closeness | R Documentation |
Closeness centrality measures how many steps is required to access every other vertex from a given vertex.
closeness( graph, vids = V(graph), mode = c("out", "in", "all", "total"), weights = NULL, normalized = FALSE, cutoff = -1 )
graph |
The graph to analyze. |
vids |
The vertices for which closeness will be calculated. |
mode |
Character string, defined the types of the paths used for measuring the distance in directed graphs. “in” measures the paths to a vertex, “out” measures paths from a vertex, all uses undirected paths. This argument is ignored for undirected graphs. |
weights |
Optional positive weight vector for calculating weighted
closeness. If the graph has a |
normalized |
Logical scalar, whether to calculate the normalized closeness, i.e. the inverse average distance to all reachable vertices. The non-normalized closeness is the inverse of the sum of distances to all reachable vertices. |
cutoff |
The maximum path length to consider when calculating the closeness. If zero or negative then there is no such limit. |
The closeness centrality of a vertex is defined as the inverse of the sum of distances to all the other vertices in the graph:
1/sum( d(v,i), i != v)
If there is no (directed) path between vertex v
and i
, then
i
is omitted from the calculation. If no other vertices are reachable
from v
, then its closeness is returned as NaN.
cutoff
or smaller. This can be run for larger graphs, as the running
time is not quadratic (if cutoff
is small). If cutoff
is zero
or negative (which is the default), then the function calculates the exact
closeness scores. Using zero as a cutoff is deprecated and future
versions (from 1.4.0) will treat zero cutoff literally (i.e. no paths
considered at all). If you want no cutoff, use a negative number.
estimate_closeness
is an alias for closeness
with a different
argument order, for sake of compatibility with older versions of igraph.
Closeness centrality is meaningful only for connected graphs. In disconnected
graphs, consider using the harmonic centrality with
harmonic_centrality
Numeric vector with the closeness values of all the vertices in
v
.
Gabor Csardi csardi.gabor@gmail.com
Freeman, L.C. (1979). Centrality in Social Networks I: Conceptual Clarification. Social Networks, 1, 215-239.
betweenness
, degree
, harmonic_centrality
g <- make_ring(10) g2 <- make_star(10) closeness(g) closeness(g2, mode="in") closeness(g2, mode="out") closeness(g2, mode="all")
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