why this line gives error?
显示 更早的评论
I have a code in which there is an error:
%%
212 % Range
213 Range_hat(1) = Ranges(snapstart(1));
214 Rangebin_hat(1) = RangeBins(Ranges == Range_hat(1));
215 % DOA
216 [betapks,DOAidx] = findpeaks(beta(snapstart(1),80:end)); % a possible DOA range is applied 1 ~ 101 degrees
217
218 [betapks,id_temp] = sort(betapks,'descend');
219 DOAidx = DOAidx(id_temp)+79;
220 beta_pks(1) = betapks(1);
221 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);
回答（2 个）
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.
5 个评论
Sadiq Akbar
2021-7-23
Yazan
2021-7-23
How what?
Sadiq Akbar
2021-7-23
Image Analyst
2021-7-23
@Sadiq Akbar, here is another chance to read the posting guidelines:
or you can click the Community Guidelines link on this page.
When you do you'll notice that one thing it says to do is to attach your data so people can help you -- something you have not done yet (so that's how I know you didn't read the guidelines). After you do, people will see your signal (if you also post a screenshot of it plotted) and will be able to help you more and better.
save('answers.mat', 'Ranges', 'theta', 'snapstart');
Sadiq Akbar
2021-7-24
Image Analyst
2021-7-24
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
What do you see?
类别
在 帮助中心 和 File Exchange 中查找有关 Linear Predictive Coding 的更多信息
2021-7-23
2021-7-24
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
