context("edge_betweenness")
test_that("edge_betweenness works", {
library(igraph)
kite <- graph_from_literal(Andre - Beverly:Carol:Diane:Fernando,
Beverly - Andre:Diane:Ed:Garth,
Carol - Andre:Diane:Fernando,
Diane - Andre:Beverly:Carol:Ed:Fernando:Garth,
Ed - Beverly:Diane:Garth,
Fernando - Andre:Carol:Diane:Garth:Heather,
Garth - Beverly:Diane:Ed:Fernando:Heather,
Heather - Fernando:Garth:Ike,
Ike - Heather:Jane,
Jane - Ike)
bet <- betweenness(kite)
ebet <- edge_betweenness(kite)
bet2 <- sapply(1:vcount(kite), function(x) {
ae <- E(kite)[ .inc(x) ]
(sum(ebet[ae])-vcount(kite)+1) / 2
})
expect_that(unname(bet), equals(bet2))
#### Weighted
E(kite)$weight <- sample(1:10, ecount(kite), replace=TRUE)
bet <- betweenness(kite)
ebet <- edge_betweenness(kite)
bet2 <- sapply(1:vcount(kite), function(x) {
ae <- E(kite)[ .inc(x) ]
(sum(ebet[ae])-vcount(kite)+1) / 2
})
expect_that(unname(bet), equals(bet2))
})
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