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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"ax.bar throws when x axis is pandas datetime","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**Bug summary**\r\n\r\nax.bar throws error when x-axis is datetime, behaviour has changed between current master (throws error) and version 3.0.2 (no error)\r\n\r\n**Code for reproduction**\r\n\r\n```python\r\nimport pandas as pd\r\nimport matplotlib.pyplot as plt\r\n\r\nfig = plt.figure(figsize=(20,10));\r\nax = fig.gca();\r\n\r\ndf = pd.DataFrame({'year':[2018,2018,2018],'month':[1,1,1], 'day':[1,2,3], 'value':[1,2,3]})\r\ndf['date'] = pd.to_datetime(df[['year', 'month', 'day']])\r\n\r\nax.bar(df['date'], df['value'], width=10,align='center')\r\n```\r\n\r\n**Actual outcome**\r\n\r\n```\r\n---------------------------------------------------------------------------\r\nValueError                                Traceback (most recent call last)\r\n\u003cipython-input-12-500999fd6ea9\u003e in \u003cmodule\u003e\r\n      8 df['date'] = pd.to_datetime(df[['year', 'month', 'day']])\r\n      9 \r\n---\u003e 10 ax.bar(df['date'], df['value'], width=10,align='center')\r\n\r\n~/matplotlib/lib/matplotlib/__init__.py in inner(ax, data, *args, **kwargs)\r\n   1515     def inner(ax, *args, data=None, **kwargs):\r\n   1516         if data is None:\r\n-\u003e 1517             return func(ax, *map(sanitize_sequence, args), **kwargs)\r\n   1518 \r\n   1519         bound = new_sig.bind(ax, *args, **kwargs)\r\n\r\n~/matplotlib/lib/matplotlib/axes/_axes.py in bar(self, x, height, width, bottom, align, **kwargs)\r\n   2230             x0 = x\r\n   2231             x = np.asarray(self.convert_xunits(x))\r\n-\u003e 2232             width = self._convert_dx(width, x0, x, self.convert_xunits)\r\n   2233             if xerr is not None:\r\n   2234                 xerr = self._convert_dx(xerr, x0, x, self.convert_xunits)\r\n\r\n~/matplotlib/lib/matplotlib/axes/_axes.py in _convert_dx(dx, x0, xconv, convert)\r\n   2055                 dx = [dx]\r\n   2056                 delist = True\r\n-\u003e 2057             dx = [convert(x0 + ddx) - x for ddx in dx]\r\n   2058             if delist:\r\n   2059                 dx = dx[0]\r\n\r\n~/matplotlib/lib/matplotlib/axes/_axes.py in \u003clistcomp\u003e(.0)\r\n   2055                 dx = [dx]\r\n   2056                 delist = True\r\n-\u003e 2057             dx = [convert(x0 + ddx) - x for ddx in dx]\r\n   2058             if delist:\r\n   2059                 dx = dx[0]\r\n\r\npandas/_libs/tslibs/timestamps.pyx in pandas._libs.tslibs.timestamps._Timestamp.__add__()\r\n\r\nValueError: Cannot add integral value to Timestamp without freq.\r\n```\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\n**Matplotlib version**\r\nbuilt matplotlib from source\r\n","author":{"url":"https://github.com/david-waterworth","@type":"Person","name":"david-waterworth"},"datePublished":"2019-01-14T23:22:26.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":8},"url":"https://github.com/13186/matplotlib/issues/13186"}