Import a graph from various graph formats — import

Import a variety of graphs from different graph formats and create a graph object.

Usage

import_graph(
  graph_file,
  file_type = NULL,
  edges_extra_attr_names = NULL,
  edges_extra_attr_coltypes = NULL,
  graph_name = NULL,
  attr_theme = "default",
  write_backups = FALSE,
  display_msgs = FALSE
)

Arguments

graph_file: A connection to a graph file. When provided as a path to a file, it will read the file from disk. Files starting with http://, https://, ftp://, or ftps:// will be automatically downloaded.
file_type: The type of file to be imported. Options are: gml (GML), sif (SIF), edges (a .edges file), and mtx (MatrixMarket format). If not supplied, the type of graph file will be inferred by its file extension.
edges_extra_attr_names: For edges files, a vector of attribute names beyond the from and to data columns can be provided in the order they appear in the input data file.
edges_extra_attr_coltypes: For edges files, this is a string of column types for any attribute columns provided for edges_extra_attr_names. This string representation is where each character represents each of the extra columns of data and the mappings are: c -> character, i -> integer, n -> number, d -> double, l -> logical, D -> date, T -> date time, t -> time, ? -> guess, or _/-, which skips the column.
graph_name: An optional string for labeling the graph object.
attr_theme: The theme (i.e., collection of graph, node, and edge global graph attributes) to use for this graph. The default theme is called default; there are hierarchical layout themes called lr, tb, rl, and bt (these operate from left-to-right, top-to-bottom, right-to-left, and bottom-to-top); and, for larger graphs, the fdp theme provides a force directed layout. If this is set to NULL then no global graph attributes will be applied to the graph upon creation.
write_backups: An option to write incremental backups of changing graph states to disk. If TRUE, a subdirectory within the working directory will be created and used to store RDS files. The default value is FALSE so one has to opt in to use this functionality.
display_msgs: An option to display messages primarily concerned with changes in graph selections. By default, this is FALSE.

Value

A graph object of class dgr_graph.

Examples

if (FALSE) {
# Import a GML graph file
gml_graph <-
  import_graph(
    system.file(
      "extdata/karate.gml",
      package = "DiagrammeR"))

# Get a count of the graph's nodes
gml_graph %>%
  count_nodes()

# Get a count of the graph's edges
gml_graph %>%
  count_edges()
}