Closed
Description
Bug report
Y tick locations on secondary y-axis are ignored
I create a secondary y-axis on a plot and set custom y tick locations. But my specified tick locations get ignored. In this example the right hand y-axis should have ticks at positions [1, 2, 5, 10].
Code for reproduction
import numpy as np
import matplotlib.pyplot as plt
fig, ax = plt.subplots()
x = np.arange(1, 100)
y = np.sqrt(x)
ax.plot(x, y)
ax.set_xlim(0, 100)
ax.set_ylim(1, 10)
secax = ax.secondary_yaxis('right', functions=(lambda z: 10*np.log10(z), lambda z: np.power(10.0, z/10.0)))
# Secondary y-axis tick locations get ignored.
secax.set_yticks([1, 2, 5, 10])
plt.show()
plt.close()Actual outcome
Expected outcome
I expect the right hand y-axis to be labeled with ticks at positions [1, 2, 5, 10], not [0, 2, 4, 6, 8, 10]. If I try to force this by using matplotlib.tickerFixedLocator, I still see the same problem.
Matplotlib version
- Operating system: Windows 10 Build 10.0.18363
- Matplotlib version: 3.1.3
- Matplotlib backend (
print(matplotlib.get_backend())): Qt5Agg - Python version: Python 3.7.4 (default, Aug 9 2019, 18:34:13) [MSC v.1915 64 bit (AMD64)] :: Anaconda, Inc. on win32
- Jupyter version (if applicable): N/A
- Other libraries:
# packages in environment at C:\Miniconda3:
#
# Name Version Build Channel
asn1crypto 1.3.0 py37_0
astroid 2.3.3 py37_0
blas 1.0 mkl
ca-certificates 2020.1.1 0
certifi 2019.11.28 py37_0
cffi 1.13.2 py37h7a1dbc1_0
chardet 3.0.4 py37_1003
colorama 0.4.3 py_0
conda 4.8.2 py37_0
conda-package-handling 1.6.0 py37h62dcd97_0
console_shortcut 0.1.1 3
cryptography 2.8 py37h7a1dbc1_0
cycler 0.10.0 py37_0
freetype 2.9.1 ha9979f8_1
icc_rt 2019.0.0 h0cc432a_1
icu 58.2 ha66f8fd_1
idna 2.8 py37_0
intel-openmp 2019.4 245
isort 4.3.21 py37_0
jpeg 9b hb83a4c4_2
kiwisolver 1.1.0 py37ha925a31_0
lazy-object-proxy 1.4.3 py37he774522_0
libpng 1.6.37 h2a8f88b_0
matplotlib 3.1.3 py37_0
matplotlib-base 3.1.3 py37h64f37c6_0
mccabe 0.6.1 py37_1
menuinst 1.4.16 py37he774522_0
mkl 2019.4 245
mkl-service 2.3.0 py37hb782905_0
mkl_fft 1.0.15 py37h14836fe_0
mkl_random 1.1.0 py37h675688f_0
numpy 1.18.1 py37h93ca92e_0
numpy-base 1.18.1 py37hc3f5095_1
openssl 1.1.1d he774522_3
pandas 0.25.3 py37ha925a31_0
patsy 0.5.1 py37_0
pip 20.0.2 py37_1
powershell_shortcut 0.0.1 2
pycosat 0.6.3 py37he774522_0
pycparser 2.19 py37_0
pylint 2.4.4 py37_0
pyopenssl 19.1.0 py37_0
pyparsing 2.4.6 py_0
pyqt 5.9.2 py37h6538335_2
pysocks 1.7.1 py37_0
python 3.7.4 h5263a28_0
python-dateutil 2.8.1 py_0
pytz 2019.3 py_0
pywin32 227 py37he774522_1
qt 5.9.7 vc14h73c81de_0
requests 2.22.0 py37_1
ruamel_yaml 0.15.87 py37he774522_0
scipy 1.3.2 py37h29ff71c_0
seaborn 0.9.0 pyh91ea838_1
setuptools 45.1.0 py37_0
sip 4.19.8 py37h6538335_0
six 1.14.0 py37_0
sqlite 3.31.1 he774522_0
statsmodels 0.11.0 py37he774522_0
tornado 6.0.3 py37he774522_0
tqdm 4.42.0 py_0
urllib3 1.25.8 py37_0
vc 14.1 h0510ff6_4
vs2015_runtime 14.16.27012 hf0eaf9b_1
wheel 0.34.2 py37_0
win_inet_pton 1.1.0 py37_0
wincertstore 0.2 py37_0
wrapt 1.11.2 py37he774522_0
xlrd 1.2.0 py37_0
yaml 0.1.7 hc54c509_2
zlib 1.2.11 h62dcd97_3
Installed via Miniconda distro, standard channels for packages.