-Working through GH filters

-Add rule in gitignore to ignore my python venv

Author: PeterMatthewKohler

.gitignore

@@ -14,4 +14,5 @@ Kalman_and_Bayesian_Filters_in_Python6x9.pdf
 Kalman_and_Bayesian_Filters_in_Python.pdf
 book_files
 tmp
-.pylint.d
+.pylint.d
+venv*

00-Preface.ipynb

@@ -99,7 +99,10 @@
   {
    "cell_type": "markdown",
    "metadata": {
-    "collapsed": true
+    "collapsed": true,
+    "jupyter": {
+     "outputs_hidden": true
+    }
    },
    "source": [
     "## Motivation for this Book\n",
@@ -793,11 +796,21 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 20,
+   "execution_count": 7,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1]\n"
+     ]
+    }
+   ],
    "source": [
-    "# your solution"
+    "# your solution\n",
+    "arr = np.array([0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1,])\n",
+    "print(arr)"
    ]
   },
   {
@@ -973,7 +986,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.7"
+   "version": "3.10.12"
   },
   "nbdime-conflicts": {
    "local_diff": [
@@ -1028,5 +1041,5 @@
   }
  },
  "nbformat": 4,
- "nbformat_minor": 1
+ "nbformat_minor": 4
 }