Use this if you are using igraph from R
Calculate the maximal (weakly or strongly) connected components of a graph
component_distribution(graph, cumulative = FALSE, mul.size = FALSE, ...) components(graph, mode = c("weak", "strong"))
graph |
The graph to analyze. |
cumulative |
Logical, if TRUE the cumulative distirubution (relative frequency) is calculated. |
mul.size |
Logical. If TRUE the relative frequencies will be multiplied by the cluster sizes. |
... |
Additional attributes to pass to |
mode |
Character string, either “weak” or “strong”. For directed graphs “weak” implies weakly, “strong” strongly connected components to search. It is ignored for undirected graphs. |
is_connected
decides whether the graph is weakly or strongly
connected. The null graph is considered disconnected.
components
finds the maximal (weakly or strongly) connected components
of a graph.
count_components
does almost the same as components
but returns only
the number of clusters found instead of returning the actual clusters.
component_distribution
creates a histogram for the maximal connected
component sizes.
The weakly connected components are found by a simple breadth-first search. The strongly connected components are implemented by two consecutive depth-first searches.
For is_connected
a logical constant.
For components
a named list with three components:
membership |
numeric vector giving the cluster id to which each vertex belongs. |
csize |
numeric vector giving the sizes of the clusters. |
no |
numeric constant, the number of clusters. |
For count_components
an integer constant is returned.
For component_distribution
a numeric vector with the relative
frequencies. The length of the vector is the size of the largest component
plus one. Note that (for currently unknown reasons) the first element of the
vector is the number of clusters of size zero, so this is always zero.
Gabor Csardi csardi.gabor@gmail.com
decompose
, subcomponent
, groups
g <- sample_gnp(20, 1/20) clu <- components(g) groups(clu)