View source: R/get_predecessors.R
get_predecessors | R Documentation |
Provides a vector of node IDs for all nodes that have a connection to the given node.
get_predecessors(graph, node)
graph |
A graph object of class |
node |
A node ID for the selected node. |
A vector of node ID values.
# Set a seed
suppressWarnings(RNGversion("3.5.0"))
set.seed(23)
# Create a node data frame (ndf)
ndf <- create_node_df(n = 26)
# Create an edge data
# frame (edf)
edf <-
create_edge_df(
from = sample(
1:26, replace = TRUE),
to = sample(
1:26, replace = TRUE))
# From the ndf and edf,
# create a graph object
graph <-
create_graph(
nodes_df = ndf,
edges_df = edf)
# Get predecessors for node
# `23` in the graph
graph %>%
get_predecessors(
node = 23)
# If there are no predecessors,
# `NA` is returned
graph %>%
get_predecessors(
node = 26)
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