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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"error in construction of inverted log transforms","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\nThe `__init__` method for scale.LogTransformBase takes a required positional argument `nonpos`, but it's derived classes are constructed without that required argument in the `inverted` method.\r\n\r\n\u003c!--A short 1-2 sentences that succinctly describes the bug--\u003e\r\n\r\n**Code for reproduction**\r\n\r\n\u003c!--A minimum code snippet required to reproduce the bug, also minimizing the number of dependencies required--\u003e\r\n\r\n```python\r\nimport matplotlib.scale as scale\r\ntform = scale.InvertedLog10Transform() #OK\r\ntform = tform.inverted() #not OK\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```\r\nTypeError: __init__() missing 1 required positional argument: 'nonpos'\r\n```\r\n\r\n**Expected outcome**\r\n\r\nproper construction of transform object.\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\n**Matplotlib version**\r\n\u003c!--Please specify your platform and versions of the relevant libraries you are using:--\u003e\r\n  * Operating system: ubuntu 16.04\r\n  * Matplotlib version: 2.0.0\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): Qt5Agg\r\n  * Python version: 3.6\r\n  * Jupyter version (if applicable):\r\n  * Other libraries: \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\n","author":{"url":"https://github.com/fkloosterman","@type":"Person","name":"fkloosterman"},"datePublished":"2018-01-09T16:49:42.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/10202/matplotlib/issues/10202"}