如何指定R中顶点的标签 [英] how to specify the labels of vertices in R

问题描述

我有一个矩阵如下：

 杰里彼得王
杰里1 0 0 
彼得0 1 0 
 king 1 1 1 
  

现在我试图画出一个图表以下代码的矩阵：

  t < -  read.table（../ data / table.dat） ; 
 adjm < -  data.matrix（t）; 
 g1<  -  graph.adjacency（adjm，add.colnames = NULL）; 
 plot（g1，main =social network，vertex.color =white，edge.color =gray，vertex.size = 8，
 vertex.frame.color =yellow ）; 
  

顶点的标签是id，所以我的问题是如何设置标签顶点由矩阵的dimname？

我试过了代码

  vertex.label = attr（adjm，dimnames）
  

但得到错误的图。

解决方案

有两种方法可以做到这一点：

1. 创建图形对象时，将名称分配给名为 label 的顶点属性。这是 plot.igraph（）在绘图时查找的默认值。

     g1 < -  graph.adjacency（adjm，add.colnames ='label'）
     




2. 使用 V 迭代器提取名称顶点属性，这是如何使用 add.colnames = NULL 。

     plot（g1，main =social network ，vertex.color =white，edge.color =gray，vertex.size = 8，vertex.frame.color =yellow，vertex.label = V（g1）$ name）
     

无论哪种方式都会给您想要的结果。例如：

I have an matrix as below:

          jerry    peter    king
 jerry     1       0        0    
 peter     0       1        0    
 king      1       1        1              

Now I am trying to draw a graph standing for the matrix with the code below:

t <- read.table("../data/table.dat");
adjm <- data.matrix(t);
g1 <- graph.adjacency(adjm,add.colnames=NULL);
plot(g1, main="social network", vertex.color="white", edge.color="grey", vertex.size=8,
     vertex.frame.color="yellow");

The labels of the vertices is the id, so my question is how do I set the label of the vertices by the dimnames of the matrix?

I have tried to the code

vertex.label=attr(adjm,"dimnames")

but get the wrong graph.

解决方案

There are 2 ways to do this:

1. When you create the graph object, assign the names to a vertex attribute called label. This is the default that plot.igraph() looks for when plotting.

   g1 <- graph.adjacency(adjm,add.colnames='label')
   

2. Use the V iterator to extract the name vertex attribute, which is how they are stored if you use add.colnames=NULL.

   plot(g1, main="social network", vertex.color="white", edge.color="grey", vertex.size=8, vertex.frame.color="yellow", vertex.label=V(g1)$name)
   

Either way will give you your desired result. Something like:

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