numjac on a subset of variables
47 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
I want to calculate the numerical Jacobian of my system using numjac.
It works fine with the regular syntax:
[Jac, FAC] = numjac(@(t,y)model(t,y,X,VAR),ttot,ytot',dydt,jac_tol,FAC);
However I don't need the full jacobian, but only the derivatives with respect to some y's. I can calculate the full one then select the needed lines, but it is a waste of computational time. How can I calculate the jacobian only where I need it?
0 commentaires
Réponses (1)
Vinh Nguyen
le 2 Mai 2017
I think you can do that by providing the Jacobian Structure. You can set the Jacobian Structure element 0 or 1. 1 for the derivatives respective to your variables you need.
0 commentaires
Voir également
Catégories
En savoir plus sur Systems of Nonlinear Equations dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!