$
运算符是一种语法糖,用于查询和设置顶点序列中顶点的属性。
用法
# S3 method for class 'igraph.vs'
x[[i]] <- value
# S3 method for class 'igraph.vs'
x[i] <- value
# S3 method for class 'igraph.vs'
x$name
# S3 method for class 'igraph.vs'
x$name <- value
V(x) <- value
详细信息
$
的查询形式是 vertex_attr()
的快捷方式,例如 V(g)[idx]$attr
等同于 vertex_attr(g, attr, V(g)[idx])
。
$
的赋值形式是 set_vertex_attr()
的快捷方式,例如 V(g)[idx]$attr <- value
等同于 g <- set_vertex_attr(g, attr, V(g)[idx], value)
。
参见
其他顶点和边序列:E()
, V()
, as_ids()
, igraph-es-attributes
, igraph-es-indexing
, igraph-es-indexing2
, igraph-vs-indexing
, igraph-vs-indexing2
, print.igraph.es()
, print.igraph.vs()
顶点、边和图属性 delete_edge_attr()
, delete_graph_attr()
, delete_vertex_attr()
, edge_attr()
, edge_attr<-()
, edge_attr_names()
, graph_attr()
, graph_attr<-()
, graph_attr_names()
, igraph-attribute-combination
, igraph-dollar
, set_edge_attr()
, set_graph_attr()
, set_vertex_attr()
, set_vertex_attrs()
, vertex_attr()
, vertex_attr<-()
, vertex_attr_names()
示例
g <- make_(
ring(10),
with_vertex_(
name = LETTERS[1:10],
color = sample(1:2, 10, replace = TRUE)
)
)
V(g)$name
#> [1] "A" "B" "C" "D" "E" "F" "G" "H" "I" "J"
V(g)$color
#> [1] 2 1 1 1 1 2 1 1 2 2
V(g)$frame.color <- V(g)$color
# color vertices of the largest component
largest_comp <- function(graph) {
cl <- components(graph)
V(graph)[which.max(cl$csize) == cl$membership]
}
g <- sample_(
gnp(100, 2 / 100),
with_vertex_(size = 3, label = ""),
with_graph_(layout = layout_with_fr)
)
giant_v <- largest_comp(g)
V(g)$color <- "blue"
V(g)[giant_v]$color <- "orange"
plot(g)