使用igraph的graph.tree函数绘制树 [英] Plot tree with graph.tree function from igraph

问题描述

在igraph软件包的文档中有一个示例

In the docs of igraph package there is an example

igraph.options(plot.layout=layout.reingold.tilford)
plot(graph.tree(20, 2))

输出应将数据表示为树.但是我得到的是

the output should represent data as a tree. But what I get is

推荐答案

您显然需要指定根目录:

You apparently need to specify the root:

library(igraph)
g <- graph.tree(20, 2)
plot(g, layout = layout.reingold.tilford(g, root=1))

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