[Bug]: Tick class instantiation returns an error when labelcolor is a tuple #26588

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1. rcomer commented on Aug 24, 2023

   

   rcomer

   on Aug 24, 2023

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   Thank you for the report @jpdehollain. Could you provide a minimal code example that reproduces the problem? Also, did this work with previous Matplotlib versions?
2. rcomer

   added

   status: needs clarificationIssues that need more information to resolve.Issues that need more information to resolve.

   on Aug 24, 2023
3. anntzer commented on Aug 24, 2023

   

   anntzer

   on Aug 24, 2023

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   Seems like we should just use cbook._str_equal here.
4. jpdehollain commented on Aug 24, 2023

   

   jpdehollain

   on Aug 24, 2023

   Last edited by rcomer

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   Thank you for the report @jpdehollain. Could you provide a minimal code example that reproduces the problem? Also, did this work with previous Matplotlib versions?

   Thanks for looking into it @rcomer... here's a minimal example:

   import matplotlib.pyplot as plt
   import numpy as np
   
   fig, ax = plt.subplots(figsize=(12,8))
   twin1 = ax.twinx()
   colors = np.concatenate(([[0, 0, 0, 1]], plt.cm.tab10([3, 0])))
   x = np.linspace(0,1,100)
   y = x**2
   z = x**3
   
   ax.plot(x, y, color=colors[0])
   twin1.plot(x,z, color=colors[1])
   tkw = dict(size=4, width=1.5)
   ax.tick_params(axis="y", colors=ax.lines[0].get_color(), **tkw)
   twin1.tick_params(axis="y", colors=twin1.lines[0].get_color(), **tkw)
   ax.tick_params(axis="x", **tkw)
   

   I run it as a code cell in an interactive python session... The odd thing is that if I first just run up to the two plot commands, it displays the plot and then if I run the rest it'll modify the tick label colours with no errors. I only get the error when I run the whole code block in one go. Here's the full error trace:

   Traceback (most recent call last):
     File ".\matplotlib\backends\backend_qt.py", line 468, in _draw_idle
       self.draw()
     File ".\matplotlib\backends\backend_agg.py", line 400, in draw
       self.figure.draw(self.renderer)
     File ".\matplotlib\artist.py", line 95, in draw_wrapper
       result = draw(artist, renderer, *args, **kwargs)
     File ".\matplotlib\artist.py", line 72, in draw_wrapper
       return draw(artist, renderer)
     File ".\matplotlib\figure.py", line 3175, in draw
       mimage._draw_list_compositing_images(
     File ".\matplotlib\image.py", line 131, in _draw_list_compositing_images
       a.draw(renderer)
     File ".\matplotlib\artist.py", line 72, in draw_wrapper
       return draw(artist, renderer)
     File ".\matplotlib\axes\_base.py", line 3064, in draw
       mimage._draw_list_compositing_images(
     File ".\matplotlib\image.py", line 131, in _draw_list_compositing_images
       a.draw(renderer)
     File ".\matplotlib\artist.py", line 72, in draw_wrapper
       return draw(artist, renderer)
     File ".\matplotlib\axis.py", line 1376, in draw
       ticks_to_draw = self._update_ticks()
     File ".\matplotlib\axis.py", line 1264, in _update_ticks
       major_ticks = self.get_major_ticks(len(major_locs))
     File ".\matplotlib\axis.py", line 1602, in get_major_ticks
       tick = self._get_tick(major=True)
     File ".\matplotlib\axis.py", line 1551, in _get_tick
       return self._tick_class(self.axes, 0, major=major, **tick_kw)
     File ".\matplotlib\axis.py", line 478, in __init__
       super().__init__(*args, **kwargs)
     File ".\matplotlib\axis.py", line 125, in __init__
       if labelcolor == 'inherit':
   ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()
   

   👍React with 👍1Reacted by Ruth Comer
5. rcomer

   added

   status: confirmed bug

   and removed

   status: needs clarificationIssues that need more information to resolve.Issues that need more information to resolve.

   on Aug 24, 2023
6. rcomer commented on Aug 25, 2023

   

   rcomer

   on Aug 25, 2023

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   The odd thing is that if I first just run up to the two plot commands, it displays the plot and then if I run the rest it'll modify the tick label colours with no errors. I only get the error when I run the whole code block in one go.

   I think the ticks are instantiated when the figure is first drawn. So if you only display right at the end then the ticks are instantiated with the options you put in tick_params. If you display before you change the colours then the ticks get instantiated with default values and then the colour change is applies via Tick._apply_params. The bug is only in the instantiation method.
7. QuLogic

   added this to the v3.7.3 milestone on Aug 25, 2023
8. ksunden

   closed this as completedin #26598on Aug 28, 2023