Nothing

```
context("indirect relations")
library(igraph)
library(magrittr)
library(Matrix)
test_that("adjacency is correct", {
g <- graph.empty(n = 11, directed = FALSE)
g <- add_edges(g, c(
1, 11, 2, 4, 3, 5, 3, 11, 4, 8, 5, 9, 5, 11, 6, 7, 6, 8,
6, 10, 6, 11, 7, 9, 7, 10, 7, 11, 8, 9, 8, 10, 9, 10
))
A <- indirect_relations(g, type = "adjacency")
expect_equal(A, get.adjacency(g, sparse = FALSE))
})
test_that("shortest path distances are correct", {
g <- graph.empty(n = 11, directed = FALSE)
g <- add_edges(g, c(
1, 11, 2, 4, 3, 5, 3, 11, 4, 8, 5, 9, 5, 11, 6, 7, 6, 8,
6, 10, 6, 11, 7, 9, 7, 10, 7, 11, 8, 9, 8, 10, 9, 10
))
D_igraph <- distances(g)
D_igraph_inv <- D_igraph^(-1)
diag(D_igraph_inv) <- 0
D_igraph_dpow <- D_igraph^-0.5
diag(D_igraph_dpow) <- 0
D <- indirect_relations(g, type = "dist_sp")
D_inv <- indirect_relations(g, type = "dist_sp", FUN = dist_inv)
D_2pow <- indirect_relations(g, type = "dist_sp", FUN = dist_2pow)
D_dpow <- indirect_relations(g, type = "dist_sp", FUN = dist_dpow, alpha = 0.5)
expect_equal(D_igraph, D)
expect_equal(D_igraph_inv, D_inv)
expect_equal(2^-D_igraph, D_2pow)
expect_equal(round(D_igraph_dpow, 7), round(D_dpow, 7))
})
test_that("walk counts are correct", {
g <- graph.empty(n = 11, directed = FALSE)
g <- add_edges(g, c(
1, 11, 2, 4, 3, 5, 3, 11, 4, 8, 5, 9, 5, 11, 6, 7, 6, 8,
6, 10, 6, 11, 7, 9, 7, 10, 7, 11, 8, 9, 8, 10, 9, 10
))
spec_decomp <- eigen(get.adjacency(g, sparse = F))
W_spec <- spec_decomp$vectors %*% diag(exp(spec_decomp$values)) %*%
t(spec_decomp$vectors)
W_exp <- indirect_relations(g, type = "walks", FUN = walks_exp)
expect_equal(round(W_spec, 7), round(W_exp, 7))
})
test_that("walk distances are correct", {
g <- graph.star(4, mode = "undirected")
expect_equal(indirect_relations(g, type = "dist_walk", dwparam = 1e-08), distances(g),
tolerance = 1e-04
)
expect_error(indirect_relations(g, type = "dist_walk"))
})
test_that("resistance distance is correct", {
g <- graph.star(5, mode = "undirected")
R <- indirect_relations(g, type = "dist_resist")
D <- distances(g)
expect_equal(R, D)
})
test_that("log forest distance is correct", {
g <- graph.full(5)
expect_equal(indirect_relations(g, type = "dist_lf", lfparam = 1e-10), distances(g),
tolerance = 1e-03
)
expect_error(indirect_relations(g, type = "dist_lf"))
})
test_that("random walk distance is correct", {
g <- graph.full(5)
D <- indirect_relations(g, type = "dist_rwalk")
exact <- matrix(4, 5, 5) - diag(4, 5)
expect_equal(D, exact)
})
test_that("rspx is correct", {
g <- graph.star(5, "undirected")
R <- round(indirect_relations(g, type = "depend_rsps", rspxparam = 50), 8)
expect_equal(rowSums(R), c(12, 0, 0, 0, 0))
set.seed(127)
g <- sample_gnp(30, 0.4)
test_cor <- cor(
rowSums(indirect_relations(g, type = "depend_rspn", rspxparam = 0.001)),
rowSums(indirect_relations(g, type = "depend_curflow"))
)
expect_equal(test_cor, 1)
})
test_that("walk transform is correct", {
g <- graph.full(5, directed = FALSE)
A <- indirect_relations(g, type = "walks", FUN = walks_uptok, alpha = 1, k = 2)
expect_equal(A, matrix(4, 5, 5))
katz <- rowSums(indirect_relations(g, type = "walks", FUN = walks_attenuated, alpha = 0.1))
expect_equal(katz, rep(5 / 3, 5))
even_and_odd <- indirect_relations(g, type = "walks", FUN = walks_exp_even) +
indirect_relations(g, type = "walks", FUN = walks_exp_odd)
all <- indirect_relations(g, type = "walks", FUN = walks_exp)
expect_equal(even_and_odd, all)
})
```

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