context("edge names")
test_that("edge names work", {
library(igraph)
## named edges
igraph_options(print.edge.attributes = TRUE)
g <- make_ring(10)
E(g)$name <- letters[1:ecount(g)]
g2 <- delete_edges(g, c("b", "d", "e"))
expect_that(as_edgelist(g2),
equals(structure(c(1, 3, 6, 7, 8, 9, 1, 2, 4, 7, 8, 9,
10, 10), .Dim = c(7L, 2L))))
## named vertices
g <- make_ring(10)
V(g)$name <- letters[1:vcount(g)]
g3 <- delete_edges(g, c("a|b", "f|g", "c|b"))
expect_that(as_edgelist(g3),
equals(structure(c("c", "d", "e", "g", "h", "i", "a",
"d", "e", "f", "h", "i", "j", "j"),
.Dim = c(7L, 2L))))
## no names at all, but select edges based on vertices
g <- make_ring(10)
g4 <- delete_edges(g, c("1|2", "8|7", "1|10"))
expect_that(as_edgelist(g4),
equals(structure(c(2, 3, 4, 5, 6, 8, 9, 3, 4, 5, 6, 7,
9, 10), .Dim = c(7L, 2L))))
## mix edge names and vertex names
g <- make_ring(10)
V(g)$name <- letters[1:vcount(g)]
E(g)$name <- LETTERS[1:ecount(g)]
g5 <- delete_edges(g, c("a|b", "F", "j|i"))
expect_that(as_edgelist(g5),
equals(structure(c("b", "c", "d", "e", "g", "h", "a",
"c", "d", "e", "f", "h", "i", "j"),
.Dim = c(7L, 2L))))
})
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