Extract fields from structure

Question

Samy Alkhayat 2022-8-14

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1779050-extract-fields-from-structure

评论： Dyuman Joshi 2022-8-15

Hello,

I have a structure A that includes 2 structures, B and C. I want to extract from structure "C" , to the workspace, specific fields that start with certain set of letter, i.e I want to extract fields that start wih XX_YY.

I did

S=[A.C(:)]; save('param.mat','-struct','S');

But the file takes forever to load to the workspace.

Thanks in Advance!

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Samy Alkhayat 2022-8-15

I actually not sure how to extract directly to workspace without saving to a variable and loading it.

Dyuman Joshi 2022-8-15

It is, as the answers below show

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Answer 1

Stephen23 2022-8-15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1779050-extract-fields-from-structure#answer_1026520

在 MATLAB Online 中打开

A.C.XX_YY1 = 5;
A.C.XX_YY2 = 10;
A.C.ZZ = 3;
B = A.C;
F = fieldnames(B);
X = startsWith(F,'XX_YY');
B = rmfield(B,F(~X))
B = struct with fields:
    XX_YY1: 5
    XX_YY2: 10

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Samy Alkhayat 2022-8-15

编辑：Samy Alkhayat 2022-8-15

Works! Thank you!

@Stephen23 any way to put the fields inside "B" into the workspace directly?

Stephen23 2022-8-15

"any way to put the fields inside "B" into the workspace directly?"

https://www.mathworks.com/matlabcentral/fileexchange/26216-structure-fields-to-variables

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

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Answer 2

Matt J 2022-8-14

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1779050-extract-fields-from-structure#answer_1026215

编辑：Matt J 2022-8-14

在 MATLAB Online 中打开

S.C.XX_YY1=5;
S.C.XX_YY2=10;
S.C.ZZ=3;
f=fieldnames(S.C);
I=startsWith(f,'XX_YY');
f=string(f(I));
for fI=string(f(I))'
    
    Extraction.(fI)=S.C.(fI);
    
end
Extraction
Extraction = struct with fields:
    XX_YY1: 5
    XX_YY2: 10