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How do you iterate over multiple fields in a structure?

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Anwesh Saha
Anwesh Saha 2023-1-21
编辑： Stephen23 2023-1-21
I have a 1X1 struct with 48 fields in it. Each field is 1X5120 int 32. I want to downsample each of these fields using the downsample(y, n) function.
However, I would like to accomplish this using a loop. How can it be done?
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Stephen23
Stephen23 2023-1-21
编辑：Stephen23 2023-1-21
You could make this task easier by improving the data design.
Numbered fieldnames (or variable names) like that is usually a sign that you are doing something wrong.
Rather than forcing meta-data (e.g. pseudo-indices) into the fieldnames like you are doing, your data would be much better stored in a non-scalar structure or a simple cell array. Then you can use basic indexing to loop over the data.

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Stephen23
Stephen23 2023-1-21
编辑：Stephen23 2023-1-21
One approach is to use FIELDNAMES() and dynamic fieldnames:
https://www.mathworks.com/help/matlab/matlab_prog/generate-field-names-from-variables.html
For example, where S is your scalar structure:
n = 5;
C = fieldnames(S);
for k = 1:numel(C)
F = C{k};
A = S.(F);
B = downsample(A,n);
S.(F) = B;
end
Another simple option is to use STRUCTFUN():
https://www.mathworks.com/help/matlab/ref/structfun.html
For example:
n = 5;
fnh = @(v) downsample(v,n);
S = structfun(fnh, S)

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