error in returning widths over iterated findpeaks

 Hi,

I am trying to use findpeaks over a matrix, x, column by column. I am using a for loop as below:

 

for k=1:size(x,2)
[P{k},locs{k},widths,proms{k}]=findpeaks(x(:,k))
end         

Everything is working fine except for returning widths. P, locs and proms all return as cell arrays with all the data for the peaks in each column. However, widths only returns the widths of the peaks for the last column. When I try to edit it by making widths return as a cell array:

for k=1:size(x,2)
[P{k},locs{k},widths{k},proms{k}]=findpeaks(x(:,k))
end    

I get the error message "Cell contents assignment to a non-cell array object"

 

Is there a way to get this function to return all the widths of all the peaks for each column?

ANSWER

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Hi,

 

I tried with the Release R2017b that is mentioned in question and with the latest Release that is R2019b but didn’t find any issues while running the code. Still I guess you may try pre declare the variables that are returned from findpeaks as below.

P = cell(1,size(deltaFoFCopy,2)); 
locs = cell(1,size(deltaFoFCopy,2)); 
widths = cell(1,size(deltaFoFCopy,2)); 
proms = cell(1,size(deltaFoFCopy,2)); 

Also, from the data file.....

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