select_nodes_by_id {DiagrammeR} | R Documentation

## Select nodes in a graph by ID values

### Description

Select nodes in a graph object of class `dgr_graph` by their node ID values. If nodes have IDs that are monotonically increasing integer values, then numeric ranges can be used for the selection.

### Usage

    select_nodes_by_id(graph, nodes, set_op = "union")

### Arguments

`graph` | a graph object of class `dgr_graph`.
`nodes` | a vector of node IDs for the selection of nodes present in the graph.
`set_op` | the set operation to perform upon consecutive selections of graph nodes. This can either be as a `union` (the default), as an intersection of selections with `intersect`, or, as a `difference` on the previous selection, if it exists.

### Value

a graph object of class `dgr_graph`.

### Examples

    # Create a node data frame (ndf)
    ndf <-
      create_node_df(n = 10)

    # Create a graph
    graph <-
      create_graph(
        nodes_df = ndf)

    # Select nodes `1` to `5` and show that
    # selection of nodes with `get_selection()`
    graph %>%
      select_nodes_by_id(nodes = 1:5) %>%
      get_selection()

[Package DiagrammeR version 1.0.1 Index]