如何用定义的颜色绘制igraph社区？

Question

我可以使用下面的代码生成和绘制社区:

 wc <- walktrap.community(subgraph)
 modularity(wc)
 membership(wc)

 layout <-layout.fruchterman.reingold(subgraph)

 plot(wc, subgraph,  layout=layout, vertex.label=NA, vertex.size=5, edge.arrow.size=.2)

但是,社区的颜色是自动的,我有两个问题:

1. 我可以自定义社区颜色吗？
2. 我可以在社区中添加一些文字吗？

Answer 1

是的,你可以做这两件事.根据它们所在的模块更改节点的颜色(以及更改模块周围多边形的颜色)可以使用参数直接更改plot.igraph.向模块添加文本并不是那么简单,最简单的解决方案就是我知道手动将文本添加到图中.

library(igraph)

# Generate random graph and community structure
set.seed(23)
g <- sample_gnm(15, 45)
wc <- walktrap.community(g)

# Plot
par(mfrow=c(1,2), mar=rep(1,4))
layout <-layout.fruchterman.reingold(g)
plot(wc, g, layout=layout, vertex.label=NA, vertex.size=5,  edge.arrow.size=.2)

# Change colors of nodes, polygons, and polygon borders
new_cols <- c("white", "red", "black")[membership(wc)]
plot(wc, g, col=new_cols, mark.border="black", mark.col=c("tan", "pink", "lightgray"), 
    layout=layout, vertex.label=NA, vertex.size=5, edge.arrow.size=.2)

# Add labels
text(c(-1.15, 0.8, 0.9), c(0.35, -0.7, 0.8), c("A", "B", "C"))