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## I want to extract half of the non-zero element of a matrix

Asked by BANI tita

### BANI tita (view profile)

on 14 Oct 2012

Hello, I have a matrix of the following form: [1,0,0,0;0,0,0,0;0,10,0,12;13,0,0,0], I need a mask that allows me to extract half of the data of each nonzero matrix of this form in this case for example I want the following result [1,0,0,0;0,0,0,0;0,10,0,0;0,0,0,0]

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## 2 Answers

Answer by Matt J

### Matt J (view profile)

on 14 Oct 2012
```idx=find(A);
```
```A(idx(2:2:end))=0;
```

BANI tita

on 14 Oct 2012

merci

### Andrei Bobrov (view profile)

Answer by Andrei Bobrov

### Andrei Bobrov (view profile)

on 14 Oct 2012
```ii = 1:fix(nnz(A)/2);
At = A';
jj = find(At);
At(jj(fix(nnz(A)/2)+1:end)) = 0;
out = At';
```

BANI tita

### BANI tita (view profile)

on 14 Oct 2012

merci bien

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