{
  "cells": [
    {
      "cell_type": "markdown",
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      "source": [
        "\n# Fill spiral\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "import matplotlib.pyplot as plt\nimport numpy as np\n\ntheta = np.arange(0, 8*np.pi, 0.1)\na = 1\nb = .2\n\nfor dt in np.arange(0, 2*np.pi, np.pi/2.0):\n\n    x = a*np.cos(theta + dt)*np.exp(b*theta)\n    y = a*np.sin(theta + dt)*np.exp(b*theta)\n\n    dt = dt + np.pi/4.0\n\n    x2 = a*np.cos(theta + dt)*np.exp(b*theta)\n    y2 = a*np.sin(theta + dt)*np.exp(b*theta)\n\n    xf = np.concatenate((x, x2[::-1]))\n    yf = np.concatenate((y, y2[::-1]))\n\n    p1 = plt.fill(xf, yf)\n\nplt.show()"
      ]
    }
  ],
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      "display_name": "Python 3",
      "language": "python",
      "name": "python3"
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      "file_extension": ".py",
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