MATLAB: Hi, everyone!

MATLABsignal processing

I need assistance, actually I have a matrix b=2500×21, which is imaginary part of a FRF signal. I want to find peaks for every column, each column represents accelerometer response at different location of a beam. The following code i have written.
for i=1:21
   pks(:,i)=findpeaks(b(:,i))
end
pks(:,i)=pks;
Problem is that, the matrix pks just stores last iteration value. I want that all the peak values after every iteration will be stored in a single matrix.
Can any body having suggestions?

Best Answer

As expected, your code returned the error
Unable to perform assignment because the size of the left side is 3-by-1 and the size of the right side is 6-by-1.
...because of reasons already listed multiple times in the comments.
You can solve this by storing the data in a cell array.
T=readtable('b.xlsx');
b=table2array(T);
pks=cell(21,1);
for i=1:21
   pks{i}=findpeaks(b(:,i))
end
pks =
21×1 cell array
    {6×1 double}
    {6×1 double}
    {6×1 double}
    {6×1 double}
    {7×1 double}
    {6×1 double}
    {5×1 double}
    {7×1 double}
    ...
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