On 5 Jun 2012, at 11:34, Lukas Reichlin wrote: > Well, the sign IS relevant. But the two state-space models are equivalent if > you can find a diagonal transformation matrix T with entries -1 and 1 such > that > > Aexp = T \ Aobs * T > Bexp = T \ Bobs > Cexp = Cobs * T > Dexp = Dobs > > I don't know which ATLAS routine returns different solutions and why. If > there is such a T, then the result is not wrong in the sense of control > engineering. > Using > assert (abs (Mo), abs (Me), 1e-4) > i just a crutchm, we should find and test T. > > BTW: M = [A, B; C, D
Thanks for the explanation. Are B and/or C above invertible? what are their sizes? c. ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Octave-dev mailing list Octave-dev@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/octave-dev
