How do I get nested loops in a function?

Question

Inti Vanmechelen 2015-12-19

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/260992-how-do-i-get-nested-loops-in-a-function

评论： Inti Vanmechelen 2015-12-20

I'm trying to replace my for loops by functions to get a more efficient code, but I can't succeed to get nested loops in to a function.

For example for this part of the code:

for i = 1:10;
  EMGMax.(subjects{i}) = max(EMGMaxMotion.(subjects{i}));
  for k = 1:3;
    EMGNor.(subjects{i}).(motion{k}) = SmoothSignal.(subjects{i}).(motion{k})(:,2:21)/(EMGMax.(subjects{i}));
    TimePoints = size(SmoothSignal.(subjects{i}).(motion{k}),1);
    for t = 1:TimePoints
      EMGNor.(subjects{i}).(motion{k})(t,:) = SmoothSignal.(subjects{i}).(motion{k})(t,2:21)./(EMGMax (subjects{i}));
    end
  end
end

I succeeded to replace the first for loop by the function:

[EMGMax] = findEMGMax(EMGMaxMotion,subjects);

But if I try to replace the second for loop by this function:

function[EMGNor] = findEMGNor(SmoothSignal,subjects,motion,EMGMax)

Matlab says "subscript must be real positive integers of logicals", and I can't figure out how to solve this error.

I hope my question is clear!

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Answer 1

Walter Roberson 2015-12-19

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https://ww2.mathworks.cn/matlabcentral/answers/260992-how-do-i-get-nested-loops-in-a-function#answer_203781

When you moved the code into a function, does the function still refer to i ? If so then the i would not have a definition, and would default to being sqrt(-1) which is not a valid subscript.