MATLAB: Replace the rows of a matrix with binary digit values

matrix manipulationStatistics and Machine Learning Toolbox

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

Best Answer

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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