Question

我正在尝试通过networkx绘制图形。但是，以下代码会遇到错误

NetworkXError：节点8没有位置

我相信只允许少于7个节点，但我不明白为什么。

请说明错误发生的原因以及如何修复以绘制超过8个节点。

import networkx as nx

# new_words = ["1","2","3","4","5","6","7"] => It does not occur the error
new_words = ["1","2","3","4","5","6","7","8"]
target_word = ["0"]

G=nx.cubical_graph()
pos=nx.spring_layout(G)

nx.draw_networkx_nodes(G,pos,
                       nodelist=[0],
                       node_color='r',
                       node_size=50, alpha=0.8)
nx.draw_networkx_nodes(G,pos,
                       nodelist=range(1, len(new_words)+1),
                       node_color='w',
                       node_size=50, alpha=0.8)

nx.draw_networkx_edges(G,pos,
                       edgelist=[(0,i) for i in range(1,len(new_words)+1)])


# some math labels
labels={}
labels[0]=target_word
for idx in range(0,len(new_words)):
    labels[idx+1] = new_words[idx]

nx.draw_networkx_labels(G,pos,labels)

错误消息是：

---------------------------------------------------------------------------
NetworkXError                             Traceback (most recent call last)
<ipython-input-16-5ddab3dbe0d6> in <module>()
     15                        nodelist=range(1, len(new_words)+1),
     16                        node_color='w',
---> 17                        node_size=50, alpha=0.8)
     18 
     19 nx.draw_networkx_edges(G,pos,

/Users/sudou/.pyenv/versions/anaconda-2.0.1/lib/python2.7/site-packages/networkx/drawing/nx_pylab.pyc in draw_networkx_nodes(G, pos, nodelist, node_size, node_color, node_shape, alpha, cmap, vmin, vmax, ax, linewidths, label, **kwds)
    384         xy = numpy.asarray([pos[v] for v in nodelist])
    385     except KeyError as e:
--> 386         raise nx.NetworkXError('Node %s has no position.'%e)
    387     except ValueError:
    388         raise nx.NetworkXError('Bad value in node positions.')

NetworkXError: Node 8 has no position.

Answer 1

nx.cubical_graph()有8个节点。即[0,1,2,3,4,5,6,7]。您已发送包含节点nodelist的{{1}}，该节点不属于您的图表。您绘制的图形是立方体的图形 - 8个节点（顶点）和12个边缘（立方体的边缘）。

您要求它绘制8个节点图的9个节点。因此，它无法找到该节点的位置。

回答关于如何在图表中绘制超过8个节点的问题，您必须从包含8个以上节点的图表开始。

无法通过networkx绘制超过8个节点`NetworkXError：节点8没有位置`错误

1 个答案: