Extracting non zero values from structure variable

Question

chandra Naik 2021-10-26

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https://ww2.mathworks.cn/matlabcentral/answers/1571713-extracting-non-zero-values-from-structure-variable

评论： Stephen23 2021-10-26

Suppose S is a structre variable with following zero and non-zero values , Then How do we extract only non-zero values from structure variable S.

s=100;
for i=1:s
    if (sensorCover(i))
        S(i).E=0.5;
        S(i).xd=xf(i)
        S(i).yd=yf(i)
        S(i).ir=ircount(i)
        S(i).cr=cf(i)
        
    else 
        S(i).E=0;
        S(i).xd=0;
        S(i).yd=0;
        S(i).ir=0;
        S(i).cr=0;
    end
    
end

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KSSV 2021-10-26

Question is not clear......what is sensorCover here?

chandra Naik 2021-10-26

SensorCover(i)---Please assume it as any test condition. Thank you

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Answer 1

Sulaymon Eshkabilov 2021-10-26

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https://ww2.mathworks.cn/matlabcentral/answers/1571713-extracting-non-zero-values-from-structure-variable#answer_816508

编辑：Sulaymon Eshkabilov 2021-10-26

在 MATLAB Online 中打开

Use logical indexing to take out non-zero values from a sturcture array, e.g.:

S.m(1) =0.1;  S.m(2:5)=0; S.m(6:9)=pi; S.k(1:3)=0; S.k(4:5)=-1;
S.m(S.m~=0)                % Non-zero values
ans = 1×5
    0.1000    3.1416    3.1416    3.1416    3.1416
S.k(S.k~=0)                % Non-zero values
ans = 1×2
    -1    -1

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Sulaymon Eshkabilov 2021-10-26

Most welcome!

Stephen23 2021-10-26

在 MATLAB Online 中打开

It is simpler to use NONZEROS:

S.m(1)   = 0.1;
S.m(2:5) = 0;
S.m(6:9) = pi;
S.k(1:3) = 0;
S.k(4:5) = -1;
nonzeros(S.m)
ans = 5×1
    0.1000
    3.1416
    3.1416
    3.1416
    3.1416
nonzeros(S.k)
ans = 2×1
    -1
    -1

Note that the original question showed a non-scalar structure with fields of scalar numerics, whereas the answer given above shows a scalar structure with fields of numeric vectors. These are clearly not the same thing.

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