ODE45 solving for three variables
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Hello
I am trying to solve for an ODE with
y1'=y2
y2'=y3
y3'=-24y1-26y2-9y3
y(0)=[1 -4 -14]
when I try to code it like this
dydt = [y(2); y(3); -24*y(1)-26*y(2)-9*y(3)];
an error appears
Index exceeds the number of array elements (1).
R_tilde = builtin('subsref',L_tilde,Idx);
I'm pretty new to this so sorry if this is a simple question
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Antworten (1)
Ameer Hamza
am 23 Okt. 2020
Bearbeitet: Ameer Hamza
am 23 Okt. 2020
You need to write as a function or a function handle
dydt = @(t, y) [y(2); y(3); -24*y(1)-26*y(2)-9*y(3)];
y0 = [1 -4 -14];
tspan = [0 10];
[t, y] = ode45(dydt, tspan, y0);
plot(t, y);
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