Y || isequal(a(ii),a(jj));
end
X(ii) = Y;
end
a(X) = []
Giving (fifth element has been removed):
>> a.cost
ans =
50
90
ans =
60
80
ans =
65
89
ans =
60
70
ans =
55
85

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khalil alkebsi
khalil alkebsi 2019-4-21
Thank you so much Stephen, I appreciate your time answering my question, and i found it so helpful.
Related to this question I would like to ask; what if there are repetitive elements in only one filed of the structure but no repetition in the other. Would it be easy to delete the duplicated element with its corresponding element from the other field?
a = struct('position', {[200 300 1],[300 200 1.5],[250 250 0.5],[230 280 0.6],[300 200 1],[270 150 1]}, 'cost', {[50;90],[60;80],[65;89],[60;70],[60;80],[55;85]});
khalil alkebsi
khalil alkebsi 2019-4-21
alright, I think I found the answer,
N = numel(a);
X = false(1,N);
for ii = 2:N
Y = false;
for jj = 1:ii-1
Y = Y || isequal(a(ii).cost,a(jj).cost);
end
X(ii) = Y;
end
a(X) = []
thank you

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