minor edits to 09a, 11 and 17 notebooks

Author: mspieg

09a_ODE_BVP.ipynb

@@ -1731,7 +1731,7 @@
    "cell_type": "code",
    "execution_count": null,
    "metadata": {
-    "hide_input": false,
+    "hide_input": true,
     "slideshow": {
      "slide_type": "-"
     }
@@ -1910,7 +1910,7 @@
     "w = f.copy()\n",
     "print(w)\n",
     "phi = hats(x,nodes)\n",
-    "#w[3] = 1.5\n",
+    "w[3] = 1.5\n",
     "func = w.dot(phi)"
    ]
   },
@@ -2047,7 +2047,7 @@
    "cell_type": "code",
    "execution_count": null,
    "metadata": {
-    "hide_input": false,
+    "hide_input": true,
     "slideshow": {
      "slide_type": "fragment"
     }
@@ -2331,7 +2331,7 @@
     }
    },
    "source": [
-    "It's also not hard to calculate the Mass matrix, but the mechanics is slightly complicated and will take more time to explain properly than we have at the moment.  But here is a bit of code that solves the projection problem"
+    "It's also not hard to calculate the Mass matrix, but the mechanics are slightly complicated and will take more time to explain properly than we have at the moment.  But here is a bit of code that solves the projection problem"
    ]
   },
   {
@@ -2438,6 +2438,7 @@
    "outputs": [],
    "source": [
     "x = numpy.linspace(0., L, 100)\n",
+    "nodes = numpy.linspace(0.,L, 20)\n",
     "phi = hats(x, nodes)\n",
     "\n",
     "func = lambda x: numpy.sin(x)\n",
@@ -2449,7 +2450,7 @@
    "cell_type": "code",
    "execution_count": null,
    "metadata": {
-    "hide_input": false,
+    "hide_input": true,
     "slideshow": {
      "slide_type": "fragment"
     }

11_LA_QR.ipynb

@@ -2787,7 +2787,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.5"
+   "version": "3.8.8"
   },
   "latex_envs": {
    "bibliofile": "biblio.bib",

17_ODE_BVP.ipynb

@@ -20,11 +20,11 @@
    "cell_type": "code",
    "execution_count": null,
    "metadata": {
-    "collapsed": true,
     "init_cell": true,
     "slideshow": {
      "slide_type": "skip"
-    }
+    },
+    "tags": []
    },
    "outputs": [],
    "source": [
@@ -771,7 +771,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.0"
+   "version": "3.8.8"
   },
   "latex_envs": {
    "bibliofile": "biblio.bib",
@@ -782,5 +782,5 @@
   }
  },
  "nbformat": 4,
- "nbformat_minor": 1
+ "nbformat_minor": 4
 }