"Frank " <email@example.com> wrote in message <firstname.lastname@example.org>... > Hello. I have a matrix equation problem. > > Ax = b, |x_i| = 1 > > where the dimensions of the complex matrices A, x, b are (M-2)-by-M, M-by-1 and (M-2)-by-1, respectively. The problem has a constraint that all elements of x should have magnitude 1. > > How can I solve this problem? > Is the solution unique? > > Thanks a lot.