Manipulation: Manipulation of multilayer networks

In multinet: Analysis and mining of multilayer social networks

Manipulation of multilayer networks

Description

Functions to add or remove objects in a multilayer network.

The functions add_vertices_ml and delete_vertices_ml add/remove the input actors to/from the input layers. Since version 3.1, the actors in the network correspond to the union of all the actors in the various layers (that is, the vertices).

A layer can also be added from an igraph object, where the vertex attribute name represents the actor name, using the add_igraph_layer_ml function.

The functions add_nodes_ml and delete_nodes_ml are deprecated in the current version of the library. The names vertex/vertices are now preferentially used over node/nodes.

Usage

add_layers_ml(n, layers, directed=FALSE)
add_vertices_ml(n, vertices)
add_edges_ml(n, edges)

add_igraph_layer_ml(n, g, name)

delete_layers_ml(n, layers)
delete_actors_ml(n, actors)
delete_vertices_ml(n, vertices)
delete_edges_ml(n, edges)

Arguments

n	A multilayer network.
layers	An array of names of layers.
actors	An array of names of actors.
g	An igraph object with simple edges and a vertex attribute called name storing the actor name corresponding to the vertex.
name	Name of the new layer.
directed	Determines if the layer(s) is (are) directed or undirected. If multiple layers are specified, directed should be either a single value or an array with as many values as the number of layers.
vertices	A dataframe of vertices to be updated or deleted. The first column specifies actor names, the second layer names.
edges	A dataframe containing the edges to be connected or deleted. The four columns must contain, in this order: actor1 name, layer1 name, actor2 name, layer2 name.

Value

These functions return no value: they modify the input network.

See Also

multinet.properties, multinet.edge_directionality

Examples

net <- ml_empty()
# Adding some layers
add_layers_ml(net,"l1")
add_layers_ml(net,c("l2","l3"),c(TRUE,FALSE))
layers_ml(net)
# Adding some vertices (actor A3 is not present in layer l3: no corresponding vertex there)
vertices <- data.frame(
    c("A1","A2","A3","A1","A2","A3"),
    c("l1","l1","l1","l2","l2","l2"))
add_vertices_ml(net,vertices)
vertices <- data.frame(
    c("A1","A2"),
    c("l3","l3"))
add_vertices_ml(net,vertices)
vertices_ml(net)
# Verifying that the actors have been added correctly
num_actors_ml(net)
actors_ml(net)
# We create a data frame specifying two edges:
# A2,l2 -- A3,l1
# A2,l2 -- A3,l2
edges <- data.frame(
    c("A2","A2"),
    c("l2","l2"),
    c("A3","A3"),
    c("l1","l2"))
add_edges_ml(net,edges)
edges_ml(net)

# The following deletes layer 1, and also deletes
# all vertices from "l1" and the edge with an end-point in "l1"
delete_layers_ml(net,"l1")
# The following also deletes the vertices associated to
# "A1" in layers "l2" and "l3"
delete_actors_ml(net,"A1")
# deleting vertex A2,l3 and edge A2,l2 -- A3,l2
delete_vertices_ml(net,data.frame("A2","l3"))
edges <- data.frame("A2","l2","A3","l2")
delete_edges_ml(net,edges)
net

multinet documentation built on Feb. 16, 2023, 10:57 p.m.