join_node_attrs {DiagrammeR} | R Documentation |
Join new node attribute values in a left join using a data frame. The use of a left join in this function allows for no possibility that nodes in the graph might be removed after the join.
join_node_attrs(graph, df, by_graph = NULL, by_df = NULL)
graph |
a graph object of class |
df |
the data frame to use for joining. |
by_graph |
optional specification of the column
in the graph's internal node data frame for the left
join. If both |
by_df |
optional specification of the column in
|
a graph object of class
dgr_graph
.
library(magrittr) # Create a simple graph graph <- create_graph() %>% add_n_nodes(5) %>% add_edges_w_string("1->2 1->3 2->4 2->5 3->5") # Create a data frame with node ID values and a # set of numeric values df <- data.frame(nodes = 1:6, values = rnorm(6, 5)) # Join the values in the data frame to the # graph's nodes; this works as a left join using # identically-named columns in the graph and the df # (in this case `nodes` is common to both) graph <- graph %>% join_node_attrs(df) # Get the graph's internal ndf to show that the # join has been made get_node_df(graph) #> nodes type label values #> 1 1 4.27988818205506 #> 2 2 5.3499594040959 #> 3 3 5.43965531750004 #> 4 4 3.50233363164518 #> 5 5 5.04599475422798