diff --git a/index.ipynb b/index.ipynb
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+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import matplotlib.pyplot as plt\n",
+    "import numpy as np\n",
+    "from ipywidgets import interact\n",
+    "from ipywidgets.widgets import IntSlider, Dropdown\n",
+    "plt.ion()"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Ipywidgets"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "data = np.logspace(0, 2, 100)\n",
+    "data = np.tile(data, [100, 1])\n",
+    "data += np.random.randn(100, 100) * 50\n",
+    "data += np.linspace(0, 1000, 100)[:, np.newaxis]"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "application/vnd.jupyter.widget-view+json": {
+       "model_id": "14bcec67909a43598eaca5a05a8f5e30",
+       "version_major": 2,
+       "version_minor": 0
+      },
+      "text/plain": [
+       "interactive(children=(IntSlider(value=0, description='ii', max=99), Dropdown(description='cmap', options=('coo…"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
+   "source": [
+    "cmaps = ['coolwarm', 'viridis', 'magma']\n",
+    "def plot_data(ii, cmap):\n",
+    "    fig, ax = plt.subplots()\n",
+    "    cmap = plt.get_cmap(cmap)\n",
+    "    color = cmap(ii / 100.)\n",
+    "    ax.plot(data[ii], color=color)\n",
+    "    ax.set_ylim([0, 1000])\n",
+    "    plt.show()\n",
+    "    \n",
+    "p = interact(plot_data, ii=IntSlider(0, 0, 99), cmap=Dropdown(options=cmaps))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "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": "3.7.3"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}