Create new matrices based on the number of unique values

Question

Elysi Cochin 2022-5-13

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https://ww2.mathworks.cn/matlabcentral/answers/1718435-create-new-matrices-based-on-the-number-of-unique-values

回答： Stephen23 2022-5-14

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.

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Answer 1

Stephen23 2022-5-14

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https://ww2.mathworks.cn/matlabcentral/answers/1718435-create-new-matrices-based-on-the-number-of-unique-values#answer_963835

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

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Answer 2

Matt J 2022-5-13

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https://ww2.mathworks.cn/matlabcentral/answers/1718435-create-new-matrices-based-on-the-number-of-unique-values#answer_963230

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