在NetworkX中访问Multigraph的属性 [英] Access attributes of a Multigraph in NetworkX

问题描述

我正在使用此问题中的代码: networkx -根据边缘属性更改颜色/宽度-结果不一致，因为它几乎可以回答我的问题，但是我正在使用Multigraph，这就是为什么该问题的答案对我没有帮助的原因.

I am using code from this question: networkx - change color/width according to edge attributes - inconsistent result because it almost answers my question, but I am working with a Multigraph, which is why the answer to that question is not helping me.

我需要根据权重绘制线条粗细的图形，但该图形绘制不正确.我确定问题是由于边缘的顺序造成的.这是我的代码:

I need to draw a graph with line thicknesses based on the weights but the graph is being drawn incorrectly. I am sure the problem is because of the order of the edges. Here is my code:

我有一个多重图形，它是由看起来像这样的边组成的:

I have a multigraph which is made up of edges that look like this:

edgies = [(1,2, {'color': 'r'}),(2,3,{'color': 'b'}),(3,4,{'color':'g'})]

G = nx.MultiGraph()

G.add_edges_from(edgies, color = 'color')

pos = nx.circular_layout(G)

edges = G.edges()
colors = [G[u][v]['color'] for u,v in edges]

nx.draw(G, pos, edges=edges, edge_color=colors)
plt.show()

我得到的错误如下:

colors = [G[u][v]['color'] for u,v in edges]
KeyError: 'color'

如果我仅使用图形，则此代码有效，但在使用多图形时会出现错误.如果您需要任何进一步的说明，请告诉我.谢谢.

This code works if I am only using a graph but gives the error when working with a multigraph. Please let me know if you need any further clarification. Thanks.

推荐答案

更改导致错误的行

colors = [print(G[u][v]) for u,v in edges]

我们可以看到您真正在看的是:

We can see what you are actually looking at is:

{0: {'color': 'r'}}
{0: {'color': 'b'}}
{0: {'color': 'g'}}

我假设networkx会将其存储在哪个图上作为键，因此您只需要首先访问键[0]，就像这样:

I assume networkx is storing which graph it is on as the key, so you just need to access key [0] first, like this:

colors = [G[u][v][0]["color"] for u,v in edges]

此访问模式在 https:/上有所记录/networkx.github.io/documentation/networkx-1.9.1/reference/classes.multigraph.html 在边缘部分.

This access pattern is somewhat documented on https://networkx.github.io/documentation/networkx-1.9.1/reference/classes.multigraph.html in the edges section.

这篇关于在NetworkX中访问Multigraph的属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！