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% Generated by roxygen2 (4.1.1): do not edit by hand
% Please edit documentation in R/attributes.R
\name{edge_attr}
\alias{edge.attributes}
\alias{edge_attr}
\alias{get.edge.attribute}
\title{Query edge attributes of a graph}
\usage{
edge_attr(graph, name, index = E(graph))
}
\arguments{
\item{graph}{The graph}
\item{name}{The name of the attribute to query. If missing, then
all edge attributes are returned in a list.}
\item{index}{An optional edge sequence, to query edge attributes
for a subset of edges.}
}
\value{
The value of the edge attribute, or the list of all
edge attributes if \code{name} is missing.
}
\description{
Query edge attributes of a graph
}
\examples{
g <- make_ring(10) \%>\%
set_edge_attr("weight", value = 1:10) \%>\%
set_edge_attr("color", value = "red")
g
plot(g, edge.width = E(g)$weight)
}
\seealso{
Other graph attributes: \code{\link{$.igraph.vs}},
\code{\link{$<-.igraph.vs}}, \code{\link{V<-}},
\code{\link{[<-.igraph.vs}},
\code{\link{[[<-.igraph.vs}},
\code{\link{igraph-vs-attributes}},
\code{\link{igraph-vs-attributes}},
\code{\link{igraph-vs-attributes}},
\code{\link{igraph-vs-attributes}},
\code{\link{igraph-vs-attributes}};
\code{\link{$.igraph}}, \code{\link{$<-.igraph}},
\code{\link{igraph-dollar}}, \code{\link{igraph-dollar}};
\code{\link{attributes}}, \code{\link{graph_attr_names}},
\code{\link{list.graph.attributes}};
\code{\link{delete_edge_attr}},
\code{\link{remove.edge.attribute}};
\code{\link{delete_graph_attr}},
\code{\link{remove.graph.attribute}};
\code{\link{delete_vertex_attr}},
\code{\link{remove.vertex.attribute}};
\code{\link{edge.attributes<-}},
\code{\link{edge_attr<-}}; \code{\link{edge_attr_names}},
\code{\link{list.edge.attributes}};
\code{\link{get.graph.attribute}},
\code{\link{graph.attributes}}, \code{\link{graph_attr}};
\code{\link{get.vertex.attribute}},
\code{\link{vertex.attributes}},
\code{\link{vertex_attr}};
\code{\link{graph.attributes<-}},
\code{\link{graph_attr<-}};
\code{\link{list.vertex.attributes}},
\code{\link{vertex_attr_names}};
\code{\link{set.edge.attribute}},
\code{\link{set_edge_attr}};
\code{\link{set.graph.attribute}},
\code{\link{set_graph_attr}};
\code{\link{set.vertex.attribute}},
\code{\link{set_vertex_attr}};
\code{\link{vertex.attributes<-}},
\code{\link{vertex_attr<-}}
}
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