path: Helper function to add or delete edges along a path

Description Usage Arguments Details Value See Also Examples

View source: R/operators.R

Description

This function can be used to add or delete edges that form a path.

Usage

1

Arguments

...

See details below.

Details

When adding edges via +, all unnamed arguments are concatenated, and each element of a final vector is interpreted as a vertex in the graph. For a vector of length n+1, n edges are then added, from vertex 1 to vertex 2, from vertex 2 to vertex 3, etc. Named arguments will be used as edge attributes for the new edges.

When deleting edges, all attributes are concatenated and then passed to delete_edges.

Value

A special object that can be used together with igraph graphs and the plus and minus operators.

See Also

Other functions for manipulating graph structure: +.igraph(), add_edges(), add_vertices(), delete_edges(), delete_vertices(), edge(), igraph-minus, vertex()

Examples

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# Create a (directed) wheel
g <- make_star(11, center = 1) + path(2:11, 2)
plot(g)

g <- make_empty_graph(directed = FALSE, n = 10) %>%
  set_vertex_attr("name", value = letters[1:10])

g2 <- g + path("a", "b", "c", "d")
plot(g2)

g3 <- g2 + path("e", "f", "g", weight=1:2, color="red")
E(g3)[[]]

g4 <- g3 + path(c("f", "c", "j", "d"), width=1:3, color="green")
E(g4)[[]]

Example output

Attaching package: 'igraph'

The following objects are masked from 'package:stats':

    decompose, spectrum

The following object is masked from 'package:base':

    union

+ 5/5 edges from 5417bdb (vertex names):
  tail head tid hid weight color
1    a    b   1   2     NA  <NA>
2    b    c   2   3     NA  <NA>
3    c    d   3   4     NA  <NA>
4    e    f   5   6      1   red
5    f    g   6   7      2   red
+ 8/8 edges from 4b31048 (vertex names):
  tail head tid hid weight color width
1    a    b   1   2     NA  <NA>    NA
2    b    c   2   3     NA  <NA>    NA
3    c    d   3   4     NA  <NA>    NA
4    e    f   5   6      1   red    NA
5    f    g   6   7      2   red    NA
6    c    f   3   6     NA green     1
7    c    j   3  10     NA green     2
8    d    j   4  10     NA green     3

igraph documentation built on March 19, 2020, 5:13 p.m.

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