Indexing high dimension elements from a N-D matrix

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Junhong YE
Junhong YE 2014-5-28
评论： Matt J 2014-5-28
Hi, all,
I met a problem when I was trying to index the third dimension elements of a 3-dim matrix, i.e.
A=rand(10,10,10);
B=A(1,1,:);
, I found B was not a vector as I expected, but rather, a 1-by-1-by-10 array. But A(:,1,1) and A(1,:,1) return a column and row vector respectively.
I wonder why MATLAB is designed in this way and how to obtain what I want ?
I know a workaround is use squeeze(A(1,1,:)), which ignores the singleton dimensions. Is there any other more direct way?
Thanks.
  1 个评论
Matt J
Matt J 2014-5-28
I wonder why MATLAB is designed in this way
As you already pointed out, A(:,1,1) and A(1,:,1) are not the same shape and have singleton dimensions where you provided singleton subscripts. If that makes sense to you, why should A(1,1,:) obey a different rule?

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Matt J
Matt J 2014-5-28
B(1:10)=A(1,1,:)

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