Nothing
create_diamond_dag <- function() {
d <- dag_new()
dag_add_node(d)
dag_add_node(d)
dag_add_node(d)
dag_add_node(d)
dag_add_edge(d, 0, 1)
dag_add_edge(d, 0, 2)
dag_add_edge(d, 1, 3)
dag_add_edge(d, 2, 3)
# 0
# / \
# 1 2
# \ /
# 3
d
}
create_snake_dag <- function() {
d <- dag_new()
dag_add_node(d)
dag_add_node(d)
dag_add_node(d)
expect_equal(dag_add_node_at(d, 1), 3)
dag_add_edge(d, 0, 3)
dag_add_edge(d, 3, 1)
dag_add_edge(d, 1, 2)
# 0 - 3 - 1 - 2
dag_add_edge(d, 0, 1)
dag_add_edge(d, 3, 2)
# /------\
# 0 - 3 - 1 - 2
# \-----/
dag_tidy_up(d)
d
}
create_bin_tree_dag <- function() {
d <- dag_new()
dag_add_node(d)
dag_add_node(d)
dag_add_node(d)
dag_add_node(d)
expect_equal(dag_add_node_at(d, 2), 4)
dag_add_node(d)
dag_add_node(d)
# 0 1 4 2 3 5 6
dag_add_edge(d, 0, 1)
dag_add_edge(d, 0, 4)
dag_add_edge(d, 1, 2)
dag_add_edge(d, 1, 3)
dag_add_edge(d, 4, 5)
dag_add_edge(d, 4, 6)
# 0
# / \
# 1 4
# / \ / \
# 2 3 5 6
dag_tidy_up(d)
d
}
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