René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Wrong Error Message","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\nAffects: commit 7b5ff33   (master, 23 Aug 2018)\r\n\r\nAn attempt to plot a single point at coords (2,3) with RGB color (120,130,140) throws an error message remarking about argument shapes mismatching. Message should be about RGB values outside range 0 to 1.\r\n\r\n**Code for reproduction**\r\n\r\n```python\r\nax.scatter(np.array([2]), np.array([3]), c=np.array([[120,130,140]]))\r\n```\r\n```\r\nValueError: c of shape (1, 3) not acceptable as a color sequence for x with size 1, y with size 1\r\n```\r\n\r\nThis is ok:\r\n\r\n```python\r\nax.scatter(np.array([2]), np.array([3]), c=np.array([[120,130,140]]) / 255.0 )\r\n```\r\n\r\n**Actual outcome**\r\n\r\nSee above.\r\n\r\n**Expected outcome**\r\n\r\nSuggestion: error message could be about RGB values outside of 0 to 1 range.\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**Trace**\r\n\r\n```python\r\n  File \"/home/d/code/matplotlib/lib/matplotlib/axes/_axes.py\", line 4223, in scatter\r\n    .format(nc=n_elem, xs=x.size, ys=y.size)\r\nValueError: 'c' argument has 3 elements, which is not acceptable for use with 'x' with size 1, 'y' with size 1.\r\n\r\n```\r\n\r\npython 2 gives slightly different trace:\r\n```python\r\n/home/d/.conda/envs/py2_dp/lib/python2.7/site-packages/matplotlib-2.2.2-py2.7-linux-x86_64.egg/matplotlib/axes/_axes.pyc in scatter(self, x, y, s, c, marker, cmap, norm, vmin, vmax, alpha, linewidths, verts, edgecolors, **kwargs)\r\n   4277                 raise ValueError(\"c of shape {} not acceptable as a color \"\r\n   4278                                  \"sequence for x with size {}, y with size {}\"\r\n-\u003e 4279                                  .format(c.shape, x.size, y.size))\r\n   4280         else:\r\n   4281             colors = None  # use cmap, norm after collection is created\r\n\r\nValueError: c of shape (1, 3) not acceptable as a color sequence for x with size 1, y with size 1\r\n```\r\n\r\n**Matplotlib version**\r\n\r\n  * Operating system: Ubuntu 16.04\r\n  * Matplotlib version: commit 7b5ff33   (master, 23 Aug 2018)\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`):  \u003cobject object at 0x7f8885d87190\u003e\r\n  * Python version: 3.5.5\r\n  * Jupyter version (if applicable): none\r\n  * Other libraries: numpy\r\n\r\nHow I installed matplotlib:\r\n\r\n1. Create new conda env with python 3.5.5\r\n2. git clone matplotlib master\r\n3. pip install -e /path/to/cloned-repo\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/davidleejy","@type":"Person","name":"davidleejy"},"datePublished":"2018-08-23T03:07:45.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/11919/matplotlib/issues/11919"}