How to get back the original matrix?
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Torsten
2022-3-25
A = [1 2 3 2;...
4 1 2 3;...
3 4 3 2;...
2 4 1 1]
R = [1 3 4 2];
B = A(R,:);
Rinv(R) = 1:numel(R);
A_recovered = B(Rinv,:)
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Chunru
2022-3-25
A=[1 2 3 2;4 1 2 3;3 4 3 2;2 4 1 1];
% Reordering the rows of A is reversible
R=[1 3 4 2];
B=A(R,:);
% Straightening up the matrix into vector is also reversible
C=B(:)';
% Picking up part of the data is not reversible
D=[1 0 0 1 0 1 0 1 0 1 0 0 1 1 0 1];
E=C(D==1);
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