Using a graph object of class
dgr_graph
, create a selection of nodes
that have certain degree values.
select_nodes_by_degree(graph, expressions, set_op = "union")
graph | a graph object of class
|
---|---|
expressions | one or more expressions for
filtering of nodes by degree values. Use a
combination of a degree type ( |
set_op | the set operation to perform upon
consecutive selections of graph nodes. This can
either be as a |
a graph object of class dgr_graph
.
# Create a random graph using the # `add_gnm_graph()` function graph <- create_graph() %>% add_gnm_graph( n = 35, m = 125, set_seed = 23) # Report which nodes have a total degree (in-degree # + out-degree) of exactly 9 graph %>% select_nodes_by_degree( expressions = "deg == 9") %>% get_selection()#> [1] 5 10 26 31# Report which nodes have a total degree greater # than or equal to 9 graph %>% select_nodes_by_degree( expressions = "deg >= 9") %>% get_selection()#> [1] 1 2 4 5 10 12 18 25 26 31# Combine two calls of `select_nodes_by_degree()` # to get those nodes with total degree less than # 3 and total degree greater than 10 (by default, # those `select...()` functions `union` the sets # of nodes selected) graph %>% select_nodes_by_degree( expressions = "deg < 3") %>% select_nodes_by_degree( expressions = "deg > 10") %>% get_selection()#> [1] 1 2# Combine two calls of `select_nodes_by_degree()` # to get those nodes with total degree greater than # or equal to 3 and less than or equal to 10 (the # key here is to `intersect` the sets of nodes # selected in the second call) graph %>% select_nodes_by_degree( expressions = "deg >= 3") %>% select_nodes_by_degree( expressions = "deg <= 10", set_op = "intersect") %>% get_selection()#> [1] 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 #> [26] 28 29 30 31 32 33 34 35# Select all nodes with an in-degree greater than 5, # then, apply a node attribute to those selected nodes # (coloring the selected nodes red) graph_2 <- graph %>% select_nodes_by_degree( expressions = "indeg > 5") %>% set_node_attrs_ws( node_attr = "color", value = "red") # Get the selection of nodes graph_2 %>% get_selection()#> [1] 1 4 13 25 35