graph: Create a graph

In simplegraph: Simple Graph Data Types and Basic Algorithms

Create a graph

Description

Graphs can be specified as adjacency lists or (two) data frames.

Usage

graph(x, ...)

Arguments

x	A data frame, or a named list of character vectors. See details below.
...	Additional arguments, see details below.

Details

If the first argument is a data frame, then it is interpreted as vertex data, and a second data frame must be supplied as edge data. The first column of the vertex data must contain (character) vertex ids. The first two columns of the edge data frame must contain the directed edges of the graph, in the order of tail and head, as characters referring to the nodes ids. Other columns are kept as metadata.

If the first argument is not a data frame, but a list, then it is interpreted as an adjacency list. It must be named, and the names will be used as vertex ids. Each list element must be a character vector containing the successors of each vertex.

Value

A graph object.

Examples

funcs <- graph(list(
  drop_internal = character(0),
  get_deps = c("get_description", "parse_deps",
    "%||%", "drop_internal"),
  get_description = "pkg_from_filename",
  parse_deps = "str_trim",
  cran_file = c("get_pkg_type", "r_minor_version", "cran_file"),
  download_urls = c("split_pkg_names_versions", "cran_file"),
  filename_from_url = character(0),
  get_pkg_type = character(0),
  pkg_download = c("dir_exists", "download_urls",
    "filename_from_url", "try_download"),
  r_minor_version = character(0),
  try_download = character(0),
  drop_missing_deps = character(0),
  install_order = character(0),
  restore = c("pkg_download", "drop_missing_deps",
    "install_order", "get_deps"),
  snap = character(0),
  `%||%` = character(0),
  data_frame = character(0),
  dir_exists = character(0),
  pkg_from_filename = character(0),
  split_pkg_names_versions = "data_frame",
  str_trim = character(0)
))
funcs

vertices <- data.frame(
  stringsAsFactors = FALSE,
  name = c("Tom Hanks", "Cate Blanchett", "Matt Damon", "Kate Winslet",
    "Saving Private Ryan", "Contagion", "The Talented Mr. Ripley"),
  what = c("actor", "actor", "actor", "actor", "movie", "movie", "movie"),
  born = c("1956-07-09", "1966-05-26", "1970-10-08", "1975-10-05",
    NA, NA, NA),
  gender = c("M", "F", "M", "F", NA, NA, NA),
  year = c(NA, NA, NA, NA, 1998, 2011, 1999)
)

edges <- data.frame(
  stringsAsFactors = FALSE,
  actor = c("Tom Hanks", "Cate Blanchett", "Matt Damon", "Matt Damon",
    "Kate Winslet"),
  movie = c("Saving Private Ryan", "The Talented Mr. Ripley",
    "Saving Private Ryan", "The Talented Mr. Ripley", "Contagion")
)
actors <- graph(vertices, edges)
actors

simplegraph documentation built on Aug. 31, 2023, 9:07 a.m.