context("graph.subisomorphic, lad")
test_that("graph.subisomorphic, method = 'lad' works", {
library(igraph)
pattern <- graph_from_literal(1:2:3:4:5,
1 - 2:5, 2 - 1:5:3, 3 - 2:4, 4 - 3:5, 5 - 4:2:1)
target <- graph_from_literal(1:2:3:4:5:6:7:8:9,
1 - 2:5:7, 2 - 1:5:3, 3 - 2:4, 4 - 3:5:6:8:9,
5 - 1:2:4:6:7, 6 - 7:5:4:9, 7 - 1:5:6,
8 - 4:9, 9 - 6:4:8)
domains <- list(`1` = c(1,3,9), `2` = c(5,6,7,8), `3` = c(2,4,6,7,8,9),
`4` = c(1,3,9), `5` = c(2,4,8,9))
i1 <- subgraph_isomorphic(pattern, target, method = "lad")
i2 <- subgraph_isomorphic(pattern, target, induced=TRUE, method = "lad")
i3 <- subgraph_isomorphic(pattern, target, domains=domains,
method = "lad")
expect_true(i1)
expect_true(i2)
expect_true(i3)
})
test_that("LAD stress test", {
library(igraph)
local_rng_version("3.5.0")
set.seed(42)
N <- 100
for (i in 1:N) {
target <- sample_gnp(20, .5)
pn <- sample(4:18, 1)
pattern <- induced_subgraph(target, sample(vcount(target), pn))
iso <- subgraph_isomorphic(pattern, target, induced=TRUE,
method = "lad")
expect_true(iso)
}
set.seed(42)
for (i in 1:N) {
target <- sample_gnp(20, 1/20)
pn <- sample(5:18, 1)
pattern <- sample_gnp(pn, .6)
iso <- subgraph_isomorphic(pattern, target, induced=TRUE,
method = "lad")
expect_false(iso)
}
})
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