{
  "cells": [
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "\n# 3D surface (checkerboard)\n\nDemonstrates plotting a 3D surface colored in a checkerboard pattern.\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "import matplotlib.pyplot as plt\nimport numpy as np\n\nfrom matplotlib.ticker import LinearLocator\n\nax = plt.figure().add_subplot(projection='3d')\n\n# Make data.\nX = np.arange(-5, 5, 0.25)\nxlen = len(X)\nY = np.arange(-5, 5, 0.25)\nylen = len(Y)\nX, Y = np.meshgrid(X, Y)\nR = np.sqrt(X**2 + Y**2)\nZ = np.sin(R)\n\n# Create an empty array of strings with the same shape as the meshgrid, and\n# populate it with two colors in a checkerboard pattern.\ncolortuple = ('y', 'b')\ncolors = np.empty(X.shape, dtype=str)\nfor y in range(ylen):\n    for x in range(xlen):\n        colors[y, x] = colortuple[(x + y) % len(colortuple)]\n\n# Plot the surface with face colors taken from the array we made.\nsurf = ax.plot_surface(X, Y, Z, facecolors=colors, linewidth=0)\n\n# Customize the z axis.\nax.set_zlim(-1, 1)\nax.zaxis.set_major_locator(LinearLocator(6))\n\nplt.show()"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        ".. tags::\n   plot-type: 3D,\n   styling: color, styling: texture,\n   level: intermediate\n\n"
      ]
    }
  ],
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      "file_extension": ".py",
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