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context("as.directed")
test_that("as.directed works", {
library(igraph)
g <- sample_gnp(100, 2/100)
g2 <- as.directed(g, mode="mutual")
g3 <- as.directed(g, mode="arbitrary")
expect_that(degree(g), equals(degree(g3)))
expect_that(degree(g), equals(degree(g2) / 2))
expect_that(graph.isomorphic(g, as.undirected(g2)), is_true())
expect_that(graph.isomorphic(g, as.undirected(g3)), is_true())
})
test_that("as.directed keeps attributes", {
library(igraph)
g <- graph_from_literal( A-B-C, D-A, E )
g$name <- "Small graph"
g2 <- as.directed(g, mode="mutual")
g3 <- as.directed(g, mode="arbitrary")
expect_that(g2$name, equals(g$name))
expect_that(V(g2)$name, equals(V(g)$name))
expect_that(g3$name, equals(g$name))
expect_that(V(g3)$name, equals(V(g)$name))
E(g)$weight <- seq_len(ecount(g))
g4 <- as.directed(g, "mutual") ; df4 <- as_data_frame(g4)
g5 <- as.directed(g, "arbitrary") ; df5 <- as_data_frame(g5)
expect_that(df4[order(df4[,1], df4[,2]),]$weight, equals(c(1,2,1,3,3,2)))
expect_that(df5[order(df5[,1], df5[,2]),]$weight, equals(1:3))
})
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