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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")
A graph object of class dgr_graph
.
A graph object of class dgr_graph
.
One or more expressions for filtering nodes by degree
values. Use a combination of degree type (deg
for total degree, indeg
for in-degree, and outdeg
for out-degree) with a comparison operator and
values for comparison (e.g., use "deg >= 2"
to select nodes with a degree
greater than or equal to 2).
The set operation to perform upon consecutive selections of
graph nodes. This can either be as a union
(the default), as an
intersection of selections with intersect
, or, as a difference
on the
previous selection, if it exists.
# 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()
# Report which nodes have a
# total degree greater than or
# equal to 9
graph %>%
select_nodes_by_degree(
expressions = "deg >= 9") %>%
get_selection()
# 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 will `union` the
# sets of nodes selected)
graph %>%
select_nodes_by_degree(
expressions = "deg < 3") %>%
select_nodes_by_degree(
expressions = "deg > 10") %>%
get_selection()
# 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()
# 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()
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