Update example_notebook.ipynb

Author: mikesmic

notebooks/example_notebook.ipynb

@@ -54,7 +54,7 @@
     "from defdap.quat import Quat\n",
     "\n",
     "# try tk, qt, osx (if using mac) or notebook for interactive plots. If none work, use inline\n",
-    "%matplotlib inline"
+    "%matplotlib widget"
    ]
   },
   {
@@ -601,7 +601,7 @@
    },
    "outputs": [],
    "source": [
-    "if ebsd_map.sel_grain == None: \n",
+    "if ebsd_map.sel_grain is None: \n",
     "    ebsd_map.sel_grain = ebsd_map[57]\n",
     "    \n",
     "ebsd_map.sel_grain.build_mis_ori_list()\n",
@@ -1434,7 +1434,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Calculate the z component of rigid body rotation, $$ \\omega_3 = \\frac{F_{12}-F_{21}}{2}, $$ for the HRDIC map. (HINT: the components of deformation gradient (F) are stores in a dic map as f11, f12, etc.)"
+    "Calculate the z component of rigid body rotation, $$ \\omega_3 = \\frac{F_{12}-F_{21}}{2}, $$ for the HRDIC map. (HINT: the deformation gradient (F) can be accessed as numpy array with `dic_map.data.f`)"
    ]
   },
   {