Why in Simulink a Matlab function block changes its output when changing the solver?
3 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Hello,
I have in Simulink a Matlab function block with some equations written inside.
The problem comes when I change the solver from ODE1 (Euler) to ODE4 (Runge-Kutta), always using fixed step time.
How come that I get different output values if the outputs are direct equations of the inputs? Should not be they the same independently of the solver I chose?
Here the code:
function x = fcn(T, A, B, u)
persistent x_1 u_1
if isempty(x_1)
x_1 = 0;
u_1 = 0;
end
x = x_1 + T * (A * x_1 + B * u_1);
x_1 = x;
u_1 = u;
Thanks!
0 commentaires
Réponses (1)
Azzi Abdelmalek
le 22 Avr 2016
Modifié(e) : Azzi Abdelmalek
le 22 Avr 2016
It happens that Simulink gives different results for different solvers, especially when the type of equations it has to solve, requires an appropriate solver. Read how to choose a solver. http://www.mathworks.com/help/simulink/ug/types-of-solvers.html
0 commentaires
Voir également
Catégories
En savoir plus sur Event Functions dans Help Center et File Exchange
Produits
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!