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replace the rows of a matrix with binary digit values

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pavlos
pavlos 2014-2-15
回答： Azzi Abdelmalek 2014-2-15
Hello,
Consider the following matrix:
A=[ 1 1 1 1;2 2 2 2;3 3 3 3...]
The row sequence of 1 1 1 1, 2 2 2 2, 3 3 3 3 is repeating.
How can we change all the rows of
1 1 1 1 with 1 0 0 0
2 2 2 2 with 0 1 0 0
3 3 3 3 with 0 0 1 0
Thank you very much.
Best,
Pavlos

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Azzi Abdelmalek
Azzi Abdelmalek 2014-2-15
A=[ 1 1 1 1;2 2 2 2;3 3 3 3;2 2 2 2;3 3 3 3]
s=[1 0 0 0;0 1 0 0;0 0 1 0];
out=s(A(:,1),:)

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