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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Incorrect placement of Colorbar ticks using LogNorm","articleBody":"### Bug report\r\n\r\n**Bug summary**\r\n\r\nAfter upgrading to Matplotlib v3.0.0, the tick marks on the colorbar are no longer placed correctly when using a matplotlib.colors.LogNorm normalization. \r\n\r\n**Code for reproduction**\r\n\r\nThe code is embedded in a class defined within the NeXpy application, but uses standard Matplotlib function calls. Here are the relevant extracted lines:\r\n\r\n```python\r\nfrom matplotlib.colors import LogNorm, Normalize, SymLogNorm\r\nfrom matplotlib.ticker import AutoLocator, LogLocator, ScalarFormatter\r\nfrom matplotlib.ticker import LogFormatterSciNotation as LogFormatter\r\n        self.norm = LogNorm(self.vaxis.lo, self.vaxis.hi)\r\n        self.locator = LogLocator()\r\n        self.formatter = LogFormatter()\r\n        self.image = ax.pcolormesh(x, y, self.v, cmap=self.cmap, **opts)\r\n        self.image.set_norm(self.norm)\r\n        self.colorbar = self.figure.colorbar(self.image, ax=ax, norm=self.norm)\r\n        self.colorbar.locator = self.locator\r\n        self.colorbar.formatter = self.formatter\r\n        self.colorbar.update_normal(self.image)\r\n```\r\n\r\n**Actual outcome**\r\n\r\nIn Matplotlib v3.0.0, I get:\r\n![matplotlib_3_0_0](https://user-images.githubusercontent.com/1193959/45703125-0cf96100-bb39-11e8-81e8-70de6cb87b3e.png)\r\n\r\n**Expected outcome**\r\n\r\nIn Matplotlib v2.2.3, I get:\r\n![matplotlib_2_2_3](https://user-images.githubusercontent.com/1193959/45703101-fe12ae80-bb38-11e8-9462-8abe64722570.png)\r\n\r\n\r\n**Matplotlib version**\r\n  * Operating system: Mac OS 10.12.6\r\n  * Matplotlib version: 3.0.0\r\n  * Matplotlib backend: Qt5Agg\r\n  * Python version: 3.6.5\r\n\r\nI got the same result when using conda to install v3.0.0 or pip to install the latest development version.","author":{"url":"https://github.com/rayosborn","@type":"Person","name":"rayosborn"},"datePublished":"2018-09-18T17:00:20.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":16},"url":"https://github.com/12155/matplotlib/issues/12155"}