Problem with input of ode113
6 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
I'm trying to run a very simple ODE. However when running it Matlab shows me the error: 'Index in position 1 exceeds array bounds (must not exceed 1)' for I_2 in the QIF function.
My code is posted below:
I_1= pi^2;
I_2= -2*pi^2;
params.tau= 10;
g= 0;
V_1= -65;
V_2= -65;
state= [V_1;V_2];
I= [I_1;I_2];
options = odeset('abstol',1e-8,'reltol',1e-8);
[t,state] = ode113(@QIF,[1 3000],state,I,params)
With QIF :
function [statep]= QIF(t,state,I,params);
I_1= I(1);
I_2=I(2);
v= (state(1)+state(2))/length(state);
V_1d= ((state(1)^2)+ I_1)/params.tau;
V_2d= ((state(2)^2)+ I_2)/params.tau;
statep= [V_1d,V_2d]
Does anyone see what I don't see?
0 commentaires
Réponse acceptée
Stephan
le 2 Déc 2019
I_1= pi^2;
I_2= -2*pi^2;
params.tau= 10;
g= 0;
V_1= -65;
V_2= -65;
state= [V_1;V_2];
I= [I_1;I_2];
options = odeset('abstol',1e-8,'reltol',1e-8);
[t,state] = ode113(@(t,state)QIF(t,state,I,params),[1 10.8],state,options);
plot(t,state)
function statep= QIF(~,state,I,params)
I_1= I(1);
I_2=I(2);
V_1d= ((state(1)^2)+ I_1)/params.tau;
V_2d= ((state(2)^2)+ I_2)/params.tau;
statep = [V_1d;V_2d];
end
For t>10.84627 your function gives a warning due to the extreme rise of the resulting values. Maybe you should check if your implementation is correct.
3 commentaires
Stephan
le 2 Déc 2019
Sounds like you might want to use ode events to tackle this. In the given link there is an example of a jumping ball - i suspect this is the kind of thing you want to do.
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Ordinary Differential 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!