igraph R | 如何为每个节点添加第二个内部圆圈？

Question

我想在当前的顶点上添加第二个内部圆。它应该与某个变量成比例。

这里是一个例子： 我已经知道如何为主圆即顶点大小做到这一点。

variable1 <- c(20,40,60) # this will define the size of the vertices
g1 <- graph(edges=c(1,2, 2,3, 3,1), n=3, directed=F)
V(g1)$size <- variable1 # this assigns the vertices size to the igraph object 'g1'
plot(g1)
variable2 <- c(10,20,30) # this would be needed for a second, internal circle, ideally in a different color

任何想法？

- fibar

Answer 1

您可以尝试

library(igraph)
variable1 <- c(20,40,60) # this will define the size of the vertices
variable2 <- c(10,20,30) # this would be needed for a second, internal circle, ideally in a different color
g1 <- graph(edges=c(1,2, 2,3, 3,1), n=3, directed=F)
V(g1)$size <- variable1 # this assigns the vertices size to the igraph object 'g1'
coords <- layout.auto(g1)
plot(g1, layout=coords, vertex.frame.color="orange", vertex.color=NA, vertex.label = NA)
plot(g1, layout=coords, vertex.size=variable2, add=T, vertex.color="lightgray")

- lukeA

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不错的技巧。是否可以使边缘从外部环开始？ - fibar

@fibar 是的，只需在第二个中添加 edge.lty="blank" 即可。目前它会重叠第二组边缘。 - lukeA