MATLAB: Multiply each column of cell array by column vector

cellcell arraycell arrays

I have a 10×1 cell of separate events with each array having a size 384(time) x 5328(pixel). I want to multiply each column in each cell array by a column vector (C = 384×1). I have tried this code but it's not giving me the correct answer.
A = cell(size(B));
for jj = 1:10
  A{jj,1} = B{jj,1},[],1 .* C; 
end
Thanks

Best Answer

As per your previous question you would actually be better off keeping your data in a simple numeric array rather than a cell array, so the first thing we will do is to convert it to a numeric array. The solution is then trivial using bsxfun:
>> X = {[1,2,3;4,5,6],[0,2,4;6,8,10]};
>> Y = cat(3,X{:})
Y(:,:,1) =
   1   2   3
   4   5   6
Y(:,:,2) =
    0    2    4
    6    8   10
>> C = [2;5]
C =
   2
   5
>> bsxfun(@times,C,Y)
ans(:,:,1) =
    2    4    6
   20   25   30
ans(:,:,2) =
    0    4    8
   30   40   50
This uses efficient vectorized code:
http://www.mathworks.com/help/matlab/matlab_prog/vectorization.html
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