arcdiagram (version 0.1.12)

node_coords: Node Coordinates

Description

Computes axis locations of each node. This function can be helpful when you want to separately plot the node labels using the function mtext.

Usage

node_coords(edgelist, sorted = FALSE, decreasing = FALSE,
    ordering = NULL, labels = NULL)

Arguments

edgelist

basically a two-column matrix with edges (see graph)

sorted

logical to indicate if nodes should be sorted

decreasing

logical to indicate type of sorting (used only when sorted=TRUE)

ordering

optional numeric vector providing the ordering of nodes (when provided, this parameter overrides sorted=TRUE)

labels

character vector with labels for the nodes

Value

a vector with the location of nodes in the x-axis

See Also

arcplot

Examples

# NOT RUN {
 # generate a graph
 some_graph = graph.ring(10)

 # add names to nodes
 V(some_graph)$name = letters[1:vcount(some_graph)]

 # extract edgelist
 edgelist = get.edgelist(some_graph)

 # (default) arc diagram
 arcplot(edgelist, labels=V(some_graph)$name, las=1)

 # get x-axis coordinates of nodes
 xcoords = node_coords(edgelist, labels=V(some_graph)$name)

 # arc diagram with various labels
 arcplot(edgelist, show.labels=FALSE, show.nodes=TRUE)
 mtext(V(some_graph)$name, side=1, line=0, at=xcoords)
 mtext(rep("node",10), side=1, line=1, at=xcoords, col="gray90")
 
# }