Add plot saving

Author: magitz

04.2_data_wrangling.ipynb

@@ -171,6 +171,24 @@
     "pd.plotting.scatter_matrix(df)"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### 2.2 Saving plots\n",
+    "\n",
+    "We may want to save the output of a plot. This can be done using the  `plt.savefig()` function. By default, the format will be determined from the filename extension you provide."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "plt.savefil('plot.pdf')"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},