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2Â¥: Originally posted by wurongjun at 2016-02-12 20:15:52
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function dydt=abc(t,y)
dydt=[y(1);10-0.83*y(1)-400*y(2)]

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>> [t,y]=ode45('abc',[0 20],[0;0.5])
??? Error using ==> feval
Undefined command/function 'abc'.

Error in ==> funfun\private\odearguments at 110
f0 = feval(ode,t0,y0,args{:});   % ODE15I sets args{1} to yp0.

Error in ==> ode45 at 173
[neq, tspan, ntspan, next, t0, tfinal, tdir, y0, f0, odeArgs, ...
3Â¥2016-02-12 20:25:34
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