Runge–Kutta Playground

Top notes area — author explanations.
Side notes — method comparison, stability, step size guidance.
Click in the canvas to set the initial state (x,y). Blue = RK4, Red = Euler (comparison).

Systems: SHO (x' = y, y' = −x). Van der Pol (x' = y, y' = μ(1−x²)y − x). Lotka–Volterra (prey–predator) uses preset parameters.

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Side notes — phase portraits, limit cycles, stiffness.
Bottom notes — add summary or references.