logitlocator misses tick at edge of axis

Bug report

Bug summary

When no data is plotted, a logit scale ignores calls to set_{x/y}lim and sticks to the default(?) of [1e-7, 1-1e-7]

edit: fixed, but see follow up at #14743 (comment).

Code for reproduction

gca().set(yscale="logit", ylim=(.9, .999))  # or (.001, .1), or etc.

Actual outcome

This image is made with the formatter provided by #14512 for legibility (the formatter before that PR is impossible to read), but that doesn't change the axes limits.

Expected outcome

limits respecting the set ylims.
Note that adding a call to e.g. plot(<any values>) (within or without the given limits) fixes the issue.

Matplotlib version

Operating system: linux
Matplotlib version: 3.1 or master, perhaps earlier?
Matplotlib backend (print(matplotlib.get_backend())): any
Python version: 3.7
Jupyter version (if applicable):
Other libraries:

LogitLocator: allows nonsingular works with no plotted values

TestLogitLocator: append a test on nonsingular to avoid issues as mat…

LogitLocator: allows nonsingular works with no plotted values

TestLogitLocator: append a test on nonsingular to avoid issues as mat…

This issue seems to be more complicated. When I try to explicitly set the axis limits, axis limits revert to the default (i.e. the opposite of what I want). This is independent of whether I run a plot command afterward. Also the default range is too large and default number of ticks is too high.

import matplotlib.pyplot as plt
import numpy as np
f, ax = plt.subplots()
N = 50
ax.set_yscale('logit')
# ax.set_ylim((0.1,0.9))
ax.plot(np.linspace(0,1,N), np.linspace(0.1,0.9,N))

import matplotlib.pyplot as plt
import numpy as np
f, ax = plt.subplots()
N = 50
ax.set_yscale('logit')
ax.set_ylim((0.1,0.9))
ax.plot(np.linspace(0,1,N), np.linspace(0.1,0.9,N))

As of master, the results are

So at least the number of ticks issue is solved (cf. #14512).

The original issue was fixed in #14928, but there's a small followup: when doing gca().set(yscale="logit", ylim=(.9, .999)), there is no tick at x=0.999, but it shows up if the upper limit is 0.999001 for example. Probably just a matter of < vs <=...

Is anyone else currently working on this? If not I'll give it a try.

Go for it.

The remaining example gca().set(yscale="logit", ylim=(.9, .999)) now gives:

which seems different from the description, but hardly correct.

I think that's what I said: a tick is missing at the top (1-1e-3).

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logitlocator misses tick at edge of axis #14743

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logitlocator misses tick at edge of axis #14743

Description

Bug report

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lukelbd commented on Aug 8, 2019

timhoffm commented on Aug 10, 2019

anntzer commented on Sep 10, 2019

RiazCharania commented on Mar 2, 2020

timhoffm commented on Mar 4, 2020

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oscargus commented on Jun 4, 2022

anntzer commented on Jul 15, 2022

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