set_edge_attrs {DiagrammeR} | R Documentation

## Set edge attribute values

### Description

From a graph object of class `dgr_graph`, set edge attribute values for one or more edges.

### Usage

    set_edge_attrs(graph, edge_attr, values, from = NULL, to = NULL)

### Arguments

`graph` | a graph object of class `dgr_graph`.
`edge_attr` | the name of the attribute to set.
`values` | the values to be set for the chosen attribute for the chosen edges.
`from` | an optional vector of node IDs from which the edge is outgoing for filtering list of nodes with outgoing edges in the graph.
`to` | an optional vector of node IDs from which the edge is incoming for filtering list of nodes with incoming edges in the graph.

### Value

a graph object of class `dgr_graph`.

### Examples

    # Create a simple graph
    ndf <-
      create_node_df(
        n = 4,
        type = "basic",
        label = TRUE,
        value = c(3.5, 2.6, 9.4, 2.7))

    edf <-
      create_edge_df(
        from = c(1, 2, 3),
        to = c(4, 3, 1),
        rel = "leading_to")

    graph <-
      create_graph(
        nodes_df = ndf,
        edges_df = edf)

    # Set attribute `color = "green"`
    # for edges `1`->`4` and `3`->`1`
    # in the graph
    graph <-
      graph %>%
      set_edge_attrs(
        edge_attr = color,
        values = "green",
        from = c(1, 3),
        to = c(4, 1))

    # Set attribute `color = "blue"`
    # for all edges in the graph
    graph <-
      graph %>%
      set_edge_attrs(
        edge_attr = color,
        values = "blue")

    # Set attribute `color = "pink"`
    # for all edges in graph outbound
    # from node with ID value `1`
    graph <-
      graph %>%
      set_edge_attrs(
        edge_attr = color,
        values = "pink",
        from = 1)

    # Set attribute `color = "black"`
    # for all edges in graph inbound
    # to node with ID `1`
    graph <-
      graph %>%
      set_edge_attrs(
        edge_attr = color,
        values = "black",
        to = 1)

[Package DiagrammeR version 1.0.1 Index]