Matt J
Posts:
4,997
Registered:
11/28/09


Re: Solving equation
Posted:
May 24, 2012 3:44 PM


"Frank " <allinone_2003@yahoo.com.hk> wrote in message <jpkoit$p1i$1@newscl01ah.mathworks.com>... > > > Is the solution unique? ============
Without the constraints x_i=1, the solution will always be nonunique, because an (M2)byM can never be fullcolumn rank.
Even with the constraints, though (and assuming you're looking for a least squares solution), the solution can be nonunique. As a simple example, take A=eye(M2,M) and b=zeros(M2,1). All x satisfying the constraints are solutions in this case.

