ggraph学习

graph_from_data_frame(d, directed=TRUE, vertices=NULL)

• directed: whether or not to create a directed graph;

  
  转化之后的结果

mygraph <- graph_from_data_frame(connect, vertices = coauth, directed = FALSE ) 
mygraph <- graph_from_data_frame(connect, vertices = coauth, directed = TRUE )

数据查看
数据真实情况

所以，directed=TRUE就是只记录from➡️to的数据（directed）；

• d中from和to两列symbolic edge list都会出现在vertices中；

  
  coauth数据构成

vertices定义 d和vertices的关系

# Create a graph object with igraph
mygraph <- graph_from_data_frame( connect, vertices = coauth, directed = FALSE )

# Find community
com <- walktrap.community(mygraph)
print(com)
plot(
  com,
  mygraph,
  col = membership(com),
  mark.groups = communities(com),
  edge.color = c("black", "red")[crossing(com, mygraph) + 1]
)

print(com)结果，分成九组
Find community的方法

• 1. data in string

     
     data in string

• 2. data in cluster_walktrap

     
     data in cluster_walktrap