how do I select every single element of matrix except middle
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Say for example I have a 3 by 3 matrix
[1,2,3;4,5,6;7,8,9]
How do I select every element of the matrix except for the middle element?
2 个评论
David Young
2015-1-16
What do you mean by "select"? In other words, what operation are you going to carry out on the non-central elements?
回答（1 个）
If I understand you correctly, you could do something like this:
A(A~=A(ceil(numel(A)/2)))
or
setdiff(A,A(ceil(numel(A)/2)))
Assuming you always have an odd number of elements these approaches should work.
Considering your edit, you could do it like this:
B = A([1:ceil(numel(A)/2)-1, ceil(numel(A)/2)+1:end]) * whatever;
Or, keeping it within A;
A([1:ceil(numel(A)/2)-1, ceil(numel(A)/2)+1:end]) = ...
A([1:ceil(numel(A)/2)-1, ceil(numel(A)/2)+1:end]) * whatever;
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