将 3D 元胞数组中的数据提取到 2D 矩阵中 - MATLAB

Question

我有一个三维元胞数组，即 16x10x3，我希望将 :,:,1 :,:,2 和 :,:,3 中的所有值分别提取到矩阵的列中.

我考虑过预先分配一个矩阵，然后运行一个基本循环，例如：

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

有没有更有效的方法来做到这一点而不必依赖循环？

编辑：:,:,1/2/3 之间有不同数量的值。

Answer 1

是时候进入 bsxfun 了！这是实现 -

%// 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{:}]

将 3D 元胞数组中的数据提取到 2D 矩阵中 - MATLAB

Extracting data from a 3D cell array into a 2D Matrix - MATLAB

arrays

matlab

matrix

cell-array