René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"secondary axis fails to respect major tick locator","articleBody":"\u003c!--To help us understand and resolve your issue, please fill out the form to the best of your ability.--\u003e\r\n\u003c!--You can feel free to delete the sections that do not apply.--\u003e\r\n\r\n### Bug report\r\n\r\n**Y tick locations on secondary y-axis are ignored**\r\n\r\nI 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].\r\n\r\n**Code for reproduction**\r\n\r\n\u003c!--A minimum code snippet required to reproduce the bug.\r\nPlease make sure to minimize the number of dependencies required, and provide\r\nany necessary plotted data.\r\nAvoid using threads, as Matplotlib is (explicitly) not thread-safe.--\u003e\r\n\r\n```python\r\n\r\nimport numpy as np\r\nimport matplotlib.pyplot as plt\r\n\r\nfig, ax = plt.subplots()\r\n\r\nx = np.arange(1, 100)\r\ny = np.sqrt(x)\r\nax.plot(x, y)\r\nax.set_xlim(0, 100)\r\nax.set_ylim(1, 10)\r\nsecax = ax.secondary_yaxis('right', functions=(lambda z: 10*np.log10(z), lambda z: np.power(10.0, z/10.0)))\r\n# Secondary y-axis tick locations get ignored.\r\nsecax.set_yticks([1, 2, 5, 10])\r\nplt.show()\r\nplt.close()\r\n```\r\n\r\n**Actual outcome**\r\n\r\n\u003c!--The output produced by the above code, which may be a screenshot, console output, etc.--\u003e\r\n\r\n![ytick_bug](https://user-images.githubusercontent.com/4089144/73840988-9fed8500-486d-11ea-97b3-aadc0e0d0e96.png)\r\n\r\n**Expected outcome**\r\n\r\n\u003c!--A description of the expected outcome from the code snippet--\u003e\r\n\u003c!--If this used to work in an earlier version of Matplotlib, please note the version it used to work on--\u003e\r\n\r\nI 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.\r\n\r\n**Matplotlib version**\r\n\u003c!--Please specify your platform and versions of the relevant libraries you are using:--\u003e\r\n  * Operating system: Windows 10 Build 10.0.18363\r\n  * Matplotlib version: 3.1.3\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): Qt5Agg\r\n  * Python version: Python 3.7.4 (default, Aug  9 2019, 18:34:13) [MSC v.1915 64 bit (AMD64)] :: Anaconda, Inc. on win32\r\n  * Jupyter version (if applicable):  N/A\r\n  * Other libraries: \r\n```\r\n# packages in environment at C:\\Miniconda3:\r\n#\r\n# Name                    Version                   Build  Channel\r\nasn1crypto                1.3.0                    py37_0\r\nastroid                   2.3.3                    py37_0\r\nblas                      1.0                         mkl\r\nca-certificates           2020.1.1                      0\r\ncertifi                   2019.11.28               py37_0\r\ncffi                      1.13.2           py37h7a1dbc1_0\r\nchardet                   3.0.4                 py37_1003\r\ncolorama                  0.4.3                      py_0\r\nconda                     4.8.2                    py37_0\r\nconda-package-handling    1.6.0            py37h62dcd97_0\r\nconsole_shortcut          0.1.1                         3\r\ncryptography              2.8              py37h7a1dbc1_0\r\ncycler                    0.10.0                   py37_0\r\nfreetype                  2.9.1                ha9979f8_1\r\nicc_rt                    2019.0.0             h0cc432a_1\r\nicu                       58.2                 ha66f8fd_1\r\nidna                      2.8                      py37_0\r\nintel-openmp              2019.4                      245\r\nisort                     4.3.21                   py37_0\r\njpeg                      9b                   hb83a4c4_2\r\nkiwisolver                1.1.0            py37ha925a31_0\r\nlazy-object-proxy         1.4.3            py37he774522_0\r\nlibpng                    1.6.37               h2a8f88b_0\r\nmatplotlib                3.1.3                    py37_0\r\nmatplotlib-base           3.1.3            py37h64f37c6_0\r\nmccabe                    0.6.1                    py37_1\r\nmenuinst                  1.4.16           py37he774522_0\r\nmkl                       2019.4                      245\r\nmkl-service               2.3.0            py37hb782905_0\r\nmkl_fft                   1.0.15           py37h14836fe_0\r\nmkl_random                1.1.0            py37h675688f_0\r\nnumpy                     1.18.1           py37h93ca92e_0\r\nnumpy-base                1.18.1           py37hc3f5095_1\r\nopenssl                   1.1.1d               he774522_3\r\npandas                    0.25.3           py37ha925a31_0\r\npatsy                     0.5.1                    py37_0\r\npip                       20.0.2                   py37_1\r\npowershell_shortcut       0.0.1                         2\r\npycosat                   0.6.3            py37he774522_0\r\npycparser                 2.19                     py37_0\r\npylint                    2.4.4                    py37_0\r\npyopenssl                 19.1.0                   py37_0\r\npyparsing                 2.4.6                      py_0\r\npyqt                      5.9.2            py37h6538335_2\r\npysocks                   1.7.1                    py37_0\r\npython                    3.7.4                h5263a28_0\r\npython-dateutil           2.8.1                      py_0\r\npytz                      2019.3                     py_0\r\npywin32                   227              py37he774522_1\r\nqt                        5.9.7            vc14h73c81de_0\r\nrequests                  2.22.0                   py37_1\r\nruamel_yaml               0.15.87          py37he774522_0\r\nscipy                     1.3.2            py37h29ff71c_0\r\nseaborn                   0.9.0              pyh91ea838_1\r\nsetuptools                45.1.0                   py37_0\r\nsip                       4.19.8           py37h6538335_0\r\nsix                       1.14.0                   py37_0\r\nsqlite                    3.31.1               he774522_0\r\nstatsmodels               0.11.0           py37he774522_0\r\ntornado                   6.0.3            py37he774522_0\r\ntqdm                      4.42.0                     py_0\r\nurllib3                   1.25.8                   py37_0\r\nvc                        14.1                 h0510ff6_4\r\nvs2015_runtime            14.16.27012          hf0eaf9b_1\r\nwheel                     0.34.2                   py37_0\r\nwin_inet_pton             1.1.0                    py37_0\r\nwincertstore              0.2                      py37_0\r\nwrapt                     1.11.2           py37he774522_0\r\nxlrd                      1.2.0                    py37_0\r\nyaml                      0.1.7                hc54c509_2\r\nzlib                      1.2.11               h62dcd97_3\r\n```\r\n\r\n\u003c!--Please tell us how you installed matplotlib and python e.g., from source, pip, conda--\u003e\r\n\u003c!--If you installed from conda, please specify which channel you used if not the default--\u003e\r\n\r\nInstalled via Miniconda distro, standard channels for packages.","author":{"url":"https://github.com/amedlin","@type":"Person","name":"amedlin"},"datePublished":"2020-02-05T12:23:21.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/16416/matplotlib/issues/16416"}