Van der Pol Radau5 example plotting fails

[JEMH]

When I tried to run the Van der Pol Radau5 example, the plot was not produced.

In the generated python script I see the line: plt.title(""" Van der Pol ($\varepsilon = 10^{-6}$) - Radau5 - Tol = 1e-4 """)

I changed this to: plt.title(""" Van der Pol ($\epsilon = 10^{-6}$) - Radau5 - Tol = 1e-4 """)

and ran the python script directly. This produced the desired graphic.

[JEMH]

I see that the problem lies in the file van_der_pol_radau5.rs. The line: plot.set_subplot(2, 1, 1) .set_title("Van der Pol ($\varepsilon = 10^{-6}$) - Radau5 - Tol = 1e-4")

should be replaced by:

plot.set_subplot(2, 1, 1)
    .set_title(r"Van der Pol ($\\epsilon = 10^{-6}$) - Radau5 - Tol = 1e-4")

[cpmech]

Hi,

Thank you for reporting this issue.

I suppose you've used the more recent Plotpy version (1.0.0) in the example. The version originally was 0.6.0.

The newer Plotpy version (1.0.0) has a different way of handling raw strings but did not handle well the case of \varepsilon from TeX (I like varepsilon instead of epsilon 😊). Python/Matplotlib has difficulty in handling \v.

Thus, to fix this problem once and for all, I've improved Plotpy (https://github.com/cpmech/plotpy/pull/48). Please use the Plotpy version "1.1.0" or newer in your examples.

Also, please note that this problem only arises with the optional plotting code used in the example.

Thanks again.

[JEMH]

Hello,

Using Plotpy 1.1.0 the example runs as desired. Thank you for the explanation.