Matlab-访问多维数组的一部分 [英] Matlab - Accessing a part of a multidimensional array

问题描述

我正在尝试访问Matlab中多维数组的一部分-可以这样完成:X(2:3, 1:20, 5, 4:7) 但是，元素的数量和范围都不是固定的，因此我想提供数组的索引-对于上面的示例，它们应该是

I'm trying to access a part of a multidimensional array in Matlab - it could be done like this: X(2:3, 1:20, 5, 4:7) However, neither the number of elements, nor the ranges are fixed, so I want to provide the indices from arrays - for the above example they'd be

ind1 = [2 1 5 4];
ind2 = [3 20 5 7];

对于固定数量的尺寸，这不是问题(X(ind1(1):ind2(1),...)，但是由于不是这样，所以我不确定如何在Matlab中实现此方法.有没有办法?还是应该以不同的方式来对待?

For a fixed number of dimensions this is not a problem (X(ind1(1):ind2(1),...), but since they are not I'm not sure how to implement this in Matlab. Is there a way? Or should I approach this differently?

推荐答案

使用

Using comma separated lists you can make it a more quick and friendly:

% some test data
ind1 = [2 1 5 4];
ind2 = [3 20 5 7];
X = randi(99,20,20,20,20);

% get all subscripts in column format
vecs = arrayfun(@colon,ind1,ind2,'un',0);
% extract the values
result = X(vecs{:});

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