MATLAB: How to define simultaneous equations for ODE45

MATLABode45

Suppose I have equations
I understand I write
f=@(t,x,a)[x(1)+x(2),x(1)-a*x(2)]
But I hope to define equations one by one f1 and f2 and then combine into f. Please advise.

Best Answer

f1 = @(t,x)  x(1) + x(2)
f2 = @(t,x,a) x(1)-a*x(2)
F = @(t,x,a) [f1(t,x);f2(t,x,a)]
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