import networkx as nx import random # 读入edge文件，构建图结构 graph = {} with open("./edge/football.edge", "r") as f: for line in f: u, v = line.strip().split() if u not in graph: graph[u] = [] if v not in graph: graph[v] = [] graph[u].append(v) graph[v].append(u) # 随机选择一个节点作为感染源 infected = random.choice(list(graph.keys())) print("Infected node:", infected) # 初始化每个节点的感染状态 status = {} for node in graph: status[node] = "S" status[infected] = "I" # SI模型参数 p = 0.5 # 感染过程 while True: changed = False for node in graph: if status[node] == "I": for neighbor in graph[node]: if status[neighbor] == "S" and random.random() < p: status[neighbor] = "I" changed = True if not changed: break # 输出每个节点的感染状态和邻居 for node in graph: print(node, status[node], graph[node])之后续写一个加入观测节点的溯源代码并可视化

import networkx as nx import random # 读入edge文件，构建图结构 graph = {} with open("./edge/football.edge", "r") as f: for line in f: u, v = line.strip().split() if u not in graph: graph[u] = [] if v not in graph: graph[v] = [] graph[u].append(v) graph[v].append(u) # 随机选择一个节点作为感染源 infected = random.choice(list(graph.keys())) print("Infected node:", infected) # 初始化每个节点的感染状态 status = {} for node in graph: status[node] = "S" status[infected] = "I" # SI模型参数 p = 0.5 # 感染过程 while True: changed = False for node in graph: if status[node] == "I": for neighbor in graph[node]: if status[neighbor] == "S" and random.random() < p: status[neighbor] = "I" changed = True if not changed: break # 输出每个节点的感染状态和邻居 for node in graph: print(node, status[node], graph[node])

其中，通过读取一个edge文件构建了一个图结构，然后随机选择一个节点作为感染源，初始化每个节点的感染状态为“S”（易感染状态）或“I”（感染状态）。接着，通过SI模型参数p来模拟感染过程，当一个节点处于感染...

import networkx as nx import matplotlib.pyplot as plt # 创建图 G = nx.Graph()

# 添加节点 G.add_node(1) G.add_node(2) G.add_node(3) # 添加边 G.add_edge(1, 2) G.add_edge(2, 3) G.add_edge(3, 1) # 绘制图形 nx.draw(G, with_labels=True) plt.show()

import networkx as nx import matplotlib.pyplot as plt # create graph object G = nx.Graph() # add nodes G.add_node('A') G.add_node('B') G.add_node('C') G.add_node('D') # add edges with weights G.add_edge('A', 'B', weight=5) G.add_edge('A', 'C', weight=7) G.add_edge('B', 'D', weight=6) G.add_edge('C', 'D', weight=3) # define node positions (optional) pos = {'A': (0, 0), 'B': (1, 1), 'C': (-1, 1), 'D': (0, 2)} # draw nodes and edges with labels nx.draw_networkx_nodes(G, pos) nx.draw_networkx_edges(G, pos) nx.draw_networkx_labels(G, pos) edge_labels = nx.get_edge_attributes(G, 'weight') nx.draw_networkx_edge_labels(G, pos, edge_labels=edge_labels) plt.axis('off') plt.show()

import networkx as nx import matplotlib.pyplot as plt # 创建一个带权图 G = nx.Graph() # 添加节点 G.add_node('A') G.add_node('B') G.add_node('C') G.add_node('D') # 添加带权边 G.add_edge('A', 'B', ...

import networkx as nx # 构造一个弦图 G = nx.Graph() G.add_edges_from([(1, 2), (1, 3), (2, 3), (3, 4), (4, 5), (4, 6), (5, 6)]) # 判断是否为弦图 print(nx.is_chordal(G)) # 输出 True # 获取最大团 cliques = nx.chordal_graph_cliques(G) max_clique = max(cliques, key=len) print(max_clique) # 输出 [3, 4, 5, 6] # 计算树宽 treewidth = nx.chordal_graph_treewidth(G) print(treewidth) # 输出 2

import networkx as nx # 构造一个弦图 G = nx.Graph() G.add_edges_from([(1, 2), (1, 3), (2, 3), (3, 4), (4, 5), (4, 6), (5, 6)]) # 判断是否为弦图 print(nx.is_chordal(G)) # 输出 True # 获取最大团 ...

import pandas as pd import networkx as nx import matplotlib # 读取Excel表格并转化为邻接矩阵 df = pd.read_excel('E:/Download/.Download/2023年杭州电子科技大学第十三届研究生数学建模竞赛题/HDUGMCM-2023-Problem-B：多无人车协同快递配送问题/附件/附件1.xlsx', header=None) adjacency_matrix = df.values[1:, 1:] # 创建无向图 G = nx.Graph() # 添加节点 for i in range(1, len(adjacency_matrix) + 1): G.add_node(i, pos=(df.values[i, 0], df.values[0, i])) # 添加边 for i in range(len(adjacency_matrix)): for j in range(i, len(adjacency_matrix)): if adjacency_matrix[i][j] > 0: G.add_edge(i+1, j+1, weight=adjacency_matrix[i][j]) # 绘制图形 pos = nx.get_node_attributes(G, 'pos') nx.draw(G, pos, with_labels=True, node_size=50) labels = nx.get_edge_attributes(G, 'weight') nx.draw_networkx_edge_labels(G, pos, edge_labels=labels) plt.show()代码改正

import networkx as nx import matplotlib.pyplot as plt # 读取Excel表格并转化为邻接矩阵 df = pd.read_excel('E:/Download/.Download/2023年杭州电子科技大学第十三届研究生数学建模竞赛题/HDUGMCM-2023-...

import networkx as nxfrom sklearn.model_selection import train_test_splitfrom networkx.algorithms.link_prediction import katz_similarityfrom sklearn.metrics import roc_auc_score, average_precision_score# 加载数据集edges = []with open("email-Eu-core.txt") as f: for line in f: if line.startswith("#"): continue edge = line.strip().split() edges.append((int(edge[0]), int(edge[1])))# 划分训练集和测试集train_edges, test_edges = train_test_split(edges, test_size=0.1, random_state=42)# 构建无向图graph = nx.Graph()graph.add_edges_from(train_edges)# 计算相似度katz_scores = katz_similarity(graph, max_l=200, beta=0.01)# 计算AUC值y_true = [1 if edge in test_edges else 0 for edge in graph.edges()]y_scores = [katz_scores[edge] for edge in graph.edges()]auc = roc_auc_score(y_true, y_scores)# 计算Precisionk = 100top_k_edges = sorted(graph.edges(), key=lambda x: katz_scores[x], reverse=True)[:k]y_true = [1 if edge in test_edges else 0 for edge in top_k_edges]y_scores = [katz_scores[edge] for edge in top_k_edges]precision = average_precision_score(y_true, y_scores)print("Katz Algorithm")print("AUC: {:.4f}".format(auc))print("Precision@{}: {:.4f}".format(k, precision))有什么问题

应该在 import networkx as nx 后添加一个换行符。另外，代码中的 katz_similarity() 函数调用中使用了一个 max_l 参数，这个参数是不必要的，可以直接去掉，因为该函数不支持传递该参数。最后，代码未定义...

import networkx as nx from neo4j import GraphDatabase from torch_geometric.data import Data # Connect to Neo4j database driver = GraphDatabase.driver(uri, auth=(username, password)) # Define a Cypher query to retrieve nodes and relationships from Neo4j query = """ MATCH (n)-[r]->(m) RETURN id(n) AS source, id(m) AS target, type(r) AS edge_type, labels(n) AS source_labels, labels(m) AS target_labels, properties(n) AS source_props, properties(m) AS target_props """ # Execute the query and retrieve the results with driver.session() as session: results = session.run(query) # Convert the query results to a NetworkX graph graph = nx.MultiDiGraph() for record in results: graph.add_edge(record['source'], record['target'], key=record['edge_type'], source_labels=record['source_labels'], target_labels=record['target_labels'], source_props=record['source_props'], target_props=record['target_props']) # Convert the NetworkX graph to a PyTorch Geometric Data object x = [] edge_index = [] edge_attr = [] for node in graph.nodes(): node_attrs = [] for label in graph.nodes[node]['labels']: node_attrs.append(label) for prop in graph.nodes[node]['source_props']: node_attrs.append(prop) x.append(node_attrs) for source, target, data in graph.edges(keys=True, data=True): edge_index.append([source, target]) edge_attrs = [] for label in data['source_labels']: edge_attrs.append(label) for prop in data['properties']: edge_attrs.append(prop) edge_attr.append(edge_attrs) data = Data(x=torch.tensor(x), edge_index=torch.tensor(edge_index).t().contiguous(), edge_attr=torch.tensor(edge_attr))详细注释

import networkx as nx from neo4j import GraphDatabase from torch_geometric.data import Data # 连接到Neo4j数据库 driver = GraphDatabase.driver(uri, auth=(username, password)) # 定义一个Cypher查询语句...

import pandas as pd import numpy as np import networkx as nx # 读取Excel文件中的邻接矩阵 adjacency_matrix = pd.read_excel('output.xlsx', index_col=0) # 将邻接矩阵转换为numpy数组 adjacency_matrix = adjacency_matrix.to_numpy() # 创建有向图对象 G = nx.DiGraph(adjacency_matrix) def preprocess(G): p = 0 directedGraph = nx.DiGraph() for u in G.nodes(): for v in G.neighbors(u): if (v != u): # propProb = G.number_of_edges(u, v) / G.in_degree(v) propProb = G.number_of_edges(u, v) / G.degree(v) directedGraph.add_edge(u, v, pp=propProb) # p += propProb # print(propProb) # print('平均阈值：', p/2939) return directedGraph def simulate(G, seedNode, propProbability): newActive = True currentActiveNodes = copy.deepcopy(seedNode) newActiveNodes = set() activatedNodes = copy.deepcopy(seedNode) # Biar ga keaktivasi 2 kali influenceSpread = len(seedNode) while (newActive): for node in currentActiveNodes: for neighbor in G.neighbors( node): # Harus dicek udah aktif apa belom, jangan sampe ngaktifin yang udah aktif if (neighbor not in activatedNodes): if (G[node][neighbor]['pp'] > propProbability): # flipCoin(propProbability) newActiveNodes.add(neighbor) activatedNodes.append(neighbor) influenceSpread += len(newActiveNodes) if newActiveNodes: currentActiveNodes = list(newActiveNodes) newActiveNodes = set() else: newActive = False # print("activatedNodes",len(activatedNodes),activatedNodes) return influenceSpread def flipCoin(probability): return random.random() < probability解释一下这个代码

首先，它读取一个Excel文件，其中包含了一个邻接矩阵，表示图中节点之间的连接关系。然后，将邻接矩阵转换为numpy数组，并创建一个有向图对象。 preprocess函数用于预处理图对象，它遍历所有节点，并计算每条边的...

import pandas as pd import numpy as np import networkx as nx import matplotlib.pyplot as plt # 读取Excel文件中的邻接矩阵 adjacency_matrix = pd.read_excel('output.xlsx', index_col=0) # 将邻接矩阵转换为numpy数组 adjacency_matrix = adjacency_matrix.to_numpy() # 创建有向图对象 G = nx.DiGraph(adjacency_matrix) def preprocess(G): p = 0 directedGraph = nx.DiGraph() for u in G.nodes(): for v in G.neighbors(u): if (v != u): propProb = G.number_of_edges(u, v) / G.degree(v) directedGraph.add_edge(u, v, pp=propProb) return directedGraph def simulate(G, seedNode, propProbability): newActive = True currentActiveNodes = seedNode.copy() newActiveNodes = set() activatedNodes = seedNode.copy() influenceSpread = len(seedNode) while newActive: for node in currentActiveNodes: for neighbor in G.neighbors(node): if neighbor not in activatedNodes: if G[node][neighbor]['pp'] > propProbability: newActiveNodes.add(neighbor) activatedNodes.append(neighbor) influenceSpread += len(newActiveNodes) if newActiveNodes: currentActiveNodes = list(newActiveNodes) newActiveNodes = set() else: newActive = False return influenceSpread def flipCoin(probability): return np.random.random() < probability # 可视化传播过程 def visualizePropagation(G, seedNode, propProbability): pos = nx.spring_layout(G) # 选择布局算法 labels = {node: node for node in G.nodes()} # 节点标签为节点名 colors = ['r' if node in seedNode else 'b' for node in G.nodes()] # 种子节点为红色，其他节点为蓝色 plt.figure(figsize=(10,6)) nx.draw_networkx_nodes(G, pos, node_color=colors) nx.draw_networkx_edges(G, pos) nx.draw_networkx_labels(G, pos, labels) plt.title('Propagation Visualization') plt.show() # 示例用法 seedNode = [7,36,17] propProbability = 0.7 directedGraph = preprocess(G) influenceSpread = simulate(directedGraph, seedNode, propProbability) print("Influence Spread:", influenceSpread) visualizePropagation(directedGraph, seedNode, propProbability)修改这个代码使得输出图形节点之间间隔合理能够看清

你可以尝试修改nx.spring_layout()函数的参数，例如k，来调整节点之间的距离。这个参数控制着节点之间的斥力大小，较大的k值会使节点之间的距离增大，从而使得图形更容易观察。下面是修改后的代码示例： ...

import networkx as nximport matplotlib.pyplot as plt# 读取人物关系数据with open('characters.txt', 'r') as f: data = f.readlines()# 创建空的Graph对象G = nx.Graph()# 添加节点和边for line in data: characters = line.strip().split(',') for i in range(len(characters)): if not G.has_node(characters[i]): G.add_node(characters[i]) for j in range(i+1, len(characters)): if not G.has_node(characters[j]): G.add_node(characters[j]) if not G.has_edge(characters[i], characters[j]): G.add_edge(characters[i], characters[j])# 绘制图形pos = nx.spring_layout(G)nx.draw(G, pos, with_labels=True, font_size=10, node_size=500, node_color='lightblue', edge_color='gray')plt.show()

这是Python中导入networkx和matplotlib.pyplot模块的语句。networkx是一个用于创建、操作和研究复杂网络的Python库，而matplotlib.pyplot是一个用于绘制图形的Python库。

import pandas as pd import numpy as np import networkx as nx import matplotlib.pyplot as plt df = pd.read_excel(r"C:\Users\li'yi'jie\Desktop\运筹学网络规划数据.xlsx") edges = [] for i in range(len(df)): edge = { "id": df.loc[i, "边的编号"], "tail": df.loc[i, "边的尾节点"], "head": df.loc[i, "边的头节点"], "length": df.loc[i, "长度"], "capacity": df.loc[i, "容量"] } edges.append(edge) plt.figure(figsize=(15,15)) G = nx.DiGraph() for edge in edges: G.add_edge(edge["tail"], edge["head"], weight=edge["length"]) all_pairs = dict(nx.all_pairs_dijkstra_path_length(G)) pos = nx.spring_layout(G) nx.draw(G, pos, with_labels=True) labels = nx.get_edge_attributes(G, "weight") nx.draw_networkx_edge_labels(G, pos, edge_labels=labels) #nx.draw_networkx_edge_labels(G, pos, edge_labels=labels, label_pos=0.3) plt.show() # 使用Floyd算法求解所有顶点对之间的最短路长度 dist = nx.floyd_warshall(G) # 将结果写入Excel文件中 rows = [] for i, row in enumerate(dist): for j, value in enumerate(row): rows.append({"起始节点": i, "终止节点": j, "最短路长度": value}) df_result = pd.DataFrame(rows) df_result.to_excel(r"C:\Users\li'yi'jie\Desktop\最短路径结果.xlsx", index=False)报错TypeError: 'numpy.int64' object is not iterable如何修改？

# 将结果写入Excel文件中 rows = [] for i, row in enumerate(dist): for j, value in enumerate(list(row)): # 将row转换为列表类型 rows.append({"起始节点": i, "终止节点": j, "最短路长度": value}) df_...

G_tmp = nx.read_edgelist('../input/google-web-graph/web-Google.txt', create_using = nx.DiGraph)啥意思

其中，'../input/google-web-graph/web-Google.txt' 是文件路径，create_using = nx.DiGraph 表示创建一个有向图对象。这段代码的作用是将文件中的边列表读入内存，以便后续进行图分析和处理。

import networkx as nx

import networkx as nx 是Python中用于导入networkx库的语句。networkx是一个用于创建、操作和分析复杂网络的Python库。它提供了许多用于构建和分析图形的工具和算法，包括图形可视化、图形布局、图形分析等。使用...

import pandas as pd import networkx as nx import matplotlib.pyplot as plt df = pd.read_excel(r"C:\Users\li'yi'jie\Desktop\运筹学网络规划数据.xlsx") edges = [] for i in range(len(df)): edge = { "id": df.loc[i, "边的编号"], "tail": df.loc[i, "边的尾节点"], "head": df.loc[i, "边的头节点"], "length": df.loc[i, "长度"], "capacity": df.loc[i, "容量"] } edges.append(edge) G = nx.DiGraph() for edge in edges: G.add_edge(edge["tail"], edge["head"], weight=edge["length"]) all_pairs = dict(nx.all_pairs_dijkstra_path_length(G)) pos = nx.spring_layout(G) nx.draw(G, pos, with_labels=True) labels = nx.get_edge_attributes(G, "长度") nx.draw_networkx_edge_labels(G, pos, edge_labels=labels) plt.show()如何修改使生成的网络图的边旁标注权重？

可以在代码最后添加以下语句： ...其中 labels 变量用于获取图 G 中所有边的权重信息，nx.draw_networkx_edge_labels() 函数用于在图形中绘制边旁的权重标签。最后使用 plt.show() 函数显示图形即可。

import pandas as pd import networkx as nx # 读取数据 data = pd.read_excel('附件1.xlsx') # 构建有向图 G = nx.DiGraph() for _, row in data.iterrows(): source = row['发货城市'] target = row['收货城市'] weight = row['快递数量'] if not G.has_edge(source, target): G.add_edge(source, target, weight=weight) else: G[source][target]['weight'] += weight # 计算节点的入度和出度 in_degree = dict(G.in_degree(weight='weight')) out_degree = dict(G.out_degree(weight='weight')) # 归一化处理 total_in = sum(in_degree.values()) total_out = sum(out_degree.values()) for node in G.nodes(): if total_in > 0: in_degree[node] /= total_in if total_out > 0: out_degree[node] /= total_out # 计算 PageRank 值 pr = nx.pagerank(G, weight='weight') # 排序输出结果 result = sorted(pr.items(), key=lambda x: x[1], reverse=True)[:5] for i, (node, score) in enumerate(result): print(f'{i+1}. {node} ({score:.4f})')

这段代码是使用 Python 的 pandas 和 networkx 库读取 Excel 中的数据，构建有向图，并进行 PageRank 计算，最后输出 PageRank 值最高的前五个节点。具体步骤如下： 1. 读取 Excel 中的数据，存储在一个 pandas ...

NetworkX 2.3 开发文档：图算法与数据结构详解

6. **数据结构**：NetworkX提供了多种数据结构，如图（Graph）、有向图（DiGraph）、多重图（MultiGraph）和有向多重图（MultiDiGraph），每种数据结构都有其特定的应用场景。 7. **图类型**：文档详细解释了不同...

Python NetworkX 实现：有向图、多图与图生成器解析

- NetworkX提供了一系列的图生成器，可以用来快速构建常见的图结构，如完全图、随机图、树等。 - 常见的图操作包括添加和删除节点、边，以及查询图的属性，如节点度、边权重等。 - 对于有向图，可以使用Graph.to...

相关推荐

Python NetworkX包详解：创建与操作图结构

Python编程入门：利用networkx操作图数据结构

Python网络x入门：构建与操作复杂图结构

import networkx as nx import matplotlib.pyplot as plt # 创建图 G = nx.Graph()

G_tmp = nx.read_edgelist('../input/google-web-graph/web-Google.txt', create_using = nx.DiGraph)啥意思

import networkx as nx

NetworkX 2.3 开发文档：图算法与数据结构详解

Python NetworkX 实现：有向图、多图与图生成器解析

最新推荐

Python Matplotlib 基于networkx画关系网络图

潮流计算+二阶锥松弛+对偶形式的matlab源码+对偶理论说明文档.zip

Java贪吃蛇小游戏.zip学习资料资源

WordPress作为新闻管理面板的实现指南

管理建模和仿真的文件

函数与模块化编程宝典：J750编程高效之路

用C语言求有4个圆塔，圆心分别为（2，2)，(2，-2)，(-2，2)，(-2，-2)圆半径为1， 这4个塔的高度为10m 塔以外无建筑物接输入任意点的坐标 求该点的建筑高度（塔外的高度为零)的程序

NPC_Generator：使用Ruby打造的游戏角色生成器

"互动学习：行动中的多样性与论文攻读经历"

流程控制与循环结构详解：J750编程逻辑构建指南

用C语言求有4个圆塔，圆心分别为（2，2)，(2，-2)，(-2，2)，(-2，-2)圆半径为1，这4个塔的高度为10m 塔以外无建筑物接输入任意点的坐标求该点的建筑高度（塔外的高度为零)的程序