"Conversion to cell from double is not possible"

I am trying to find features of EEG signals using TQWT. For finding the features of many columns I tried following code, yet I am getting the error:

Conversion to cell from double is not possible.

The code is:

for k = 1:9 filename = sprintf('F00%d.txt',k); a(:,k) = load(filename); temp = a(:,k); x = temp(2:length(a(:,k))); w = tqwt(x,1,3,3); [a1,a2,a3,a4] = deal(w{:}); a = {a1, a2, a3, a4}; for j = 1:4 H(k,j) = KraskovEntropyV2((a{j})', 2, 'euclidean'); j=j+1; end
end

What can I do about this error?

1 Answer

It seems that you have a cell in a{j} (a cell within a cell). you need to refer to the cell within. Presuming you only have one cell inside a{j} you can try:

H(k,j) = KraskovEntropyV2((a{j}{1})', 2, 'euclidean');