frcd: Force directed layout

In mplex/multigraph: Plot and Manipulate Multigraphs

Force directed layout

Description

A function to compute the graph coordinated system with a force directed layout algorithm

Usage

frcd(net, seed = seed, maxiter, drp, scl, mov, ...)

Arguments

net	an array representing the network relations
seed	(mandatory) the seed of the initial layout (see details)
maxiter	(optional) the maximum number of iterations
drp	(optional) for valued networks, drop values less than specified
...	Additional argument items
scl	(optional and experimental) numerical scalar (x and y) or vector (x, y) of the graph's scale
mov	(optional and experimental) numerical scalar (x and y) or vector (x, y) to move the graph

Details

This function is meant as an internal routine for graph visualization. However, it can be used for the coord option both in multigraph and in bmgraph where NULL in seed implies a random seed based on the clock watch of the computer.

Value

A data frame with a coordinated system with two columns representing the abscissa and the ordinate in a two-dimensional rectangular Cartesian coordinate system.

Author(s)

Antonio Rivero Ostoic

References

Fruchterman, T.M.J., & Reingold, E.M. Graph drawing by force-directed placement. Software-Practice & Experience, 21(11), 1129-1164. 1991.

See Also

multigraph, bmgraph, stsm, conc

Examples

## Create the data: two binary relations among three elements
arr <- round( replace( array(runif(18), c(3,3,2)), array(runif(18),
       c(3,3,2))>.5, 3 ) )

## Coordinates for the force directed layout with random start
coord <- frcd(arr, seed = NULL)

## Plot multigraph with customized coordinates
multigraph(arr, coord = coord)

mplex/multigraph documentation built on April 14, 2024, 12:15 p.m.