Multidimensional array: how to extract several dimensions at same time?

2017 7 3
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更新时间：2017 7 3
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Hi all,
Imagine there is a 4d array like this:
arrayA = rand(5, 4, 3, 2);
Now I need a new arrayB which contains all elements of dimension 1, 2, 4 and only first elements of dimension 3, such that the new array is:
size(arrayB)
ans =
5 4 1 2
how can I do this?

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