rgraph6 (version 2.0-4)

choose_format: Choose most efficient format heuristically

Description

Given a graph suggest the most efficient format out of 'graph6', 'sparse6' or 'digraph6'.

Usage

choose_format(object, ...)
# S3 method for default
choose_format(object, ...)
# S3 method for list
choose_format(object, ...)

Value

Character value out of 'graph6', 'sparse6' or 'digraph6'. If object

is a list, a vector of such values of the length equal to the length of object.

Arguments

object

Igraph/network object or list thereof

...

other arguments, currently ignored

Details

If object is directed, the suggested format is 'digraph6'. If object is undirected the function suggests 'sparse6' if density is less than 0.15 and 'graph6' otherwise. This rule is approximate.

Examples

# From igraph ------------------------------------------------------
if(requireNamespace("igraph")) {
   g <- igraph::graph.famous("Zachary")
   choose_format(g)
   
   set.seed(123)
   glist <- list(
      igraph::sample_gnp(n = 15, p = 0.1),
      igraph::sample_gnp(n = 15, p = 0.2), 
      igraph::sample_gnp(n = 15, p = 0.3),
      igraph::sample_gnp(n = 15, p = 0.15, directed = TRUE))
      
   choose_format(glist)
}

# From network -----------------------------------------------------
if(requireNamespace("network")) {
   m <- matrix(rbinom(25,1,.4),15,15)
   diag(m) <- 0
   g <- network::network(m, directed=FALSE)
   choose_format(g)
}