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        "\n# Advanced quiver and quiverkey functions\n\nDemonstrates some more advanced options for `~.axes.Axes.quiver`.  For a simple\nexample refer to :doc:`/gallery/images_contours_and_fields/quiver_simple_demo`.\n\nNote: The plot autoscaling does not take into account the arrows, so\nthose on the boundaries may reach out of the picture.  This is not an easy\nproblem to solve in a perfectly general way.  The recommended workaround is to\nmanually set the Axes limits in such a case.\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
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      "source": [
        "import matplotlib.pyplot as plt\nimport numpy as np\n\nX, Y = np.meshgrid(np.arange(0, 2 * np.pi, .2), np.arange(0, 2 * np.pi, .2))\nU = np.cos(X)\nV = np.sin(Y)"
      ]
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      "execution_count": null,
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      "source": [
        "fig1, ax1 = plt.subplots()\nax1.set_title('Arrows scale with plot width, not view')\nQ = ax1.quiver(X, Y, U, V, units='width')\nqk = ax1.quiverkey(Q, 0.9, 0.9, 2, r'$2 \\frac{m}{s}$', labelpos='E',\n                   coordinates='figure')"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
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      "source": [
        "fig2, ax2 = plt.subplots()\nax2.set_title(\"pivot='middle'; every third arrow; units='inches'\")\nQ = ax2.quiver(X[::3, ::3], Y[::3, ::3], U[::3, ::3], V[::3, ::3],\n               pivot='middle', units='inches')\nqk = ax2.quiverkey(Q, 0.9, 0.9, 1, r'$1 \\frac{m}{s}$', labelpos='E',\n                   coordinates='figure')\nax2.scatter(X[::3, ::3], Y[::3, ::3], color='r', s=5)"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "fig3, ax3 = plt.subplots()\nax3.set_title(\"pivot='tip'; scales with x view\")\nM = np.hypot(U, V)\nQ = ax3.quiver(X, Y, U, V, M, units='x', pivot='tip', width=0.022,\n               scale=1 / 0.15)\nqk = ax3.quiverkey(Q, 0.9, 0.9, 1, r'$1 \\frac{m}{s}$', labelpos='E',\n                   coordinates='figure')\nax3.scatter(X, Y, color='0.5', s=1)\n\nplt.show()"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        ".. admonition:: References\n\n   The use of the following functions, methods, classes and modules is shown\n   in this example:\n\n   - `matplotlib.axes.Axes.quiver` / `matplotlib.pyplot.quiver`\n   - `matplotlib.axes.Axes.quiverkey` / `matplotlib.pyplot.quiverkey`\n\n"
      ]
    }
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