Trouble with For Loop

Question

Justin 2023-12-1

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https://ww2.mathworks.cn/matlabcentral/answers/2055084-trouble-with-for-loop

回答： Walter Roberson 2023-12-1

I am having trouble creating a for loop to repeat a set of code completed for 1 subject to the next 34 (in total 35 subjects). The data set has a row of ECG data per subject and it was extracted by dataN_1 = ecg_data (:,1). The data was later filtered and mean HR and RR intervals for the ECG were calculated for subject 1. How do I repeat everything but with different names e.g. mean_HR_subject1, mean_HR_subject2, etc. to calculate the mean and std for HR and HR variability for the 35 subjects?

Thank you!

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Answer 1

Torsten 2023-12-1

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移动：Torsten 2023-12-1

在 MATLAB Online 中打开

for i = 1:35
    dataN_(i) = ecg_data (:,i);
    mean_HR_subject(i) = ...
        ...
end

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Answer 2

Walter Roberson 2023-12-1

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If you need to compute different field names for a struct, or different property names for objects, you can use dynamic field names. It would look something like this,

for iteration = 1 : 35
    HRfield = "HR_subject" + iteration;
    mHRfield = "mean_" + HRfield;
    data_in = TheStruct.(HRfield);
    data_out = some calculation on data_in
    TheStruct.(mHRfield) = data_out;
end