从3D单元阵列为二维矩阵中提取数据 - MATLAB

Question

我有一个单元阵列是三维的，即16x10x3，我希望对于所有的值在:,:,1:,:,2和:,:,3要被提取到每个矩阵的一列。

我想到了预分配矩阵，然后只是运行一个基本的循环如：

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

是否有这样做，而不必依赖于一个循环的更有效的方法？

编辑：有不同数量的值之间：，：，1/2/3。

Answer 1

它的时候你进入bsxfun！这里的实现 -

%// 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{:}]