我正在使用 igraph 包，我不确定它是否是一个错误，但 $father 输出有时没有意义。具体来说，当我重命名顶点属性时。
h<-make_tree(10)
#with normal vertex attributes
graph.bfs(h, root="1", neimode='out', order=TRUE, father=TRUE,unreachable=FALSE) #father output seems correct
plot(h,layout=layout_as_tree)
#with renamed vertex attributes
set.seed(1)
h<-set.vertex.attribute(h, "name", value=sample(1:10,10))
plot(h,layout=layout_as_tree)
graph.bfs(h, root="3", neimode='out', order=TRUE, father=TRUE,unreachable=FALSE) #father output seems wrong
我获得如下输出
#with normal vertex attributes
$order
+ 10/10 vertices, from ff55a96:
[1] 1 2 3 4 5 6 7 8 9 10
$rank
NULL
$father
+ 10/10 vertices, from ff55a96:
[1] NA 1 1 2 2 3 3 4 4 5
#with …