Publish 3 first notebooks

notebooks/julia_basics.ipynb

@@ -586,6 +586,41 @@
     "x"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "4fc5eb9b",
+   "metadata": {},
+   "source": [
+    "### References\n",
+    "\n",
+    "As you can see variables are passed \"by value\". Passing variables \"by reference\" is done using a reference.\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "6ef5fe2c",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "function q!(x)\n",
+    "    x[] = 2\n",
+    "    x\n",
+    "end"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "ba245808",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "x = Ref(1)\n",
+    "q!(x)\n",
+    "x[]"
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "d20bc3a4",
@@ -1608,9 +1643,7 @@
    "source": [
     "# License\n",
     "\n",
-    "TODO: replace link to website\n",
-    "\n",
-    "This notebook is part of the course [Programming Large Scale Parallel Systems](http://localhost:8000/) at Vrije Universiteit Amsterdam and may be used under a [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) license."
+    "This notebook is part of the course [Programming Large Scale Parallel Systems](https://www.francescverdugo.com/XM_40017/) at Vrije Universiteit Amsterdam and may be used under a [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) license."
    ]
   },
   {