Split array into sub arrays and apply function

Hi everyone,

I am using findpeaks to detect peaks in my data and would like to create a sub arrays everytime a peak is detected and then apply a function to the sub arrays for example

If

x = [0.2954 0.0861 -0.0204 0.0046 0.2297 0.7651 -0.4482 -1.2974 0.3673 -0.7759 0.5676 1.0851 0.4082 0.3364 -0.3396 -0.1935 0.5228]

Peaks = [0.7651 0.5676 0.5228]

expected output / sub arrays = [{0.2954 0.0861 -0.0204 0.0046 0.2297 0.7651} {-0.4482 -1.2974 0.3673 -0.7759 0.5676} {1.0851 0.4082 0.3364 -0.3396 -0.1935 0.5228}

Thanks in advance

Regards,

Abigail

[Stephen23]

If you obtain findpeaks second output argument (the indices) your task will be a lot easier:

https://www.mathworks.com/help/signal/ref/findpeaks.html#bufbbs1-locs

Answer 1

[madhan ravi]

[lo, ii] = ismember(PeakS, x);
ix = diff([0, ii(lo)]);
Output = mat2cell(x, 1, ix)

[madhan ravi]

As Stephen comments if you use the second output of findpeaks() you replace ii(lo) in my code with the second output of findpeaks().

[Priscilla]

Thank you so much

Answer 2

[Parth Dethaliya]

x = [0.2954  0.0861  -0.0204   0.0046  0.2297 ...
    0.7651  -0.4482   -1.2974   0.3673  -0.7759 ...
    0.5676   1.0851   0.4082   0.3364   -0.3396  -0.1935   0.5228];    
Peaks = [0.7651 0.5676 0.5228];
SubArray=cell(1,size(Peaks,2));
Init=1;
for i=1:size(Peaks,2)
    SubArray{i} = x(Init:find(x==Peaks(i)));
    Init = find(x==Peaks(i))+1;
end

Seems the code is self-explanatory, still comment if you have any queries.

Hope it helps!!

[Priscilla]

Thank you