Improve NumPy example

Author: martinRenou

examples/numpy_heatmap.ipynb

@@ -21,7 +21,7 @@
     "y, x = np.mgrid[slice(1, 5 + dy, dy),\n",
     "                slice(1, 5 + dx, dx)]\n",
     "\n",
-    "z = np.sin(x)**0 + np.cos(0 + y*x) * np.cos(x)"
+    "z = np.sin(x)**10 + np.cos(0 + y*x) * np.cos(x)"
    ]
   },
   {
@@ -44,7 +44,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "n_pixels = 10\n",
+    "n_pixels = 5\n",
     "\n",
     "canvas = Canvas(size=(z.shape[0] * n_pixels, z.shape[1] * n_pixels))\n",
     "canvas"
@@ -84,10 +84,10 @@
     "from time import sleep\n",
     "\n",
     "for i in range(11):\n",
-    "    z = np.sin(x)**i + np.cos(i + y*x) * np.cos(x)\n",
+    "    z = np.sin(x)**10 + np.cos(i + y*x) * np.cos(x)\n",
     "    draw()\n",
     "    \n",
-    "    sleep(0.5)"
+    "    sleep(0.1)"
    ]
   },
   {