将数据帧转换为igraph错误:重复的顶点名称

Question

我知道可以直接从数据框创建一个igraph图.我试图这样做,但到目前为止失败了.

我有一个带有以下模式的DF"myvertices"(id和name是唯一的):

id, name, feature_a, feature_b, feature_c

还有另一个带有以下架构的DF"myedges":

id, from, to, feature_d, feature_e, feature_f

其中"from"和"to"包含"myvertices"中的"id".

基于这些,我尝试了以下内容:

g <- graph.data.frame(myedges, directed=TRUE, vertices=myvertices)

但结果如下:

graph.data.frame中的错误(myedges,directed = T,vertices = myvertices):重复的顶点名称.

Answer 1

我猜错误消息提供了一个很好的提示 - 似乎你在顶点id之间有重复.例如:

library(igraph)

myvertices <- read.csv(stringsAsFactors=F, text="
id,name,feature_a,feature_b,feature_c
a,foo,1,2,3
b,bar,1,2,3
c,extra,1,2,3")

myedges <- read.csv(stringsAsFactors=F, text="
id,from,to,feature_d,feature_e,feature_f
1,a,b,1,2,3")

graph.data.frame(myedges[, -1], directed=TRUE, vertices=myvertices)
# IGRAPH DN-- 3 1 -- 
# + attr: name (v/c), feature_a (v/n), feature_b (v/n), feature_c (v/n), feature_d (e/n), feature_e (e/n), feature_f (e/n)
# + edge (vertex names):
# [1] foo->bar

myvertices$id[3] <- "a" # duplicate a
graph.data.frame(myedges[, -1], directed=TRUE, vertices=myvertices)
# Error in graph.data.frame(myedges[, -1], directed = TRUE, vertices = myvertices) : 
#   Duplicate vertex names