one approach

Joe Riel — Sat, 27 Oct 2012 08:24:11 Z

There isn't necessarily a solution. Are the known matrices, A and E, numeric? If so, I'd try the following (assuming A and E are assigned)

R := Matrix(12, symbol=r):
eqs := convert(E.R.R^(%T).E^(%T) - A, set):
fsolve(eqs);

can't solve it in Maple

STHence — Sun, 11 Nov 2012 07:37:37 Z

Hi Joe,

Thank you for your help, and sorry for my delay reply.

Maple runs your code more than 15mins but can't give the solution. I also try to use "solve", but there is no solution yet.

In addition, the matrices E and A are attached in this message.