Get edge attribute values from a selection of edges
From a graph object of class dgr_graph, get edge attribute values for one
or more edges.
get_edge_attrs_ws(graph, edge_attr)
graph |
A graph object of class |
edge_attr |
the name of the attribute for which to get values. |
This function makes use of an active selection of edges (and the function
ending with _ws hints at this).
Selections of edges can be performed using the following selection
(select_*()) functions: select_edges(), select_last_edges_created(),
select_edges_by_edge_id(), or select_edges_by_node_id().
Selections of edges can also be performed using the following traversal
(trav_*()) functions: trav_out_edge(), trav_in_edge(),
trav_both_edge(), or trav_reverse_edge().
A named vector of edge attribute values for the attribute given by
edge_attr by edge.
# Create a simple graph where
# edges have an edge attribute
# named `value`
graph <-
create_graph() %>%
add_n_nodes(n = 4) %>%
{
edges <-
create_edge_df(
from = c(1, 2, 1, 4),
to = c(2, 3, 4, 3),
rel = "rel")
add_edge_df(
graph = .,
edge_df = edges)
} %>%
set_edge_attrs(
edge_attr = value,
values = 1.6,
from = 1,
to = 2) %>%
set_edge_attrs(
edge_attr = value,
values = 4.3,
from = 1,
to = 4) %>%
set_edge_attrs(
edge_attr = value,
values = 2.9,
from = 2,
to = 3) %>%
set_edge_attrs(
edge_attr = value,
values = 8.4,
from = 4,
to = 3)
# Select the edges defined as
# `1`->`3` and `2`->`3`
graph <-
graph %>%
select_edges(
from = c(1, 2),
to = c(2, 3))
# Get the edge attribute values
# for the `value` attribute, limited
# to the current edge selection
graph %>%
get_edge_attrs_ws(
edge_attr = value)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.