{
  "cells": [
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "\n# Parametric curve\n\nThis example demonstrates plotting a parametric curve in 3D.\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "import matplotlib.pyplot as plt\nimport numpy as np\n\nax = plt.figure().add_subplot(projection='3d')\n\n# Prepare arrays x, y, z\ntheta = np.linspace(-4 * np.pi, 4 * np.pi, 100)\nz = np.linspace(-2, 2, 100)\nr = z**2 + 1\nx = r * np.sin(theta)\ny = r * np.cos(theta)\n\nax.plot(x, y, z, label='parametric curve')\nax.legend()\n\nplt.show()"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        ".. tags::\n   plot-type: 3D,\n   level: beginner\n\n"
      ]
    }
  ],
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    "kernelspec": {
      "display_name": "Python 3",
      "language": "python",
      "name": "python3"
    },
    "language_info": {
      "codemirror_mode": {
        "name": "ipython",
        "version": 3
      },
      "file_extension": ".py",
      "mimetype": "text/x-python",
      "name": "python",
      "nbconvert_exporter": "python",
      "pygments_lexer": "ipython3",
      "version": "3.14.6"
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