Minor updates to first 3 notebooks

Author: mspieg

00_intro_numerical_methods.ipynb

@@ -203,7 +203,7 @@
    "cell_type": "code",
    "execution_count": null,
    "metadata": {
-    "hide_input": true,
+    "hide_input": false,
     "slideshow": {
      "slide_type": "fragment"
     }

02_NumPy.ipynb

@@ -218,7 +218,8 @@
    "outputs": [],
    "source": [
     "my_vec = numpy.array([[1], [2]])\n",
-    "print(my_vec,my_vec.shape)"
+    "print(my_vec)\n",
+    "print('my vec has shape:{}'.format(my_vec.shape))"
    ]
   },
   {

03_matplotlib.ipynb

@@ -209,7 +209,7 @@
     "y = numpy.linspace(-1, 1, 100)\n",
     "X, Y = numpy.meshgrid(x, y)\n",
     "pi = numpy.pi\n",
-    "F = numpy.sin(3*pi*X)*numpy.cos(2*pi*Y)"
+    "F = numpy.sin(2*pi*X)*numpy.cos(3*pi*Y)"
    ]
   },
   {
@@ -431,7 +431,7 @@
  "metadata": {
   "celltoolbar": "Slideshow",
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -445,7 +445,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.8"
+   "version": "3.11.7"
   },
   "latex_envs": {
    "bibliofile": "biblio.bib",