How to remove duplicate element from matrix ?

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I have duplicate matrix S, I need remove the repeated elements from S, and

then put the absent numbers at the end to generate a new matrix X. iI implement remove duplicate element but how we add absent element at the end?

S=[1 11 1 4 3 14 6 11 13 11 7 15 5 9 9 7];

C=unique(S);

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Image Analyst 2021-12-30

That's not a matrix. That's a vector.

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Answer 1

Voss 2021-12-30

编辑：Voss 2022-1-1

在 MATLAB Online 中打开

1 个投票

Here's one way:

S=[1 11 1 4 3 14  6 11 13  11 7 15  5 9 9 7]
S = 1×16
     1    11     1     4     3    14     6    11    13    11     7    15     5     9     9     7
[C,i] = unique(S,'stable')
C = 1×11
     1    11     4     3    14     6    13     7    15     5     9
i = 11×1
     1
     2
     4
     5
     6
     7
     9
    11
    12
    13
C = [C S(~ismember(1:numel(S),i))]
C = 1×16
     1    11     4     3    14     6    13     7    15     5     9     1    11    11     9     7

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Arshub 2021-12-31

编辑：Arshub 2021-12-31

@Benjamin can you help me in this state:

I need to use C=[1 3 4 5 6 7 9 11 13 14 15 1 7 9 11 11]

as index to perform permutation of matrix A =[111 222 30 4;50 65 70 83; 10 27 39 40 ; 54 67 72 81 ] by this method:

Substitute A(Ci ) with A (CM×N−i+1).

here i = 1, 2,..., M × N/2.

then i need to make reverse operartion to get the original matrix.

I write the code but when I make reverse operation I coulden't get the original matrix "M" after permutation, Why?

What should I do to get original matrix from permutated matrix?

Note: it is immportant to me use "Substitute A(Ci ) with A (CM×N−i+1)."

to permutate matrix.

%-----------------------------------------------------my rest of code ---------------------------------

A =[111 222 30 4;50 65 70 83; 10 27 39 40 ; 54 67 72 81 ];

[row,col]=size(A);

len=row*col;

A=reshape(A,1,len);

for i =1:len/2

A(C(i))=A(C(len-i+1));% Substitute A(Ci ) with A (CM×N−i+1)., permutation matrix

end

Ab=reshape(A,row,col)

AA=reshape(Ab,1,len);

for i =1:len/2

AA(C(len-i+1))=AA(C(i));% reverse Substitute A (CM×N−i+1) with A(Ci ) to get original matrix

end

AA=reshape(AA,row,col)

Voss 2022-1-1

在 MATLAB Online 中打开

@Arshub I modifed my answer after seeing DGM's comment on your other question. I believe this answer is more what this question is looking for.

I recommend you update that other question to clarify the relationship between S and C, specifically that:

S=[1 11 1 4 3 14  6 11 13  11 7 15  5 9 9 7];
[C,i] = unique(S,'stable');
C = [C S(~ismember(1:numel(S),i))];

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