# layout.drl

From igraph v0.5.5-3
by Gabor Csardi

##### The DrL graph layout generator

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.

- Keywords
- graphs

##### Usage

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

##### Arguments

- 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`F`

- dim
- Either
2 or3 , it specifies whether we want a two dimensional or a three dimensional layout. Note that because of the nature of the DrL algorithm, the three dimensional layout takes significantly longer to com

##### Details

This function implements the force-directed DrL layout generator.

The generator has the following parameters:

- edge.cut

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`

.

##### Value

- A numeric matrix with two columns.

##### concept

Graph layout

##### References

##### See Also

`layout`

for other layout generators.

##### Examples

```
g <- as.undirected(ba.game(100, m=1))
l <- layout.drl(g, options=list(simmer.attraction=0))
plot(g, layout=l, vertex.size=3, vertex.label=NA)
```

*Documentation reproduced from package igraph, version 0.5.5-3, License: GPL (>= 2)*

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