How use Systems.henonheiles from InteractiveDynamics

Question

I’m trying to duplicate the first example of trajectory evolution in the docs for the InteractiveDynamcis package (https://juliadynamics.github.io/InteractiveDynamics.jl/dev/trajectory/).

I’ve already created an environment into which I’ve added InteractiveDynamics, DynamicalSystems, GLMakie, and OrdinaryDiffEq.

In that environment, I executed:

using InteractiveDynamics
using DynamicalSystems, GLMakie
using OrdinaryDiffEq

But when I try to execute next…

ds = Systems.henonheiles()

… I get error:

ERROR: UndefVarError: Systems not defined
Stacktrace:
 [1] top-level scope

What is Systems?

I tried to add a package named Systems but no such package was found.

Answer 1

Can you share what package versions you are using? On Julia 1.6.1 with the following package versions, the code above works:

  [61744808] DynamicalSystems v1.7.7
  [ec714cd0] InteractiveDynamics v0.15.1
  [e9467ef8] GLMakie v0.3.4
  [1dea7af3] OrdinaryDiffEq v5.57.0

Answer 2

Surely: ds = DynamicalSystems.henonheiles()

unless you do Systems = DynamicalSystems first