Matrix Indexing

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Joerg
Joerg il 4 Feb 2011
I have an index matrix.
idx = [1 5 ; 3 7 ]
The goal is to get a matrix like this:
1 0
0 0
0 1
0 0
1 0
0 0
0 1
Indexing the matrix like
a(idx) = 1;
doesn't work. Right now I use a loop, but I am not sure if this is the best way.

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Matt Fig
Matt Fig il 4 Feb 2011
A = zeros(max(idx(:)),size(idx,1));
A(sub2ind(size(A),idx,cumsum(ones(size(idx))))) = 1

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