01.get_started.ipynb

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   "source": [
    "# Get started with JupyterLab\n",
    "\n",
    "JupyterLab is a web-based interactive development environment for Jupyter notebooks. It allows you to create and share documents that contain live code, equations, visualizations and narrative text. \n",
    "In this document, we can run python code or shell commands to play sound, make a plot and etc.\n",
    "\n",
    "### Run python code\n",
    "Write any python code and press Shift + Enter to execute the code"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import sys\n",
    "print(sys.version)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Run shell command with prefix `!`\n",
    "For example, run `git pull origin master` to update this notebook from https://github.com/voice-engine/notebook"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "!git pull origin master"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Or use `arecord` to record 3 seconds audio and then play it."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "!arecord -f S16_LE -c 1 -r 48000 -d 3 -Vmono 48k.wav\n",
    "!aplay 48k.wav"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "We can also play the audio on this browser"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import IPython.display as ipd\n",
    "ipd.Audio('48k.wav')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Mix python code with shell commands"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import getpass\n",
    "\n",
    "# get password and install matplotlib\n",
    "print('Input your password to install python3-matplotlib python3-scipy')\n",
    "password = getpass.getpass()\n",
    "\n",
    "# access python variable within shell commands\n",
    "!echo {password} | sudo -S apt install -y python3-matplotlib python3-scipy"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Make a plot"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import numpy as np\n",
    "import matplotlib.pyplot as plt\n",
    "import scipy.io.wavfile\n",
    "\n",
    "data = scipy.io.wavfile.read('48k.wav')\n",
    "plt.plot(data[1])\n",
    "plt.show()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Fixing random state for reproducibility\n",
    "np.random.seed(19680801)\n",
    "\n",
    "# Compute pie slices\n",
    "N = 20\n",
    "theta = np.linspace(0.0, 2 * np.pi, N, endpoint=False)\n",
    "radii = 10 * np.random.rand(N)\n",
    "width = np.pi / 4 * np.random.rand(N)\n",
    "colors = plt.cm.viridis(radii / 10.)\n",
    "\n",
    "ax = plt.subplot(111, projection='polar')\n",
    "ax.bar(theta, radii, width=width, bottom=0.0, color=colors, alpha=0.5)\n",
    "\n",
    "plt.show()"
   ]
  }
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