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symlog + minor ticks = exception #6967

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LevN0 opened this issue Aug 23, 2016 · 5 comments
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symlog + minor ticks = exception #6967

LevN0 opened this issue Aug 23, 2016 · 5 comments
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status: confirmed bug
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v2.0.1

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@LevN0
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LevN0 commented Aug 23, 2016 •
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Present in 1.5.1 and on 2.0.0b3, as well as master I think.

Enabling minor ticks via minorticks_on and having scale set to symlog raises an exception. In minorticks_on, the input passed to SymmetricalLogLocator is base and subs, but SymmetricalLogLocator is expecting transform and subs. Calling self._transform.base, when self._transform is a base (a float) causes exception,

...
File "C:\Python27_numpy\lib\site-packages\matplotlib\axis.py", line 900, in iter_ticks
minorLocs = self.minor.locator()
File "C:\Python27_numpy\lib\site-packages\matplotlib\ticker.py", line 1662, in call
return self.tick_values(vmin, vmax)
File "C:\Python27_numpy\lib\site-packages\matplotlib\ticker.py", line 1665, in tick_values
b = self._transform.base
AttributeError: 'float' object has no attribute 'base'

Minimum code to reproduce,

import matplotlib.pyplot as plt

plt.plot([1,2,3,4])

ax = plt.gca()
ax.set_xscale('symlog')
ax.set_yscale('symlog')
ax.minorticks_on()

plt.show()
@tacaswell tacaswell added this to the 2.0.1 (next bug fix release) milestone Aug 23, 2016
@tacaswell
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This went in via a6716df from @Tillsten (but without a test). I am not sure this has ever actually worked.

@dncnwtts
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dncnwtts commented Sep 23, 2016 •
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It seems like the issue has something to do with the way the SymmetricalLogLocator was implemented in the first place. The current implementation seems to explicitly exclude all ticks within the linear regime.

A custom solution described here seems to mostly solve the issue, which could be absorbed into the repository.

This was referenced Mar 20, 2017
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@QuLogic QuLogic modified the milestones: 2.0.1 (next bug fix release), 2.0.2 (next bug fix release) May 3, 2017
@tacaswell
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closed by #8367

@QuLogic QuLogic modified the milestones: v2.0.1, 2.0.3 (next bug fix release) May 15, 2017
@zhangt58
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I've encountered this bug with 1.5.1 today, it's good to know the issue has been fixed in the newer release. While here is the trick to work around with version 1.5.1:

from matplotlib.ticker import AutoMinorLocator
from matplotlib.ticker import NullLocator
# turn minor ticks on
self.axes.xaxis.set_minor_locator(AutoMinorLocator())
self.axes.yaxis.set_minor_locator(AutoMinorLocator())
# turn minor ticks off
self.axes.xaxis.set_minor_locator(NullLocator())
self.axes.yaxis.set_minor_locator(NullLocator())

zhangt58 added a commit to phantasy-project/mpl4qt that referenced this issue Mar 14, 2019
@zhangt58
ENH: Update method to toggle minor ticks, symlog + mtick may crash.
6944c1b 
see: matplotlib/matplotlib#6967
@guido-granda
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Hi,
I'm using matplotlib 3.3.4 and it looks like this usse is not fixed.

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@tacaswell @QuLogic @zhangt58 @dncnwtts @guido-granda @LevN0