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Re: diff eq
Posted:
Apr 8, 2013 2:21 AM


"richard " <richard7893@embarqmail.com> wrote in message <kjrsih$mgb$1@newscl01ah.mathworks.com>...
> > this is what I am typing into MATLAB: > function dx = system_ex(t,x) > dx = zeros(4,1); > dx(1) = 2.4712*x(1) + 0.005*x(2) + 0.56*x(3)+ 0.1*x(4); > dx(2) = 0.385*x(1)  0.1002*x(2) > dx(3) = 0.002*x(2)  0.6462*x(3) > dx(4) = 0.007*a(2)  0.2042*x(4) > [T,X] = ode45(@systems_ex,[0 10],[1 0 0 0]) > plot(t,x(:,1)) >
I hope you save system_ex in an mfile and call ode45 on another mfile. You seem to put everything in the same mfile.
Bruno



