How to prevent automatic cell array dimension assignment

I want to generate a 3D cell array called timeData so that timeData(:,:,a) for some integer a is an nx1 matrix of data, and the number of rows n varies with the value of a in a 1:1 correspondence. To do this, I am generating a 2D array of data called data that is nx1. This assignment statement takes place within a for loop as follows:

for m=1:numIter  

data = [1.1;2.3;5.5;4.4]; % This is one example of what data could be. Its number of columns, n, changes each 
                          % iteration, as do its contents.

A = [1,2,3,4,5];
sizeA = size(A);
for k=1:sizeA(2)

     B = size(data);
     timeData(1:B(1),1,m) = num2cell(data);

end
end

This code does put all contents of data in the appropriate locations within timeData as I want. However, it also adds

{0x0 double }

rows to all 2D arrays of

timeData(:,:,a)

for any a whose corresponding number of rows n was not the largest number of rows. Thus, there are many of these 2D arrays that have 10s to a couple hundred 0 valued rows that I don't want. How can I modify my assignment statement to fix this?

PS: I understand the way I am going about dynamically changing the size of timeData is considered bad practice. I'm not concerned with this since all that matters to me is that the code works.