lim_demo.ipynb

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   "source": [
    "%matplotlib inline\n",
    "from matplotlib_inline import backend_inline\n",
    "from mxnet import np, npx\n",
    "import matplotlib.pyplot as plt\n",
    "\n",
    "npx.set_np()\n",
    "\n",
    "def f(x):\n",
    "    return 3* x ** 2 - 4 * x\n",
    "# def f(x):\n",
    "#     return  x ** 4 - 1 / x\n",
    "\n",
    "def use_svg_display():  #@save\n",
    "    \"\"\"使用svg格式在Jupyter中显示绘图\"\"\"\n",
    "    backend_inline.set_matplotlib_formats('svg')\n",
    "    \n",
    "    \n",
    "def set_figsize(figsize=(3.5, 2.5)):  #@save\n",
    "    \"\"\"设置matplotlib的图表大小\"\"\"\n",
    "    use_svg_display()\n",
    "    plt.rcParams['figure.figsize'] = figsize\n",
    "    \n",
    "#@save\n",
    "def set_axes(axes, xlabel, ylabel, xlim, ylim, xscale, yscale, legend):\n",
    "    \"\"\"设置matplotlib的轴\"\"\"\n",
    "    axes.set_xlabel(xlabel)\n",
    "    axes.set_ylabel(ylabel)\n",
    "    axes.set_xscale(xscale)\n",
    "    axes.set_yscale(yscale)\n",
    "    axes.set_xlim(xlim)\n",
    "    axes.set_ylim(ylim)\n",
    "    if legend:\n",
    "        axes.legend(legend)\n",
    "    axes.grid()\n",
    "\n",
    "#@save\n",
    "def plot(X, Y=None, xlabel=None, ylabel=None, legend=None, xlim=None,\n",
    "         ylim=None, xscale='linear', yscale='linear',\n",
    "         fmts=('-', 'm--', 'g-.', 'r:'), figsize=(3.5, 2.5), axes=None):\n",
    "    \"\"\"绘制数据点\"\"\"\n",
    "    if legend is None:\n",
    "        legend = []\n",
    "\n",
    "    set_figsize(figsize)\n",
    "    axes = axes if axes else plt.gca()\n",
    "\n",
    "    # 如果X有一个轴，输出True\n",
    "    def has_one_axis(X):\n",
    "        return (hasattr(X, \"ndim\") and X.ndim == 1 or isinstance(X, list)\n",
    "                and not hasattr(X[0], \"__len__\"))\n",
    "\n",
    "    if has_one_axis(X):\n",
    "        X = [X]\n",
    "    if Y is None:\n",
    "        X, Y = [[]] * len(X), X\n",
    "    elif has_one_axis(Y):\n",
    "        Y = [Y]\n",
    "    if len(X) != len(Y):\n",
    "        X = X * len(Y)\n",
    "    axes.cla()\n",
    "    for x, y, fmt in zip(X, Y, fmts):\n",
    "        if len(x):\n",
    "            axes.plot(x, y, fmt)\n",
    "        else:\n",
    "            axes.plot(y, fmt)\n",
    "    set_axes(axes, xlabel, ylabel, xlim, ylim, xscale, yscale, legend)\n",
    "    \n",
    "\n",
    "x = np.arange(0, 3, 0.1)\n",
    "plot(x, [f(x), 2 * x -3], 'x', 'f(x)', legend=['f(x)', 'Tangent line (x=1)'])"
   ]
  },
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   "execution_count": null,
   "id": "0ccc62d4",
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   "outputs": [],
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