geom_edgelabels: Plotting of a population graph edge labels using ggplot...

In popgraph: This is an R package that constructs and manipulates population graphs.

Description

This function allows you to layer the edgeset lables from a popgraph object

Usage

geom_edgelabels(mapping = NULL, graph = NULL, directed = FALSE,
  offset = c(0, 0), ...)

Arguments

mapping	The aesthetic mapping as an aes() object. This aesthetic must at least have values for x, y, and label
graph	The popgraph/igraph object to be plot
directed	A flag indicating that you should only plot the edge with the largest weight if more than one edge connects nodes.
offset	The amount added to each X,Y coordinate to move the label off the line (default=c(0,0)).
...	Options passed to geom_text like color, etc.

Value

A formatted geom_text object for addition to a ggplot()

Author(s)

Rodney J. Dyer <[e-mail]>

Examples

a <- matrix( c(0,1,0,1,1,0,0,1,0,0,0,1,1,1,1,0),nrow=4)
rownames(a) <- colnames(a) <- LETTERS[1:4]
graph <- as.popgraph(a)
igraph::V(graph)$x <- runif(4)
igraph::V(graph)$y <- runif(4)
igraph::E(graph)$Label <- LETTERS[1:4]
require(ggplot2)
p <- ggplot() + geom_edgeset( aes(x=x,y=y), graph )
p + geom_edgelabels(aes(x=x,y=y,label=Label),graph)
p + geom_edgelabels(aes(x=x,y=y,label=Label),graph,color="red")
p + geom_edgelabels(aes(x=x,y=y,label=Label),graph,color="red", offset=c(.005,-0.004))

Example output

Loading required package: ggplot2
Loading required package: igraph

Attaching package: 'igraph'

The following objects are masked from 'package:stats':

    decompose, spectrum

The following object is masked from 'package:base':

    union

popgraph documentation built on April 14, 2017, 9:58 p.m.