Provides a vector of node IDs for all nodes that have a connection to the given node.

get_predecessors(graph, node)

Arguments

graph

a graph object of class dgr_graph.

node

a node ID for the selected node.

Value

a vector of node ID values.

Examples

# Set a seed 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)
#> [1] 6
# If there are no predecessors, # `NA` is returned graph %>% get_predecessors( node = 26)
#> [1] NA