how to get struct array field as a vector?

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Mr M.
Mr M. 2015-10-12
回答： Tin Aye Chit Chit 2019-5-15
I have a struct array, and a field like data.age and I want to get the ages as a vector v for which I can write for example : v(v>18), because data.age(data.age>18) gives me an error message.

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采纳的回答

Thorsten
Thorsten 2015-10-12
age = [data.age];
agegt18 = age(age>18);

更多回答（2 个）

Walter Roberson
Walter Roberson 2015-10-12
v = [data.age];
data(v>18)
Or more compactly,
data([data.age]>18)
  2 个评论
Mr M.
Mr M. 2015-10-12
Thanks, and what if the filed contains strings, and I want to select elements for which string equals to a given string? Something like this: data({data.gender}=='male')

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Tin Aye Chit Chit
Tin Aye Chit Chit 2019-5-15
Please check the code, that code can't give me the answer I want.
for i = 1:1:n
V=index{i};
for j = 1:1:size(V,2)
S{i,j}.e = nodeArch.node(V(1,j)).energy;
S{i,j}.t = nodeArch.node(V(1,j)).type;
S{i,j}.g = nodeArch.node(V(1,j)).G;
end
end
The S have more column than V. What is wrong in that code?

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