another fix V10_kalmanfilter_demonstration.ipynb

sys2-jupyter-notebooks/lecture_examples/V10_kalmanfilter_demonstration.ipynb

@@ -215,7 +215,7 @@
     "    plt.show()\n",
 	"\n",
     "\n",
-	"interactive_plot = interactive(update, sigma=(0.1, 2, 0.1), u = ["on","off"], xo=(-10, 10, 1), Q=[1, 0.1, 0.01, 0.001, 1e-4, 1e-5, 1e-6, 1e-7, 1e-8, 1e-9, 1e-10], R=(0.01, 1, 0.01), Pk=(0.01, 10, 0.01))\n",
+	"interactive_plot = interactive(update, sigma=(0.1, 2, 0.1), u = [\"on\",\"off\"], xo=(-10, 10, 1), Q=[1, 0.1, 0.01, 0.001, 1e-4, 1e-5, 1e-6, 1e-7, 1e-8, 1e-9, 1e-10], R=(0.01, 1, 0.01), Pk=(0.01, 10, 0.01))\n",
 	"interactive_plot"
    ]
   },