如何从R中的图中随机选择2个顶点？

我是R新手，我尝试从图中随机选择两个顶点

到目前为止，我所做的是： 首先，建立一个图表

edgePath <- "./project1/data/smalledges.csv"

edgesMatrix <- as.matrix(read.csv(edgePath, header = TRUE, colClasses = "character"))
graph <- graph.edgelist(edgesMatrix)

然后，我将图形中的所有顶点放入一个列表：

vList <- as.list(get.data.frame(graph, what = c("vertices")))

但我得到的是一个错误：

cannot take a sample larger than the population when 'replace = FALSE'

我想这是因为R认为我想要的是两个随机列表，所以我尝试了以下方法：

sample(vList, 2, replace = TRUE)

---

然后我有两个大的列表。。。但那不是我想要的！伙计们，我怎么能从我的图中随机选择两个顶点呢？谢谢

您的问题不清楚您想要的是顶点，还是包含这些顶点的子图。这里有两个例子

library(igraph)
set.seed(1)    # for reproducible example
g <- erdos.renyi.game(10, 0.3)

par(mfrow=c(1,3), mar=c(1,1,1,1))
set.seed(1)    # for reproducible plot
plot(g)
# random sample of vertices
smpl <- sample(1:vcount(g),5)    
V(g)[smpl]                      # 5 random vertices
# Vertex sequence:
# [1] 9 5 7 2 4

# change the color of only those vertices
V(g)[smpl]$color="lightgreen"   # make them light green
set.seed(1)    # for reproducible plot
plot(g)
# create a sub-graph with only those vertices, retaining edge structure
sub.g <- induced.subgraph(g,V(g)[smpl])
plot(sub.g)

---

只是一个猜测-samplevList[[1]]，2。更直接地说，sampleVgraph$name，2，replace=FALSE，其中replace=FALSE确保将选择两个不同的顶点。谢谢！这正是我需要的！如何确保顶点的名称是正确的？

sample(vList, 2, replace = TRUE)

library(igraph)
set.seed(1)    # for reproducible example
g <- erdos.renyi.game(10, 0.3)

par(mfrow=c(1,3), mar=c(1,1,1,1))
set.seed(1)    # for reproducible plot
plot(g)
# random sample of vertices
smpl <- sample(1:vcount(g),5)    
V(g)[smpl]                      # 5 random vertices
# Vertex sequence:
# [1] 9 5 7 2 4

# change the color of only those vertices
V(g)[smpl]$color="lightgreen"   # make them light green
set.seed(1)    # for reproducible plot
plot(g)
# create a sub-graph with only those vertices, retaining edge structure
sub.g <- induced.subgraph(g,V(g)[smpl])
plot(sub.g)