import_graph {DiagrammeR}

Import a graph from various graph formats

Description

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

## Not run: 
# 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()

## End(Not run)