Matrix transform due to reorder of the equation row number, for AX=b

Hi,

I'd like to solve equation AX=b, e.g., [a11, a12, a13; a21, a22, a23; a31, a32, a33]*{x1, x2, x3}'={b1,b2,b3}'

However, I'd like to reorder X vector by {x2, x1, x3}', so is there any matlab code can do the row and column transform for matrix A?

Thanks.

[Azzi Abdelmalek]

David commented

i.e., is there any matlab code can get a transformation matrix B, then the transformed one can be calculated by C=A*B?

[Jan]

This is not clear.

[David Zhang]

I have to reorder elements of vector x and b, so rows and columns of A should be switched.

Answer 1

[Azzi Abdelmalek]

A= A(:,[2 1 3])
b=b([2 1 3])

[David Zhang]

Hi Azzi, it seems that your code is not correct.

[Azzi Abdelmalek]

Sorry

b should not change. just change

A= A(:,[2 1 3])

[David Zhang]

Yes, Azzi, Thanks for your kind help.

[David Zhang]

Hi Azzi, how A should be changed if elements of b should also be switched as b=b([2 1 3])

[Azzi Abdelmalek]

You change only A, but this time you change the rows order

A=A([2 1 3],:)