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Searching data inside struct fields ?

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Mohammed kandeel
Mohammed kandeel 2018-1-20
评论： Mohammed kandeel 2018-1-20
I have struct and i need i need to search inside it how can i make this ? let's say i have struct contains fields ID, name and class i need when i get ID from user not accept it if it's found before.
Thanks In advance.

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回答（1 个）

Walter Roberson
Walter Roberson 2018-1-20
if ismember(proposed_id, {structname.ID})
It was a duplicate
else
It did not occur before
end
If the ID are numeric change from {} to []
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Stephen23
Stephen23 2018-1-20
编辑：Stephen23 2018-1-20
This code
class.ID=1;
class.ID=2;
class.ID=3;
simply overwrites the field ID with each line, and so defines just one single scalar structure with one field. It is equivalent to:
class.ID=3;
What are you actually trying to achieve? You might need to read about non-scalar structures:
https://www.mathworks.com/help/matlab/matlab_prog/access-multiple-elements-of-a-nonscalar-struct-array.html
Mohammed kandeel
Mohammed kandeel 2018-1-20
It's working my Bro its should be like this it's my fault.
class(1).ID=1;
class(2).ID=2;
class(3).ID=3;

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