How I make my animations

anim.ipynb

{
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  {
   "cell_type": "code",
   "execution_count": 21,
   "metadata": {},
   "outputs": [],
   "source": [
    "import numpy as np\n",
    "import matplotlib\n",
    "matplotlib.use('Agg')\n",
    "import matplotlib.pyplot as plt"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 55,
   "metadata": {},
   "outputs": [],
   "source": [
    "frames = 240\n",
    "f = np.sin\n",
    "a = 0\n",
    "b = 4 * np.pi\n",
    "x = np.linspace(a, b, frames, endpoint=True)\n",
    "y = f(x)\n",
    "y_max = y.max() + (y.max() - y.min()) / 3\n",
    "y_min = y.min() - (y.max() - y.min()) / 3"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 56,
   "metadata": {},
   "outputs": [],
   "source": [
    "for k in range(frames):\n",
    "    plt.figure()\n",
    "    plt.ylim((y_min, y_max))\n",
    "    plt.xlim((a, b))\n",
    "    \n",
    "    x = np.linspace(a, b, frames, endpoint=True)\n",
    "    plt.plot(x[:k], f(x)[:k]);\n",
    "    \n",
    "    plt.gca().spines['right'].set_visible(False)\n",
    "    plt.gca().spines['top'].set_visible(False)\n",
    "    \n",
    "    plt.savefig('sin/out_' + str(k) + '.png');\n",
    "    plt.close('all')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 57,
   "metadata": {},
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       "[]"
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     },
     "execution_count": 57,
     "metadata": {},
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   ],
   "source": [
    "%%system\n",
    "ffmpeg -loglevel warning -y -i sin/out_%d.png -c:v libx264 -vf fps=30 -pix_fmt yuv420p sin.mp4"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 58,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<video autoplay loop controls>\n",
       "      <source src=\"sin.mp4\" type=\"video/mp4\">\n",
       "</video>\n"
      ],
      "text/plain": [
       "<IPython.core.display.HTML object>"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "%%HTML\n",
    "<video autoplay loop controls>\n",
    "      <source src=\"sin.mp4\" type=\"video/mp4\">\n",
    "</video>"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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