% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/interface.R
\name{neighbors}
\alias{neighbors}
\title{Neighboring (adjacent) vertices in a graph}
\usage{
neighbors(graph, v, mode = c("out", "in", "all", "total"))
}
\arguments{
\item{graph}{The input graph.}

\item{v}{The vertex of which the adjacent vertices are queried.}

\item{mode}{Whether to query outgoing (\sQuote{out}), incoming
(\sQuote{in}) edges, or both types (\sQuote{all}). This is
ignored for undirected graphs.}
}
\value{
A vertex sequence containing the neighbors of the input vertex.
}
\description{
A vertex is a neighbor of another one (in other words, the two
vertices are adjacent), if they are incident to the same edge.
}
\section{Related documentation in the C library}{
\href{https://igraph.org/c/html/0.10.17/igraph-Basic.html#igraph_neighbors}{\code{neighbors()}}, \href{https://igraph.org/c/html/0.10.17/igraph-Basic.html#igraph_vcount}{\code{vcount()}}
}

\examples{
g <- make_graph("Zachary")
n1 <- neighbors(g, 1)
n34 <- neighbors(g, 34)
intersection(n1, n34)
}
\seealso{
Other structural queries: 
\code{\link{[.igraph}()},
\code{\link{[[.igraph}()},
\code{\link{adjacent_vertices}()},
\code{\link{are_adjacent}()},
\code{\link{ends}()},
\code{\link{get_edge_ids}()},
\code{\link{gorder}()},
\code{\link{gsize}()},
\code{\link{head_of}()},
\code{\link{incident}()},
\code{\link{incident_edges}()},
\code{\link{is_directed}()},
\code{\link{tail_of}()}
}
\concept{structural queries}
