why this line gives error?

Question

Sadiq Akbar ，2021-7-23

0

回答： Image Analyst ，2021-7-24

I have a code in which there is an error:

%% 
  % Range
  Range_hat(1) = Ranges(snapstart(1));
  Rangebin_hat(1) = RangeBins(Ranges == Range_hat(1));
  % DOA
  [betapks,DOAidx] = findpeaks(beta(snapstart(1),80:end)); % a possible DOA range is applied  1 ~ 101 degrees
  
  [betapks,id_temp] = sort(betapks,'descend');
  DOAidx = DOAidx(id_temp)+79;
  beta_pks(1) = betapks(1);
  DOA_hat(1) = theta(DOAidx(1));
    

After running , the above section gives the following error:

Index exceeds the number of array elements (0).

Error in DataA_main1 (line 220)

beta_pks(1) = betapks(1);

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Answer 1

Yazan 2021-7-23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/884634-why-this-line-gives-error#answer_752539

编辑：Yazan 2021-7-23

It seems that the findpeaks function could not find a peak, so it returned an empty vector. Check your signal, or specify some parameters for findpeaks.

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Sadiq Akbar 2021-7-24

Thank you for your response. Yes you are right, but since my file is in GBs, so cannot upload it.

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Answer 2

Image Analyst 2021-7-24

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/884634-why-this-line-gives-error#answer_752999

Can't you crop out a portion of it that demonstrates the error and upload that?

What are these values? Put in this code after findpeaks()

sizeOfBeta = size(beta) % Don't use a semicolon
fprintf('snapstart(1) = %f.\n', snapstart(1));
if isempty(betapks)
    fprintf('There were no peaks found!\n');
    uiwait(warndlg('There were no peaks found!'));
end