René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"colorbar labelling bug (1.5 regression)","articleBody":"This is 1.5 regression, the following test script works in 1.4.3.\n\nThe bug only occurs when using a custom colormap.\n\n```\nimport matplotlib.pyplot as plt\nimport numpy as np\nfrom matplotlib import mlab, cm, colors\n# make up fake data.\ndelta = 0.5\nx = np.arange(-3.0, 4.001, delta)\ny = np.arange(-4.0, 3.001, delta)\nX, Y = np.meshgrid(x, y)\nZ1 = mlab.bivariate_normal(X, Y, 1.0, 1.0, 0.0, 0.0)\nZ2 = mlab.bivariate_normal(X, Y, 1.5, 0.5, 1, 1)\nZ = (Z1 - Z2) * 20000 ; Z -= Z.min(); Z *= 0.5\n# levels to contour\nclevs = [0,2,5,10,20,50,100,300,500,700,1000,1500,2000,2500,3000,3500]\n# contour data, make colorbar\nfig = plt.figure(figsize=(9.,6.3))\ncolorst =\\\n['White','#E4FFFF','#C4E8FF','#8FB3FF','#D8F9D8','#A6ECA6','#42F742','Yellow','Gold',\\\n 'Orange','#FCD5D9','#F6A3AE','#FA5257','Orchid','#AD8ADB','#A449FF','LightGray']\ncustom_cm = colors.ListedColormap(colorst, name='colorst', N=None)\nax = fig.add_axes([0.03,.12,0.94,.83])\ncs = plt.contourf(X, Y, Z, clevs, colors=colorst)\ncax = fig.add_axes([0.1,0.05,0.8,0.03])\ncbar = fig.colorbar(cs,extend='neither', \\\n      orientation='horizontal',cax=cax,drawedges=True,ticks=clevs)\nplt.show()\n```\n\nThe resulting image\n\n![colorbar_bug](https://cloud.githubusercontent.com/assets/579593/11786991/d9057536-a246-11e5-844a-453c7c9f73f8.png)\n\ndoes not show all the colorbar labels.\n","author":{"url":"https://github.com/jswhit","@type":"Person","name":"jswhit"},"datePublished":"2015-12-14T16:42:09.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/5673/matplotlib/issues/5673"}