如何平均的阵列的单元阵列？ [英] How to average over a cell-array of arrays?

问题描述

我有同等大小的阵列的单元阵列 C ，即尺寸（C {N}）= [毫升...] 任何 N 。我怎样才能获得的意思是值（平均在单元格数组索引 N ）在一次扫描所有的数组元素呢？我想过使用 cell2mat 和的意思是，但前者不添加另一个维度，但变化→ 到→* N 。并手动循环当然需要像永远...

I have a cell array c of equal-sized arrays, i.e. size(c{n}) = [ m l ... ] for any n. How can I get the mean values (averaging over the cell array index n) for all array elements in one sweep? I thought about using cell2mat and mean but the former does not add another dimension but changes l to l*n. And looping manually of course takes like forever...

推荐答案

如果您所有的数组大小相同，它更有意义将它们存储在一个矩阵，而不是一个单元阵列。这使得它更容易地在它们之间执行操作，例如取平均值。您可以使用函数为ndims 并的CAT ：

If all of your arrays are the same size, it makes more sense to store them in a matrix rather than a cell array. That makes it easier to perform operations across them, like taking the mean. You can convert your data to a matrix using the functions NDIMS and CAT:

dim = ndims(c{1});          %# Get the number of dimensions for your arrays
M = cat(dim+1,c{:});        %# Convert to a (dim+1)-dimensional matrix
meanArray = mean(M,dim+1);  %# Get the mean across arrays

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