How to refer a high dimension matrix

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Shichu Zhu
Shichu Zhu 2015-7-7
编辑： Stephen23 2015-7-8
I have a high dimensional matrix A, two row vectors ind1 and ind2. The length of ind1 and ind2 is flexible but
length(size(A))==length(ind1)+length(ind2)
is always true. So how can I refer to the element of A whose index is (ind1(1),...ind1(end),ind2(1),...ind2(end))? Since the length of ind1 and ind2 is flexible, I couldn't simply write out every index.

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Stephen23
Stephen23 2015-7-7
编辑：Stephen23 2015-7-7
This is exactly what sub2ind is for, it generates the linear indices corresponding to subscript indices. Try doing something like this (untested):
ids = num2cell([ind1,ind2]);
idx = sub2ind(size(A),ids{:});
A(idx) % access that element
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Shichu Zhu
Shichu Zhu 2015-7-8
I see. ids{:} is equivalent to typing out every element of it explicitly,
ids{1},ids{2},ids{3},....ids{end}
which is exactly the index for reference!

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