R: Choose an appropriate graph layout algorithm automatically

layout_nicely {igraph} | R Documentation

## Choose an appropriate graph layout algorithm automatically

### Description

This function tries to choose an appropriate graph layout algorithm for the graph, automatically, based on a simple algorithm. See details below.

### Usage

    layout_nicely(graph, dim = 2, ...)

    nicely(...)

### Arguments

`graph` | The input graph
`dim` | Dimensions, should be 2 or 3.
`...` | For `layout_nicely` the extra arguments are passed to the real layout function. For `nicely` all argument are passed to `layout_nicely`.

### Details

`layout_nicely` tries to choose an appropriate layout function for the supplied graph, and uses that to generate the layout. The current implementation works like this:

1. If the graph has a graph attribute called ‘layout’, then this is used. If this attribute is an R function, then it is called, with the graph and any other extra arguments.

2. Otherwise, if the graph has vertex attributes called ‘x’ and ‘y’, then these are used as coordinates. If the graph has an additional ‘z’ vertex attribute, that is also used.

3. Otherwise, if the graph is connected and has less than 1000 vertices, the Fruchterman-Reingold layout is used, by calling `layout_with_fr`.

4. Otherwise the DrL layout is used, `layout_with_drl` is called.

### Value

A numeric matrix with two or three columns.

### Author(s)

Gabor Csardi csardi.gabor@gmail.com

### See Also

`plot.igraph`

Other graph layouts: `add_layout_()`, `component_wise()`, `layout_as_bipartite()`, `layout_as_star()`, `layout_as_tree()`, `layout_in_circle()`, `layout_on_grid()`, `layout_on_sphere()`, `layout_randomly()`, `layout_with_dh()`, `layout_with_fr()`, `layout_with_gem()`, `layout_with_graphopt()`, `layout_with_kk()`, `layout_with_lgl()`, `layout_with_mds()`, `layout_with_sugiyama()`, `layout_()`, `merge_coords()`, `norm_coords()`, `normalize()`

[Package igraph version 1.2.6 Index]