1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
|
% Generated by roxygen2 (4.1.1): do not edit by hand
% Please edit documentation in R/basic.R
\name{head_of}
\alias{head_of}
\title{Head of the edge(s) in a graph}
\usage{
head_of(graph, es)
}
\arguments{
\item{graph}{The input graph.}
\item{es}{The edges to query.}
}
\value{
A vertex sequence with the head(s) of the edge(s).
}
\description{
For undirected graphs, head and tail is not defined. In this case
\code{head_of} returns vertices incident to the supplied edges, and
\code{tail_of} returns the other end(s) of the edge(s).
}
\seealso{
Other structural queries: \code{\link{[.igraph}};
\code{\link{[[.igraph}}; \code{\link{adjacent_vertices}};
\code{\link{are.connected}}, \code{\link{are_adjacent}};
\code{\link{ecount}}, \code{\link{gsize}};
\code{\link{ends}}, \code{\link{get.edge}},
\code{\link{get.edges}}; \code{\link{get.edge.ids}};
\code{\link{gorder}}, \code{\link{vcount}};
\code{\link{incident_edges}}; \code{\link{incident}};
\code{\link{is.directed}}, \code{\link{is_directed}};
\code{\link{neighbors}}; \code{\link{tail_of}}
}
|
