René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Dotted grid lines in v2.0.0b1","articleBody":"After installing v2.0.0b1 into my conda installation (Mac OS X 10.11.5, Python 2.7.11, Anaconda 2.3.0), I noticed a subtle problem with dotted lines in grids. I used the following code to generate the two attached images in v1.5.1 and v2.0.0b1, respectively:\n\n```\nimport numpy as np\nimport matplotlib.pyplot as plt\n\nx = np.array([1, 1, 1, 2, 2, 2, 3, 3, 3])\ny = np.array([1, 2, 3, 1, 2, 3, 1, 2, 3])\na = np.array([1, 2, 3, 4, 5, 6, 7, 8, 9])\ngrid = a.reshape(3, 3)\n\nplt.imshow(grid, extent=(x.min(), x.max(), y.min(), y.max()),interpolation='bicubic')\nplt.grid(linestyle='dotted')\nplt.show()\n```\n\nIf you blow up the new image, alternate dots are linked by a faint gray line, whereas the old dots are clearly separated. Overlaid on some plots, this can make the gridlines look more like dashed lines. \n![old-matplotlib-grid](https://cloud.githubusercontent.com/assets/1193959/15687413/25542ad6-273a-11e6-8ecf-a626293eec2b.png)\n![new-matplotlib-grid](https://cloud.githubusercontent.com/assets/1193959/15687415/27e68e74-273a-11e6-982e-78b4bd13810b.png)\n","author":{"url":"https://github.com/rayosborn","@type":"Person","name":"rayosborn"},"datePublished":"2016-05-31T19:16:20.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":8},"url":"https://github.com/6515/matplotlib/issues/6515"}