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% Generated by roxygen2 (4.1.1): do not edit by hand
% Please edit documentation in R/operators.R
\name{vertex}
\alias{vertex}
\alias{vertices}
\title{Helper function for adding and deleting vertices}
\usage{
vertex(...)
vertices(...)
}
\arguments{
\item{...}{See details below.}
}
\value{
A special object that can be used with together with
igraph graphs and the plus and minus operators.
}
\description{
This is a helper function that simplifies adding and deleting
vertices to/from graphs.
}
\details{
\code{vertices} is an alias for \code{vertex}.
When adding vertices via \code{+}, all unnamed arguments are interpreted
as vertex names of the new vertices. Named arguments are interpreted as
vertex attributes for the new vertices.
When deleting vertices via \code{-}, all arguments of \code{vertex} (or
\code{vertices}) are concatenated via \code{c()} and passed to
\code{\link{delete_vertices}}.
}
\examples{
g <- make_(ring(10), with_vertex_(name = LETTERS[1:10])) +
vertices('X', 'Y')
g
plot(g)
}
\seealso{
Other functions for manipulating graph structure: \code{\link{+.igraph}};
\code{\link{-.igraph}}, \code{\link{igraph-minus}};
\code{\link{add.edges}}, \code{\link{add_edges}};
\code{\link{add.vertices}}, \code{\link{add_vertices}};
\code{\link{delete.edges}}, \code{\link{delete_edges}};
\code{\link{delete.vertices}},
\code{\link{delete_vertices}}; \code{\link{edge}},
\code{\link{edges}}; \code{\link{path}}
}
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