migraph (version 0.10.6)

transform: Tools for transforming networks, graphs, and matrices

Description

These functions offer tools for transforming migraph-consistent objects (matrices, igraph, tidygraph, or network objects). Transforming means that the returned object may have different dimensions than the original object.

Usage

to_mode1(object)
to_mode2(object)
to_main_component(object)
to_subgraph(object, ...)
to_ties(object)
to_blocks(object, membership, FUN = mean)

Arguments

object

An object of a migraph-consistent class:

• matrix (adjacency or incidence) from {base} R

• edgelist, a data frame from {base} R or tibble from {tibble}

• igraph, from the {igraph} package

• network, from the {network} package

• tbl_graph, from the {tidygraph} package

...

Arguments passed on to dplyr::filter

membership

A vector of partition memberships

FUN

A function for summarising block content. By default mean. Other recommended options include median, sum, min or max.

Functions

• to_mode1: Results in a weighted one-mode object that retains the row nodes from a two-mode object, and weights the ties between them on the basis of their joint ties to nodes in the second mode (columns)

• to_mode2: Results in a weighted one-mode object that retains the column nodes from a two-mode object, and weights the ties between them on the basis of their joint ties to nodes in the first mode (rows).

• to_main_component: Returns an object that includes only the main component without any smaller components or isolates

• to_subgraph: Returns a network subgraph filtered on the basis of some node-related logical statement.

• to_ties: Returns a matrix (named if possible) where the edges are the nodes

• to_blocks: Returns a reduced graph from a given partition membership vector

Details

Since some modifications are easier to implement for some objects than others, here are the currently implemented modifications:

to_	edgelists	matrices	igraph	tidygraph	network
mode1		X	X	X
mode2		X	X	X
main_component			X	X	X
subgraph	X	X	X	X	X
ties	X	X	X	X	X
blocks	X	X	X	X	X

Note that to_subgraph() returns a 'tidygraph' object, to_ties() returns an 'igraph' object, and to_blocks() returns a 'matrix' object.

See Also

Other manipulations: add, as(), grab, reformat

Examples

autographr(ison_southern_women) /
(autographr(to_mode1(ison_southern_women)) |
autographr(to_mode2(ison_southern_women)))
autographr(ison_adolescents) +  
autographr(to_ties(ison_adolescents))
(adolblock <- to_blocks(ison_adolescents, 
  node_regular_equivalence(ison_adolescents, k = 3)))
autographr(adolblock)