Hello all, I have to solve a system of linear equations, with a particular condition.

My system is in the classical form:

A*x=b

By the way I want that norm(x)=1.

So, I've thought, if I add to matrix A a final row x' I will obtain my condition, I explain in MATLAB code:

newA=[A;x']; newB=[b;1];

newA*x=newB

At this point I'm in the case that I've more equations than unknowns.

I can easily solve this problem with fmincon or other sort of non-linear solutor.
The problem is that now I have to invert newA (with pinv) which contains unknowns.

I was wondering if exists a more straigth forward method (maybe involving symbolic toolbox?) to avoid the use of a non-linear solutor of the problem.

Any hint?

Thank you.

I've tried to look about linprog or lsqlin, but seems that there is no way to find solution to this problem in this way.

Please see this thread:

http://www.mathworks.com/matlabcentral/newsreader/view_thread/263115

Bruno

"Bruno Luong" <b.luong@fogale.findmycountry> wrote in message <hseegc$lt0$1@fred.mathworks.com>...
> Please see this thread:
> 
> http://www.mathworks.com/matlabcentral/newsreader/view_thread/263115
> 
> Bruno

Thank you so much! I've tried to look in previous posts before I've posted, but I didn't find this one. Thank you very much.