mutate_edge_attrs {DiagrammeR} | R Documentation |
Within a graph's internal edge data frame (edf), mutate numeric edge attribute values using one or more expressions.
mutate_edge_attrs(graph, ...)
graph |
a graph object of class
|
... |
expressions used for the mutation of edge attributes. LHS of each expression is either an existing or new edge attribute name. The RHS can consist of any valid R code that uses edge attributes as variables. Expressions are evaluated in the order provided, so, edge attributes created or modified are ready to use in subsequent expressions. |
a graph object of class
dgr_graph
.
# Create a graph with 3 edges graph <- create_graph() %>% add_path(n = 4) %>% set_edge_attrs( edge_attr = width, values = c(3.4, 2.3, 7.2)) # Get the graph's internal edf # to show which edge attributes # are available graph %>% get_edge_df() # Mutate the `width` edge # attribute, dividing each # value by 2 graph <- graph %>% mutate_edge_attrs( width = width / 2) # Get the graph's internal # edf to show that the edge # attribute `width` had its # values changed graph %>% get_edge_df() # Create a new edge attribute, # called `length`, that is the # log of values in `width` plus # 2 (and, also, round all values # to 2 decimal places) graph <- graph %>% mutate_edge_attrs( length = (log(width) + 2) %>% round(2)) # Get the graph's internal edf # to show that the edge attribute # values had been mutated graph %>% get_edge_df() # Create a new edge attribute # called `area`, which is the # product of the `width` and # `length` attributes graph <- graph %>% mutate_edge_attrs( area = width * length) # Get the graph's internal edf # to show that the edge attribute # values had been multiplied # together (with new attr `area`) graph %>% get_edge_df()