nodes_from_el.RdThis function allows to extract the node names for an edgelist. When the parameter select_cols is absent, existing source and target columns are used. If no columns named source or target are present, and the parameter is not specified, the first and second column are assumed to be source and target.
nodes_from_el(edge.list, select_cols = NULL)
| edge.list | edgelist, either in matrix or dataframe/tibble format |
|---|---|
| select_cols | optional vector specifying source and target columns of the edgelist. When absent, existing source and target columns are used. If no columns named source or target are present, and the parameter is not specified, the first and second column are assumed to be source and target. If `select_cols` is a numeric vector, its first two elements are assumed to be the source and target columns indices. If `select_cols` is a character vector, its first two elements are assumed to be the names of the source and target columns. |
vector containing unique node names
el <- data.frame(from= c('a','b','b','c','d','d'), to = c('b','c','d','a','b','a'), attr= c( 12, 6, 12 , 6 , 6 , 6 )) nodes_from_el(el, select_cols = c('from','to'))#> [1] "a" "b" "c" "d"nodes_from_el(el, select_cols = 1:2)#> [1] "a" "b" "c" "d"nodes_from_el(el)#> [1] "a" "b" "c" "d"