从单元阵列中的每个单元中提取特定元素 [英] Extracting a specific element from each cell within cell array

问题描述

我有一个大小为10x10的单元格数组A(例如).每个单元格依次包含一个5x20矩阵.我想从每个单元格中选择(i,j)元素，其中(i,j)是循环内的索引.我可以运行4个for循环并轻松获得答案. 可能甚至更快，因为已经多次讨论了循环可能比cellfun，structfun等更快.

I have a cell array A of size 10x10 (say). Each cell in turn contains a 5x20 matrix. I want to select (i,j) element from each cell, where (i,j) are indices within a loop. I can run 4 for loops and easily get the answer. It may even be faster as it has been discussed many times that loops could be faster than cellfun, structfun etc.

仍然，有没有使用cellfun的解决方案，可以在(i,j)上循环使用，并提取每个单元格中的(i,j)元素?我尝试编写一个函数来充当cellfun的句柄，但无法向下访问两个级别，即A{eachCellRow,eachCellCol}(i,j).

Still, is there any solution using cellfun which I can use in a loop over (i,j) and extract (i,j) element in each cell? I tried writing a function which will act as handle to cellfun but I couldn't access two-leves down i.e. A{eachCellRow,eachCellCol}(i,j).

示例: 如果A={[1 2;5 6], [3 4; 6 7]; [3 4; 6 7], [9 8; 5 6]};

然后i=1, j=1 and i=2, j=1输出应为:

B=[1 3; 3 9] and B=[5 6; 6 5]

推荐答案

CELL2MAT 将所有仅包含数字数据的单元格数组中的数据获取到数字数组中.因此，这对我们有帮助.对于您的原始问题，请尝试以下操作-

CELL2MAT gets all the data from a cell array that consists of numeric data only, into a numeric array. So, that helped us here. For your original problem, try this -

celldim_i = 10;
celldim_j = 10;

block_size_i = 5;
block_size_j = 20;

search_i = i; %// Edit to your i
search_j = j; %// Edit to your j

A_mat = cell2mat(A);
out = A_mat(search_i+block_size_i*(0:celldim_i-1),search_j+block_size_j*(0:celldim_j-1))

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