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Question: DEtools/DEplot/CheckDE) derivatives must be given explicitly

Question:DEtools/DEplot/CheckDE) derivatives must be given explicitly

ComputerUser 535
September 12 2017
0

subs can not make diff(1, t) = 0

sys := simplify(subs(diff(1,t)=0,subs(c(t)=1,[ode1a,ode3a])));
sys := [diff(a(t), t) = 1.342398800*10^5*a(t)+89591*b(t)+44647, 44647*a(t)+44902*b(t)+44859];

DEplot(sys, [a(t), b(t)], t = 0 .. 16, a = -16 .. 16, b = -16 .. 16, color = magnitude, title = `Stable Limit Cycles`, arrows = curve, dirfield = 800, axes = none);
Error, (in DEtools/DEplot/CheckDE) derivatives must be given explicitly

why can not plot?


 
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