context("degree")
test_that("degree works", {
library(igraph)
g <- sample_gnp(100, 1/100)
d <- degree(g)
el <- as_edgelist(g)
expect_that(as.numeric(table(el)), equals(d[d!=0]))
expect_that(degree(g) / (vcount(g)-1), equals(degree(g, normalized=TRUE)))
g2 <- sample_gnp(100, 2/100, directed=TRUE)
din <- degree(g2, mode="in")
dout <- degree(g2, mode="out")
el2 <- as_edgelist(g2)
expect_that(as.numeric(table(el2[,1])), equals(dout[dout!=0]))
expect_that(as.numeric(table(el2[,2])), equals(din[din!=0]))
expect_that(degree(g2, mode="in") / (vcount(g2)-1),
equals(degree(g2, mode="in", normalized=TRUE)))
expect_that(degree(g2, mode="out") / (vcount(g2)-1),
equals(degree(g2, mode="out", normalized=TRUE)))
expect_that(degree(g2, mode="all") / (vcount(g2)-1),
equals(degree(g2, mode="all", normalized=TRUE)))
})
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