chap 4 updated.

README.md

@@ -6,6 +6,8 @@
 
 - Network Science, Barabási, 2013
 
+<img src="cover.jpeg" alt="Cover Image" width="300" height="auto">
+
 #### How to use 
 - using on Colab (Recommended)
 

docs/examples/chap_04.ipynb

@@ -142,10 +142,51 @@
     "from netsci.utils import list_sample_graphs, load_sample_graph\n",
     "from netsci.analysis import graph_info\n",
     "\n",
+    "# on colab:\n",
+    "nets = ['Collaboration', 'Internet', 'PowerGrid', 'Protein', 'PhoneCalls', 'Citation', 'Metabolic', 'Email', 'WWW', 'Actor']\n",
+    "\n",
+    "# on local:\n",
     "nets = list(list_sample_graphs().keys())\n",
     "print(nets)"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "#### On Google Colab only"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from google.colab import drive\n",
+    "import os\n",
+    "\n",
+    "# URL of the zip file to be downloaded\n",
+    "url = \"https://networksciencebook.com/translations/en/resources/networks.zip\"\n",
+    "# Mount Google Drive\n",
+    "drive.mount('/content/drive')\n",
+    "# Create the 'network_science' directory in MyDrive if it doesn't exist\n",
+    "network_science_dir = '/content/drive/MyDrive/network_science'\n",
+    "os.makedirs(network_science_dir, exist_ok=True)\n",
+    "# empty the directory\n",
+    "!rm -rf /content/drive/MyDrive/network_science/*\n",
+    "# Change directory to 'network_science'\n",
+    "os.chdir(network_science_dir)\n",
+    "# Download the zip file to the 'network_science' directory\n",
+    "!wget $url -O networks.zip\n",
+    "# Unzip the downloaded file in the 'network_science' directory\n",
+    "!unzip networks.zip\n",
+    "\n",
+    "json_file = \"https://raw.githubusercontent.com/Ziaeemehr/netsci/main/netsci/datasets/sample_graphs.json\"\n",
+    "# download json file\n",
+    "!wget $json_file -O sample_graphs.json"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 5,
@@ -182,7 +223,7 @@
     "from scipy.stats import poisson\n",
     "\n",
     "\n",
-    "G_collab = load_sample_graph(\"Collaboration\")\n",
+    "G_collab = load_sample_graph(\"Collaboration\") # on colab: add colab_path=network_science_dir\n",
     "graph_info(G_collab, quick=True)\n",
     "degrees = list(dict(G_collab.degree()).values())\n",
     "degree_count = Counter(degrees)\n",
@@ -450,7 +491,7 @@
     "from netsci.utils import load_sample_graphi\n",
     "\n",
     "# download_sample_dataset()\n",
-    "sample_graph_names = list(list_sample_graphs().keys())\n",
+    "sample_graph_names = list(list_sample_graphs().keys()) # not on colab\n",
     "sample_graph_names"
    ]
   },
@@ -472,7 +513,7 @@
     "graphs = {}\n",
     "\n",
     "for name in tqdm(sample_graph_names, desc=\"processing graphs\"):\n",
-    "    G = load_sample_graphi(name)\n",
+    "    G = load_sample_graphi(name) # on colab: add colab_path=network_science_dir\n",
     "    directed = G.is_directed()\n",
     "    if directed:\n",
     "        in_degrees = G.degree(mode=\"in\")\n",