Add new notebook to TOC

Author: alchemyst

TOC.ipynb

@@ -176,6 +176,7 @@
     "* [Discrete control](2_Control/6_Discrete_control_and_analysis/Discrete%20control.ipynb)\n",
     "* [Discrete PI](2_Control/6_Discrete_control_and_analysis/Discrete%20PI.ipynb)\n",
     "* [Dahlin controller](2_Control/6_Discrete_control_and_analysis/Dahlin%20controller.ipynb)\n",
+    "* [Simple discrete controller simulation](2_Control/6_Discrete_control_and_analysis/Simple%20discrete%20controller%20simulation.ipynb)\n",
     "* [Noise models](2_Control/6_Discrete_control_and_analysis/Noise%20models.ipynb)"
    ]
   },
@@ -223,6 +224,69 @@
     "* [Interactive PID simulation](tclab/TCLab%20PID.ipynb)\n",
     "* [Frequency domain](tclab/Frequency%20domain.ipynb)"
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# tbcontrol\n",
+    "The tbcontrol module contains functions helpful to students learning to solve control problems. It is broken up into submodules."
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## symbolic\n",
+    "* `linearise` attempt to linearise a symbolic expression\n",
+    "* `routh` construct a Routh-Hurwitz array\n",
+    "* `pade` pade approximation\n",
+    "* `ss2tf` determine the transfer function version of a state space realisation\n",
+    "* `sampledvalues` invert the Z transform symbolically\n",
+    "* `evaluate_at_times` evaluate a sympy expression at numeric times (useful for plotting responses)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## numeric\n",
+    "* `skogestad_half` find an approximation of a high order system by Skogestad's half rule"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## plotting\n",
+    "* `cross_axis` create an axis in Matplotlib which has spines going through the origin like a Nyquist diagram would"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## loops\n",
+    "* `feedback` calculate the result of having two blocks in a feedback loop"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## responses\n",
+    "Step responses of certain systems\n",
+    "\n",
+    "* `fopdt` first order plus dead time\n",
+    "* `sopdt` second order plus dead time"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {
@@ -241,7 +305,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.4"
+   "version": "3.7.6"
   }
  },
  "nbformat": 4,