# Create new matrices based on the number of unique values

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Elysi Cochin on 13 May 2022
Answered: Stephen23 on 14 May 2022
having a matrix
M = [4 7 2; 2 4 7; 2 2 4];
M =
4 7 2
2 4 7
2 2 4
based on the number of unique values (in this case 3), i want to create, 3 new matrices, and its value as follows, where all there is 2, in the first matrix, iall those places needs to be replaced with 1 and all the rest 0, same on taking the next unique number, replace all those places of 4 with 1 and the rest 0 in the second matrix and then next unique number Then I need to create new matrices based on the number of unique values and replace the ones in the matrix with the values in M and find the sum of the matrix and find the greatest matrix of its sum.
M = [4 7 2; 2 4 7; 2 2 4]; sum_M1 = 8;
sum_M1 = 12;
sum_M1 = 14;
so M3 is greatest and i need to get that 3rd unique value, that is 7.

Stephen23 on 14 May 2022
Those three matrices are a red-herring.
M = [4,7,2;2,4,7;2,2,4]
M = 3×3
4 7 2 2 4 7 2 2 4
[U,~,X] = unique(M(:));
S = accumarray(X,M(:))
S = 3×1
8 12 14
[~,Y] = max(S);
U(Y)
ans = 7

Matt J on 13 May 2022
M = [4 7 2; 2 4 7; 2 2 4];
x=reshape(unique(M),1,1,[]);
output=(M==x)
output = 3×3×3 logical array
output(:,:,1) = 0 0 1 1 0 0 1 1 0 output(:,:,2) = 1 0 0 0 1 0 0 0 1 output(:,:,3) = 0 1 0 0 0 1 0 0 0