2D Phase Portrait & Nullclines
Vector fields, nullclines, and trajectories — click to launch orbits
System
Van der Pol
Lotka-Volterra
Duffing
Pendulum
Hopf
Parameters
μ / param 1:
1.0
α / param 2:
1.0
View range:
4
Show nullclines:
Show field:
Clear Trajectories
dx/dt = μ(x−x³/3−y)
dy/dt = x/μ
Click the canvas to start a trajectory. Green = x-nullclines (dx/dt=0), Blue = y-nullclines (dy/dt=0). Fixed points at intersections.