Issue in analyze_scalar_field.py

[GenB31415]

Dear authors,
while execution of the example 'analyze_scalar_field.py' I met that from 4 subplots only [0,0] shows the expected information, but other 3 are empty. The following traceback info emerges
[for short: path ---> ...\AppData\Local\Programs\Python\Python39\lib\site-packages]]

Traceback (most recent call last):
File "...\analyze_scalar_field.py", line 26, in
smoothed.plot(ax=axes[1, 0], title="Smoothed field")
File "path\pde\tools\plotting.py", line 287, in wrapper
reference = wrapped(*args, ax=ax, **kwargs)
File "path\pde\fields\base.py", line 1907, in plot
reference = self._plot_image(**kwargs)
File "path\pde\fields\base.py", line 1727, in _plot_image
add_scaled_colorbar(axes_image, ax=ax)
File "path\pde\tools\plotting.py", line 95, in add_scaled_colorbar
cax = divider.append_axes("right", size=width, pad=pad)
File "path\mpl_toolkits\axes_grid1\axes_divider.py", line 551, in append_axes
self._fig.add_axes(ax)
File "path\matplotlib\figure.py", line 653, in add_axes
return self._add_axes_internal(a, key)
File "path\matplotlib\figure.py", line 789, in _add_axes_internal
self.sca(ax)
File "path\matplotlib\figure.py", line 1496, in sca
self.axobservers.process("axes_change_event", self)
File "path\matplotlib\cbook_init.py", line 275, in process
self.exception_handler(exc)
File "path\matplotlib\cbook_init.py", line 89, in exception_printer
raise exc
File "path\matplotlib\cbook_init.py", line 270, in process
func(*args, **kwargs)
File "path\matplotlib\figure.py", line 2861, in
self._axobservers.connect("axes_change_event", lambda arg: func(arg))
File "path\matplotlib\backend_bases.py", line 2765, in notify_axes_change
self.toolbar.update()
File "path\matplotlib\backend_bases.py", line 3330, in update
self.set_history_buttons()
File "path\matplotlib\backends_backend_tk.py", line 666, in set_history_buttons
self.buttons['Back']['state'] = state_map[can_back]
File "...\AppData\Local\Programs\Python\Python39\lib\tkinter_init.py", line 1657, in setitem
self.configure({key: value})
File "...\AppData\Local\Programs\Python\Python39\lib\tkinter_init.py", line 1646, in configure
return self.configure('configure', cnf, kw)
File "...\AppData\Local\Programs\Python\Python39\lib\tkinter_init.py", line 1636, in _configure
self.tk.call(_flatten((self._w, cmd)) + self._options(cnf))
_tkinter.TclError: invalid command name ".!navigationtoolbar2tk.!button2"

How to overcome this issue ? Thank you in advance.

[david-zwicker]

I can recreate the bug that only the first panel is used when calling a python script (albeit this does not happen when running this code in a jupyter notebook). I do not see the exception you've seen, but this might have to do with the chosen backend. I opened an Issue to fix the original problem, which might also remove the exception.

[david-zwicker]

I just updated the main branch with a larger pack of changes, including a patch that should fix the issue in the example. Could you please test whether things work now?

[GenB31415]

Do I have to reinstall the py-pde in my PC to test the changes? Thanks.

[david-zwicker]

You should be able to update to the latest version via git/pip/conda, depending on how you installed the package.

[GenB31415]

I did pip install py-pde (I don't use conda). After that the file 'analyze_scalar_field.py' produces expected output without any exceptions. Thank you!
[By the way, do you plan to create something like frequently asked questions (faq)? It will be useful for all the community of your great package. ]

[david-zwicker]

I'm not sure whether a FAQ would actually be that helpful. I'd rather use the GitHub discussions here to collect answers, similar to how stackoverflow.