python - solving autonomous ODE -


i trying solve autonomous ode system using scipy ode. code has no syntax mistake cannot give correct answer. gives,

/users/daoyuan/library/enthought/canopy_64bit/user/lib/python2.7/site-packages/scipy/integrate/_ode.py:741:  userwarning: vode: illegal input detected. (see printed message.                                                 'unexpected istate=%s' % istate))

here code

from numpy import*  scipy.integrate import  ode  def autonomous_function(y,t):     y1=y[0]     y2=y[1]     dy1=y1**2*y2-4*y1+1     dy2=3*y1-y1**2*y2     return [y1,y2]  t0=0 y10=0 y20=0 t_final=1 dt=1/10  solver=ode(autonomous_function) solver.set_integrator('vode') solver.set_initial_value([y10,y20],t0)  y_result=[] t_output=[]  y_result.append([y10,y20]) t_output.append(t0)  while solver.successful() , solver.t<t_final:     solver.integrate(solver.t+dt)      y_result.append(solver.y)     t_output.append(t_output)  y_result=array(y_result) t_output=array(t_output)  y_result


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