從3D單元陣列中提取數據到2D矩陣-MATLAB

Question

我有一個三維數組，即16x10x3，我希望將:,:,1 :,:,2和:,:,3所有值分別提取到矩陣的一列中。

我考慮過預先分配一個矩陣，然后運行一個基本的循環，例如：

for m=1:3
mat(:,m) = ([a{:,:,m}]); 
end

有沒有一種更有效的方法，而不必依賴循環？

編輯：：，：，1/2/3之間有不同數量的值。

Answer 1

現在是時候進入bsxfun ！ 這是實現-

%// Get the number of elements in each column of the input cell array
lens = sum(cellfun('length',reshape(a,[],size(a,3))),1)

%// Store the maximum number of elements possible in any column of output array
max_lens = max(lens)  

%// Setup output array, with no. of rows as max number of elements in each column
%// and no. of columns would be same as the no. of columns in input cell array 
mat = zeros(max_lens,numel(lens))

%// Create as mask that has ones to the "extent" of number of elements in
%// each column of the input cell array using the lengths
mask = bsxfun(@le,[1:max_lens]',lens)  %//'

%// Finally, store the values from input cell array into masked positions
mat(mask) = [a{:}]