bugfix in example, issue #195

Author: benvanwerkhoven

doc/source/matrix_multiplication.ipynb

@@ -314,6 +314,11 @@
     "    int k, kb;\n",
     "\n",
     "    float sum[tile_size_y][tile_size_x];\n",
+    "    for (int i=0; i < tile_size_y; i++) {\n",
+    "        for (int j=0; j < tile_size_x; j++) {\n",
+    "            sum[i][j] = 0.0;\n",
+    "        }\n",
+    "    }    \n",
     "\n",
     "    for (k = 0; k < WIDTH; k += block_size_x) {\n",
     "\n",
@@ -430,7 +435,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -444,7 +449,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.9"
+   "version": "3.9.12"
   }
  },
  "nbformat": 4,