# HOW TO SOLVE 2 EQUATION ODE USING ODE45 IN MATLAB?

2 vues (au cours des 30 derniers jours)
emyleana adnan le 7 Juin 2021
My equation is
I need to solve it by using ODE45. I dont know how to put in my matlab coding since it have 2 equation.
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James Tursa le 7 Juin 2021
What have you tried so far? What specific problems are you having with your code? Have you looked at the examples in the ode45 doc for how to handle multiple equations?
emyleana adnan le 8 Juin 2021
This is what i have tried so far. It show me alot of error.
clear
clc
f = @(t,y) [y(1); 0.303*y(1)-0.557*y(1)^2+0.260*y(2)*y(1); y(2); 0.0345*y(2)-(1.18*(10^(-7))*y(2)^2)+(3.55*(10^(-14))*y(1)*y(2))];
y(1) = 0.0718;
y(2) = 0.225;
Y0 = [0.0718,0.225];
tspan = [0 5];
[T,Y] = ode45(f,tspan,Y0);
This is error that it state

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### Réponses (1)

Stephan le 8 Juin 2021
f = @(t,y) [0.303*y(1)-0.557*y(1).^2+0.260*y(2).*y(1);...
0.0345*y(2)-1.18e-7*y(2).^2+3.55e-14*y(1).*y(2)];
Y0 = [0.0718,0.225];
tspan = [0 5];
[T,Y] = ode45(f,tspan,Y0);
plot(T,Y)
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