From a graph object of class
dgr_graph, get edge attribute properties for
edges available in a selection and cache those
values in the graph for later retrieval using
get_cache.
Selections of edges can be performed using
the following select_... functions:
select_edges(),
select_last_edge(), or
select_edges_by_node_id().
Selections of edges can also be performed using
the following traversal functions:
trav_out_edge(), trav_in_edge(),
or trav_both_edge().
cache_edge_attrs_ws(graph, edge_attr, name = NULL, mode = NULL)a graph object of class
dgr_graph.
the edge attribute from which to obtain values.
an optional name for the cached vector.
a option to recast the returned vector
of edge attribute value as numeric or
character.
a graph object of class dgr_graph.
# Set a seed
set.seed(23)
# Create a graph with 6 nodes and 5 edges graph <- create_graph() add_path(n = 6) set_edge_attrs( edge_attr = value, values = rnorm(edge_count(.), 5, 2))
# Select all edges where the edge attribute # `value` is less than 5 graph <- graph select_edges( conditions = value < 5.0)
# Show the graph's edge data frame graph get_edge_df() #> id from to rel value #> 1 1 1 2 <NA> 5.090874 #> 2 2 2 3 <NA> 8.151559 #> 3 3 3 4 <NA> 5.436577 #> 4 4 4 5 <NA> 2.906929 #> 5 5 5 6 <NA> 4.422623
# Cache available values from the edge # attribute `value` from the edges that # are selected; ensure that the cached # vector is numeric graph <- graph cache_edge_attrs_ws( edge_attr = value, name = "edge_value")
# Get the cached vector with `get_cache()` graph get_cache(name = "edge_value") #> [1] 2.906929 4.422623