code: def rk4_step(force, state, time, dt):
      """Compute one step of the rk4 approximation.
  
      Parameters
      ----------
      force : callable
          Vector field that is being integrated.
      state : array-like, shape=[2, dim]
          State at time t, corresponds to position and velocity variables at
          time t.
      time : float
          Time variable.
      dt : float
          Time-step in the integration.
  
      Returns
      -------
      point_new : array-like, shape=[..., {dim, [n, n]}]
          First variable at time t + dt.
      vector_new : array-like, shape=[..., {dim, [n, n]}]
          Second variable at time t + dt.
  
      See Also
      --------
      https://en.wikipedia.org/wiki/Runge–Kutta_methods
      """
      k1 = force(state, time)
      k2 = force(state + dt / 2 * k1, time + dt / 2)
      k3 = force(state + dt / 2 * k2, time + dt / 2)
      k4 = force(state + dt * k3, time + dt)
      new_state = state + dt / 6 * (k1 + 2 * k2 + 2 * k3 + k4)
      return new_state
  
imports: from geomstats.errors import check_parameter_accepted_values
label_desc: Use image node_id 5 for calling a global function with example usage: rk4_step(force, state, time, dt) and returns: new_state