# How use Systems.henonheiles from InteractiveDynamics

**URL:** https://discourse.julialang.org/t/how-use-systems-henonheiles-from-interactivedynamics/62042
**Category:** General Usage
**Tags:** package, diffeq
**Created:** [May 29, 2021, 3:23pm UTC](https://discourse.julialang.org/t/how-use-systems-henonheiles-from-interactivedynamics/62042 "2021-05-29T15:23:49Z")
**Posts on this page:** 1
**Page:** 1

<div class="post-metadata">

### Author: ![murrayE](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/murraye/32/24428_2.png) [@murrayE](https://discourse.julialang.org/u/murrayE)
#### Post date: [May 29, 2021, 3:23pm UTC](https://discourse.julialang.org/t/how-use-systems-henonheiles-from-interactivedynamics/62042/1 "2021-05-29T15:23:49Z")

</div>

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/](https://juliadynamics.github.io/InteractiveDynamics.jl/dev/trajectory/)).

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

In that environment, I executed:

```julia
using InteractiveDynamics
using DynamicalSystems, GLMakie
using OrdinaryDiffEq

```

But when I try to execute next…

```julia
ds = Systems.henonheiles()

```

… I get error:

```julia
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.