r - Rstudio 使用 igraph 的网络错误消息

Question

我正在尝试用这些数据点建立一个网络。我将它们组织起来，以便资源到达正确的目标。但是，我运行时遇到错误，

library(igraph)


links <- data.frame(
  source=c("P","P","P","P","G","G","T","T","N","N","B","B","S","S","O","D"),
  target=c("G","B","S","D","T","D","N","D","R","D","R","D","B","E","E","E"),
  importance=(sample(1:4, 16, replace=T))
  )

nodes <- data.frame(
  name=LETTERS[1:10],
  carac=c( rep("bio",2),rep("affective",3),rep("cog",3),rep("neg",2))
  )


network <- graph_from_data_frame(d=links, vertices=nodes, directed=F) 

我遇到的错误发生在最后一行。它说

graph_from_data_frame(d = links, vertices = Nodes, dependent = F) 中的错误:边列表中的某些顶点名称未在顶点数据框中列出

我不明白我的顶点数据框出了什么问题。我也不知道它所指的“边缘列表”是什么。任何帮助调试将不胜感激!

这是来自 r-graph-gallery 的基本代码，我将数据插入其中。它应该创建一个具有链接和节点的网络。我不明白替换或重要性指的是什么，网站上也没有解释。这就是基础数据的样子。

    library(igraph)
 
links <- data.frame(
    source=c("A","A", "A", "A", "A","J", "B", "B", "C", "C", "D","I"),
    target=c("B","B", "C", "D", "J","A","E", "F", "G", "H", "I","I"),
    importance=(sample(1:4, 12, replace=T))
    )
nodes <- data.frame(
    name=LETTERS[1:10],
    carac=c( rep("young",3),rep("adult",2), rep("old",5))
    )
 
network <- graph_from_data_frame(d=links, vertices=nodes, directed=F)

Answer 1

library(igraph)

 
links <- data.frame(  
 
source=c("P","P","P","P","G","G","T","T",
"N","N","B","B","S","S","O","D"),
 
target=c("G","B","S","D","T","D","N","D",
"R","D","R","D","B","E","E","E"),
 importance=(sample(1:4, 16, replace=T)) ) 

V = c(links$source,
 links$target) %>% 
unique() 

nodes <- data.frame(   name=V,   
carac=c(
 rep("bio",2),rep("affective",3),rep("cog",3),rep("neg",2)) )
 
 
network <- graph_from_data_frame(d=links, vertices=nodes, directed=F) 
 
plot(network)

您需要确保所有节点 ID 都存在于节点数据框中。它们应该是链接df中存在的所有节点。