transforming a 2-dim array integers to 3-dim array of logical which are true for the corresponding number - without using a loop

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nobody
nobody 2018-10-22
编辑： nobody 2018-10-22
Hello,
I would like to take an 2-dim array like
IND=[4 3 2;
1 2 3];
and create a 3-dim of logicals like
GOAL(:,:,1)=[0 0 0 1;
1 0 0 0]
GOAL(:,:,2)=[0 0 1 0;
0 1 0 0]
GOAL(:,:,3)=[0 1 0 0;
0 0 1 0]
So the first second dimension is newly created, it is as long as the highest number in IND and is zero(false), except for the indice, that is 1(true)
I really need it to be fast, so a for loop will not do.
Many thanks Marcus

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Bruno Luong
Bruno Luong 2018-10-22
编辑：Bruno Luong 2018-10-22
IND=[4 3 2;
1 2 3];
[I,~,K] = ndgrid(1:size(IND,1),1,1:size(IND,2));
J = IND;
GOAL = accumarray([I(:),J(:),K(:)],1);
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