View source: R/add_reverse_edges_ws.R

add_reverse_edges_ws | R Documentation |

Add edges in the opposite direction of one or more edges available as an edge
selection in a graph object of class `dgr_graph`

. New graph edges have the
opposite edge definitions as those in the selection. For example, a graph
with the edge `1->2`

in its active selection will gain a new `2->1`

edge.
There is also the option to assign a common `rel`

grouping to the newly
created edges. Upon addition of the edges, the edge selection will be
retained for further selection or traversal operations.

add_reverse_edges_ws(graph, rel = NULL, edge_aes = NULL, edge_data = NULL)

`graph` |
A graph object of class |

`rel` |
An optional string to apply a |

`edge_aes` |
An optional list of named vectors comprising edge aesthetic
attributes. The helper function |

`edge_data` |
An optional list of named vectors comprising edge data
attributes. The helper function |

This function makes use of an active selection of edges (and the function
ending with `_ws`

hints at this).

Selections of edges can be performed using the following selection
(`select_*()`

) functions: `select_edges()`

, `select_last_edges_created()`

,
`select_edges_by_edge_id()`

, or `select_edges_by_node_id()`

.

Selections of edges can also be performed using the following traversal
(`trav_*()`

) functions: `trav_out_edge()`

, `trav_in_edge()`

,
`trav_both_edge()`

, or `trav_reverse_edge()`

.

A graph object of class `dgr_graph`

.

Other Edge creation and removal:
`add_edge_clone()`

,
`add_edge_df()`

,
`add_edges_from_table()`

,
`add_edges_w_string()`

,
`add_edge()`

,
`add_forward_edges_ws()`

,
`copy_edge_attrs()`

,
`create_edge_df()`

,
`delete_edges_ws()`

,
`delete_edge()`

,
`delete_loop_edges_ws()`

,
`drop_edge_attrs()`

,
`edge_data()`

,
`join_edge_attrs()`

,
`mutate_edge_attrs_ws()`

,
`mutate_edge_attrs()`

,
`recode_edge_attrs()`

,
`rename_edge_attrs()`

,
`rescale_edge_attrs()`

,
`rev_edge_dir_ws()`

,
`rev_edge_dir()`

,
`set_edge_attr_to_display()`

,
`set_edge_attrs_ws()`

,
`set_edge_attrs()`

# Create an empty graph, add 2 nodes to it, # and create the edge `1->2` graph <- create_graph() %>% add_n_nodes( n = 2, type = "type_a", label = c("a_1", "a_2")) %>% add_edge( from = 1, to = 2, rel = "a") # Get the graph's edges graph %>% get_edge_ids() # Select the edge and create 2 additional edges # with the opposite definition of `1->2`, which # is `2->1`; also, apply, different `rel` values # (`b` and `c`) graph <- graph %>% select_edges() %>% add_reverse_edges_ws(rel = "b") %>% add_reverse_edges_ws(rel = "c") %>% clear_selection() # Get the graph's edge data frame graph %>% get_edge_df()

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