Graph rewiring while preserving the degree distribution

This function can be used together with rewire() to randomly rewire the edges while preserving the original graph's degree distribution.

Usage

keeping_degseq(loops = FALSE, niter = 100)

Arguments

loops: Whether to allow destroying and creating loop edges.
niter: Number of rewiring trials to perform.

Details

The rewiring algorithm chooses two arbitrary edges in each step ((a,b) and (c,d)) and substitutes them with (a,d) and (c,b), if they not already exists in the graph. The algorithm does not create multiple edges.

Author

Tamas Nepusz ntamas@gmail.com and Gabor Csardi csardi.gabor@gmail.com

Examples

g <- make_ring(10)
g %>%
  rewire(keeping_degseq(niter = 20)) %>%
  degree()
#>  [1] 2 2 2 2 2 2 2 2 2 2
print_all(rewire(g, with = keeping_degseq(niter = vcount(g) * 10)))
#> IGRAPH bc4b0d1 U--- 10 10 -- Ring graph
#> + attr: name (g/c), mutual (g/l), circular (g/l)
#> + graph attributes:
#> | + name:
#> |   [1] "Ring graph"
#> | + mutual:
#> |   [1] FALSE
#> | + circular:
#> |   [1] TRUE
#> + edges from bc4b0d1:
#>  [1] 2-- 8 3-- 7 6-- 9 4-- 5 5--10 1-- 7 6--10 2-- 3 4-- 9 1-- 8