In weighted graphs, a real number is assigned to each
(directed or undirected) edge.
Usage
is.weighted(graph)
Arguments
graph
The input graph.
Value
A logical scalar.
concept
Weighted graphs
Details
In igraph edge weights are represented via an edge attribute, called
weight. The is.weighted function only checks that such
an attribute exists. (It does not even checks that it is a numeric edge
attribute.)
Edge weights are used for different purposes by the different
functions. E.g. shortest path functions use it as the cost of the
path; community finding methods use it as the strength of the
relationship between two vertices, etc. Check the manual pages of the
functions working with weighted graphs for details.