Align signals of different length using Peak

Question

Ganesh Naik 2022-7-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1754960-align-signals-of-different-length-using-peak

评论： Ganesh Naik 2022-7-7

my_arrays.mat

Hi all, I have set of signals of varying length stored in a cell array. I would like to align them based on their peaks. I have tried using matlab function "alignsignals" as well but no luck with it due to the varying datasize. I have added the data and my effort below. Any help in this regard is highly appreciated.

figure();
hold on;
for i = 1:length(my_arrays)
    T = (my_arrays{i});
    [Pks,Locs] = findpeaks(T,'MinPeakHeight',100)
    plot(T);
end

Another effort (gives error due to varying datalength)

[r,c] = size(my_arrays)
disp(my_arrays);
for i = 2:c
    Aligned_curves(:, i-1) = alignsignals(my_arrays{1:r, i-1}, my_arrays{1:r, i}, []);
end
figure;
plot(Aligned_curves);

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

KSSV 2022-7-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1754960-align-signals-of-different-length-using-peak#answer_1001910

编辑：KSSV 2022-7-7

在 MATLAB Online 中打开

According to the plot, the peak value which has longest id is third array. So, I would allign signals w.r.t to third array.

load('my_arrays.mat') ;
N = length(my_arrays) ; 
% Get maximum and id of each signal
val = zeros(N,1) ; 
id = zeros(N,1) ;
for i = 1:N
    [val(i),id(i)] = max(my_arrays{i}) ;
end
% Get the id of signals which has longest maximum id 
[~,T] = max(id) ; 
X = my_arrays{T} ; 
Y = cell(N-1,1) ; 
figure();
hold on;
plot(X)
for i = 1:length(my_arrays)-1
    if i~=T
        [~,Y{i}] = alignsignals(X,my_arrays{i})    ; 
        plot(Y{i});
    end
end
Y{T} = X ; 

3 个评论
显示 1更早的评论隐藏 1更早的评论

KSSV 2022-7-7

Yes that can be done. I have edited the code, so that T = 3, is automatically picked up.

You may have a look on id to see what do I mean longest max index.

Ganesh Naik 2022-7-7

Dear KSSV thanks, I am going to accept this answer. Since the data is of varying length is it possible to compute average of data (ensemble average) and plot the average data as a thick line in the plot?

Kind regards

请先登录，再进行评论。