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# Any one can help me to check this code ?

Asked by Brwa on 25 May 2013
```A = [ 1 1 5; 2 1 6; 3 7 5 ];
```
```B = ones(3,3)
```
```S = eye(3,3)
```
```O = [2 7 6; 3 7 0]
```
`   for j = 1: 1: 3`
`      R = A(1:end,j)     % get 3 column vectors. therefore i will have 3 (R)'s`
`      C = B * R ;        % 3x1 vector`
`      D = [B*S ; O,B*C]`
```      H = [zeros(3,3); S]
end```

I have doubt about the value of C, does it change with j in the loop?

by the way C is a matrix, i can not write C(j) because i want to use the whole matrix (3x3) not just some specific values inside C.

If i need to change something, please let me know.

Thanks

## 1 Answer

Answer by Azzi Abdelmalek on 25 May 2013
Edited by Azzi Abdelmalek on 25 May 2013
Accepted answer

There is a small mistake, it should be O' instead of O,

```A = [ 1 1 5; 2 1 6; 3 7 5 ];
B = ones(3,3)
S = eye(3,3)
O = [2 7 6; 3 7 0]
for j = 1: 3
R = A(1:end,j)     % get 3 column vectors. therefore i will have 3 (R)'s
C = B * R ;        % 3x1 vector
D = [B*S ; O' B*C]
H = [zeros(3,3); S]
end
```

## 3 Comments

Brwa on 25 May 2013

yes, you are right about that, but my question is does loop can change the variavle C inside D for each value of j ? Or i need to write some thing like this C(j) or C(:,:,j) or any thing else ?

Azzi Abdelmalek on 25 May 2013

Yes C is changing every iteration, if you need to store each value of C , you can add in the loop

```C1{j}=C
```
Brwa on 26 May 2013

Thank you

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