layout.drl {igraph} | R Documentation |

DrL is a force-directed graph layout toolbox focused on real-world large-scale graphs, developed by Shawn Martin and colleagues at Sandia National Laboratories.

layout.drl (graph, use.seed = FALSE, seed = matrix(runif(vcount(graph) * 2), nc = 2), options = igraph.drl.default, weights = E(graph)$weight, fixed = NULL)

`graph` |
The input graph, in can be directed or undirected. |

`use.seed` |
Logical scalar, whether to use the coordinates given
in the `seed` argument as a starting point. |

`seed` |
A matrix with two columns, the starting coordinates for
the vertices is `use.seed` is `TRUE` . It is ignored
otherwise. |

`options` |
Options for the layout generator, a named list. See details below. |

`weights` |
Optional edge weights. Supply `NULL` here if you
want to weight edges equally. By default the `weight` edge
attribute is used if the graph has one. |

`fixed` |
Logical vector, it can be used to fix some vertices. All
vertices for which it is `TRUE` are kept at the coordinates
supplied in the `seed` matrix. It is ignored it `NULL` or
if `use.seed` is `FALSE` . |

This function implements the force-directed DrL layout generator.

The generator has the following parameters:

- edge.cut
- Edge cutting is done in the late stages of the algorithm in order to achieve less dense layouts. Edges are cut if there is a lot of stress on them (a large value in the objective function sum). The edge cutting parameter is a value between 0 and 1 with 0 representing no edge cutting and 1 representing maximal edge cutting.
- init.iterations
- Number of iterations in the first phase.
- init.temperature
- Start temperature, first phase.
- init.attraction
- Attraction, first phase.
- init.damping.mult
- Damping, first phase.
- liquid.iterations
- Number of iterations, liquid phase.
- liquid.temperature
- Start temperature, liquid phase.
- liquid.attraction
- Attraction, liquid phase.
- liquid.damping.mult
- Damping, liquid phase.
- expansion.iterations
- Number of iterations, expansion phase.
- expansion.temperature
- Start temperature, expansion phase.
- expansion.attraction
- Attraction, expansion phase.
- expansion.damping.mult
- Damping, expansion phase.
- cooldown.iterations
- Number of iterations, cooldown phase.
- cooldown.temperature
- Start temperature, cooldown phase.
- cooldown.attraction
- Attraction, cooldown phase.
- cooldown.damping.mult
- Damping, cooldown phase.
- crunch.iterations
- Number of iterations, crunch phase.
- crunch.temperature
- Start temperature, crunch phase.
- crunch.attraction
- Attraction, crunch phase.
- crunch.damping.mult
- Damping, crunch phase.
- simmer.iterations
- Number of iterations, simmer phase.
- simmer.temperature
- Start temperature, simmer phase.
- simmer.attraction
- Attraction, simmer phase.
- simmer.damping.mult
- Damping, simmer phase.

There are five pre-defined parameter settings as well, these are
called `igraph.drl.default`

, `igraph.drl.coarsen`

,
`igraph.drl.coarsest`

, `igraph.drl.refine`

and
`igraph.drl.final`

.

A numeric matrix with two columns.

Shawn Martin google@for.it and Gabor Csardi csardi@rmki.kfki.hu for the R/igraph interface

http://www.cs.sandia.gov/~smartin/software.html

`layout`

for other layout generators.

g <- as.undirected(ba.game(100, m=1)) l <- layout.drl(g, options=list(simmer.attraction=0)) ## Not run: plot(g, layout=l, vertex.size=3, vertex.label=NA) ## End(Not run)

[Package *igraph* version 0.5.1 Index]