Extract fields from structure

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Samy Alkhayat
Samy Alkhayat on 14 Aug 2022
Commented: Dyuman Joshi on 15 Aug 2022
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!
  3 Comments
Dyuman Joshi
Dyuman Joshi on 15 Aug 2022
It is, as the answers below show

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Accepted Answer

Stephen23
Stephen23 on 15 Aug 2022
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

More Answers (1)

Matt J
Matt J on 14 Aug 2022
Edited: Matt J on 14 Aug 2022
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
  1 Comment
Samy Alkhayat
Samy Alkhayat on 15 Aug 2022
@Matt J it works except I get the error below:
The logical indices contain a true value outside of the array bounds.
Any advice?
Thanks in advance!

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