addRandomEdges: Add random edges to a supply network

In MiloMonnier/supplynet: Supply network design and robustness assessment tools

Description

Add random edges to a supply network

Usage

addRandomEdges(
  g,
  n = 1,
  from = NULL,
  to = NULL,
  v2connect = NULL,
  multi.edges = FALSE,
  iie.ceil = 4
)

Arguments

g	An igraph object.
n	numeric; the number of edges to add.
from	igraph.vs or character names; vertices sequence of possible edges origins (default: NULL).
to	igraph.vs or character names; vertices sequence of possible edges origins (default: NULL).
v2connect	igraph.vs or character names; vertices sequence edges origin or destinations must be attached to (default: NULL).
multi.edges	boolean; wheter or not multiple edges can be created (default: FALSE).
iie.ceil	numeric; maximal number of edges between intermediaries in the graph (default: 4). TODO Must be changed to Inf

Value

An igraph object with n more edges.

Examples

## Generate a theoretical supply network, define producers (P),
## intermediaries (I) and distributors (D) vertices.
library(igraph)
g = make_tree(10)
V(g)[!degree(g, mode="in")]$type = "P"
V(g)[degree(g, mode="in") & degree(g, mode="in")]$type = "I"
V(g)[!degree(g, mode="out")]$type = "D"
V(g)$color = c("red","green","blue")[factor(V(g)$type)]
plot(g)
## Add 5 edges going from P to D (short supply chains)
g2 = addRandomEdges(g, n=5, from=V(g)[type=="P"], to=V(g)[type=="D"])
plot(g2)
## Add 3 edges connected to I (belonging long supply chains)
g2 = addRandomEdges(g, n=3, v2connect=V(g)[type=="I"])

MiloMonnier/supplynet documentation built on Feb. 16, 2021, 8:03 p.m.