About the usage of for, while and return

Question

sermet OGUTCU 2020-5-19

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/526585-about-the-usage-of-for-while-and-return

编辑： dpb 2020-5-19

I need to perform while loop many times as follows;

data=xlsread('data.xlsx','B1:B86640');
% first part
i_1=1;
while (abs(data(1)) > 0.10 || abs(data(2)) > 0.10 || abs(data(3)) > 0.10)
  i_1=i_1+1;
  if i_1==361;
    errordlg('iteration cannot be converged', 'Error!', 'modal')
    return   
  end
end
% second part
i_2=1;
while (abs(data(362)) > 0.10 || abs(data(363)) > 0.10 || abs(data(364)) > 0.10)
  i_2=i_2+1;
  if i_2==361;
    errordlg('iteration cannot be converged', 'Error!', 'modal')
   return  
  end
end
%third part
i_3=1;
while (abs(data(723)) > 0.10 || abs(data(724)) > 0.10 || abs(data(725)) > 0.10)
  i_3=i_3+1;
  if i_3==361;
    errordlg('iteration cannot be converged', 'Error!', 'modal')
    return  
  end
end

After these excecutions, I need to store i_1, i_2 and i_3 arrays.

% for all abs(data(xx)) parts, xx equals to array of 1:361:86280;

How can I execute the above steps avoiding the repeated parts using a single part of different codes?

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sermet OGUTCU 2020-5-19

@dpv, yes, the calculations for the sections the same just testing the different area within the data array.

dpb 2020-5-19

In that case, just write an indexing vector and group the entire lot---

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Answer 1

dpb 2020-5-19

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/526585-about-the-usage-of-for-while-and-return#answer_433460

编辑：dpb 2020-5-19

在 MATLAB Online 中打开

With the clarification that operations are the same, then

data=xlsread('data.xlsx','B1:B86640');
% preliminaries -- define stopping criteria data points
N=2;                            % number consecutive points from 
IDX=[1:361:723];                % starting points
TOL=0.10;                       % tolerance
idxvec=cell2mat(arrayfun(@(ix) colon(ix,ix+N),IDX,'UniformOutput',false)); % expand indices to vector
MAXITER = 361;
iter=0;
while any(abs(data(idxvec)>TOL)
  iter=iter+1;
  if iter>=MAXITER
    errordlg('iteration cannot be converged', 'Error!', 'modal')
    return   
  end
  data=yourfunctionthatchangesdatagoeshere(iter,data);   %  do whatever it is need to do...
end