Fix Userwarning

[HengchengZhang]

Hi @jstac, this PR fixes #208.

[github-actions]

🚀 Deployed on https://649917f115317c7ae7be2643--nostalgic-wright-5fa355.netlify.app

[jstac]

Nice work @HengchengZhang .

I feel like there will be other instances of this throughout the lectures. I'll merge this but would you mind to do a quick search of the other lecture series and see?

[HengchengZhang]

Hi @jstac, this warning is because the use of the - symbol in k- has dulplicate settings with linestyle or ls.

I did a quick search in all quantecon codes in public repos and find this could originated from the same code here: https://github.com/QuantEcon/ShenzhenWinterCamp/blob/5eaea4e1e4bf9e23c6c968d07545c740131a4b14/John/scalar_dynamics.ipynb#L71

The good news is that our lectures are fine once #249 is merged and there is no warning message related to this issue anymore.

On the other hand we have this issue in three notebook repos which I don't have the access to modify.

• https://github.com/QuantEcon/quantecon-notebooks-python/blob/da913eb8a7b10a135457588722c9cfda8b5957b6/scalar_dynam.ipynb#L320
• https://github.com/QuantEcon/lecture-python.notebooks/blob/92deefa486178f68d698a8b0ea0b94b899661f90/scalar_dynam.ipynb#L319
• https://github.com/QuantEcon/ShenzhenWinterCamp/blob/5eaea4e1e4bf9e23c6c968d07545c740131a4b14/John/scalar_dynamics.ipynb#L71

The modification should be

ax.plot((x, x), (0, x), 'k-', ls='dotted')

to

ax.plot((x, x), (0, x), 'k', ls='dotted')

[jstac]

Good work @HengchengZhang . Let's leave it as is for now.