我有一个问题，图中边的顺序是否重要？

似乎中介函数对输入文件的不同顺序产生略有不同的结果。

输入文件： http: //preview.tinyurl.com/p9vlxnc

#1st run, with unordered edges
edges <- read.csv("example.csv", col.names=c("src", "dest"), colClasses = "character")

social.graph <- graph.edgelist(as.matrix(edges), directed=T)
social.graph <- graph.adjacency(get.adjacency(social.graph), weighted=TRUE)

E(social.graph)$weight <- 1 / E(social.graph)$weight

set.seed(1)
between1 <- betweenness(social.graph)

#2nd run, with now ordered edges
edges <- edges[order(edges[,1], edges[,2]),]

social.graph <- graph.edgelist(as.matrix(edges), directed=T)
social.graph <- graph.adjacency(get.adjacency(social.graph), weighted=TRUE)

E(social.graph)$weight <- 1 / E(social.graph)$weight
set.seed(1)

between2 <- betweenness(social.graph)

print(merge(data.frame(between1=between1, names=names(between1)),
            data.frame(between2=between2, names=names(between2))))

两个节点 1341 和 1352 的结果略有不同

   names   between1   between2
1   1284  0.5833333  0.5833333
2   1304  0.0000000  0.0000000
3   1320 21.7500000 21.7500000
4   1336  1.7500000  1.7500000
5   1341 15.0833333 14.0833333
6   1345  2.0000000  2.0000000
7   1350  0.7500000  0.7500000
8   1352 74.2500000 75.2500000
9   1356  0.0000000  0.0000000
10  1358  0.0000000  0.0000000
11  1387  1.8333333  1.8333333
12  1398 16.0000000 16.0000000
13  1405  0.5833333  0.5833333
14  1439  1.0000000  1.0000000
15  1960 34.0000000 34.0000000
16  3918  0.0000000  0.0000000

这很奇怪，因为邻接矩阵是相同的（只有列/行的顺序不同）。这是一个错误还是中间性确实取决于边缘的顺序？