Graph properties summary and graph decomposition

Produces a summary of network properties and returns graph components (ordered by decreasing size), without self-loops.

properties(graph, data = NULL, ...)

Arguments

graph

Input network as an igraph object.

data

An optional data matrix (default data = NULL) whith rows corresponding to subjects, and columns to graph nodes (variables). Nodes will be mapped onto variable names.

...

Currently ignored.

Value

List of graph components, ordered by decreasing size (the first component is the giant one), without self-loops.

Author

Mario Grassi mario.grassi@unipv.it

Examples

# Extract the "Type II diabetes mellitus" pathway:
g <- kegg.pathways[["Type II diabetes mellitus"]]
summary(g)
#> IGRAPH 218cd1b DNW- 47 130 -- 
#> + attr: name (v/c), weight (e/n)
properties(g)
#> Frequency distribution of graph components
#> 
#>   n.nodes n.graphs
#> 1       7        1
#> 2      39        1
#> 
#> Percent of vertices in the giant component: 83 %
#> 
#>   is.simple      is.dag is.directed is.weighted 
#>        TRUE       FALSE        TRUE        TRUE 
#> 
#> which.mutual.FALSE 
#>                120 
#> [[1]]
#> IGRAPH b12a2a0 DNW- 39 120 -- 
#> + attr: name (v/c), weight (e/n)
#> + edges from b12a2a0 (vertex names):
#>  [1] 110117499->6517      110117499->2475      110117499->5590     
#>  [4] 5290     ->6517      5290     ->2475      5290     ->5590     
#>  [7] 5291     ->6517      5291     ->2475      5291     ->5590     
#> [10] 5293     ->6517      5293     ->2475      5293     ->5590     
#> [13] 5295     ->6517      5295     ->2475      5295     ->5590     
#> [16] 5296     ->6517      5296     ->2475      5296     ->5590     
#> [19] 8503     ->6517      8503     ->2475      8503     ->5590     
#> [22] 3667     ->110117499 3667     ->5290      3667     ->5291     
#> + ... omitted several edges
#> 
#> [[2]]
#> IGRAPH b12a23e DNW- 7 10 -- 
#> + attr: name (v/c), weight (e/n)
#> + edges from b12a23e (vertex names):
#>  [1] 2645 ->5313 2645 ->5315 3098 ->5313 3098 ->5315 3099 ->5313 3099 ->5315
#>  [7] 3101 ->5313 3101 ->5315 80201->5313 80201->5315
#>