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Question: Tracing a phaseportrait

Question:Tracing a phaseportrait

aqualover001 8 Maple
plot student
May 19 2009
0
Hello, I am trying to trace a phaseportrait of this system: sys:=D(x)(t)=-a*x(t)+b*y(t), D(y)(t)=-c*(p1*x(t)+q1*(x(t))^3)+V0*d*cos(2*Pi*10^(-4)*f*t); where a:=0.1785714286, b:=1, c:=20000, d:=10, V0 varies and f:=1273. For instance, lets take V0=4.08. I did the following procedure: >with(DEtools): with(plots): >p1:=0.18*10^(-5): q1:=0.12*10^(-5): >sys:=D(x)(t)=-a*x(t)+b*y(t), D(y)(t)=-c*(p1*x(t)+q1*(x(t))^3)+V0*d*cos(2*Pi*10^(-4)*f*t); >ic:=[[x(0)=-0.09,y(0)=-0.09],[x(0)=-0.09,y(0)=0.09],[x(0)=0.09,y(0)=-0.09],[x(0)=0.09,y(0)=0.09]]; >DEplot([eval(sys,a=0.2)],[x(t),y(t)],t=-10..10,ic,linecolor=blue,stepsize=0.1,arrows=SMALL); I get a plot but the thing is that it is only the trajectory and i want the arrows with it.... I don't know if it's because of my initial conditions... Or if it's just because we can't have arrows.... Can somebody please help me!!! Thanks in advance!
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