Logical indexing with matrix issue
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I ran into this issue writing a program using logical indexing. Suppose you have
A=ones(32,10);
M=zeros(32,10);
N=ones(1,10);
for i=1:32;
M(i,:)=N;
end
M=logical(M);
C=A(M);
Why is C a 320x1? Shouldn't it be equal to A since the logical is all 1's? Thanks, Charles
采纳的回答
This is the intended behavior of Logical indexing. For example,
A = [1 2; 3 4];
Then, A(logical([1,1;1,1])) will return A(:), which is equal to
[1;
3;
2;
4].
And A(logical([1,0;0,1])) will return
[1;
4]
You can find more examples via the following link
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