What exactly does TolCon do and how is relative max(constraint violation) calculated?

13 visualizzazioni (ultimi 30 giorni)
Dear all,
I have been googling my fingers off trying to find a complete description of how TolCon exactly influences an fmincon optimization. TolX and TolFun regard relative changes, relative to the previous step. So far so clear. But upon termination of fmincon, option.TolCon is compared to the relative max(constraint violation).
What does relative max(constraint violation) mean? How is it calculated? To what is it relative?
I'd be grateful for answers. I would not asking if had not been googling for a day.

Risposte (3)

Alan Weiss
Alan Weiss il 15 Mag 2012
Modificato: John Kelly il 19 Nov 2013
Tolerances are described here. Relative can mean relative to the value at the initial point x0. There are a variety of stopping criteria that are not 100% consistent from solver to solver, or from algorithm to algorithm, so there is no universal definition. Sorry.
Most exit messages these days contain the information on what caused the solver to stop. These are the "enhanced" exit messages in fmincon, fminunc, lsqnonlin, lsqcurvefit, fsolve, and maybe a few more that I am forgetting right now.
Alan Weiss
MATLAB mathematical toolbox documentation

genevois pierre
genevois pierre il 22 Ott 2012
hi, the link in "Tolerances are described here" is not set : could you arrange this ? Thank you.
  1 Commento
Alan Weiss
Alan Weiss il 22 Ott 2012
Sorry, the documentation changed under us. I just updated the links.
Alan Weiss
MATLAB mathematical toolbox documentation

Accedi per commentare.


ortegga
ortegga il 14 Apr 2017
You coded this with your ass

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by