R igraph manual pages

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The GEM layout algorithm

Description

Place vertices on the plane using the GEM force-directed layout algorithm.

Usage

```layout_with_gem(graph, coords = NULL, maxiter = 40 * vcount(graph)^2,
temp.max = vcount(graph), temp.min = 1/10,
temp.init = sqrt(vcount(graph)))

with_gem(...)
```

Arguments

 `graph` The input graph. Edge directions are ignored. `coords` If not `NULL`, then the starting coordinates should be given here, in a two or three column matrix, depending on the `dim` argument. `maxiter` The maximum number of iterations to perform. Updating a single vertex counts as an iteration. A reasonable default is 40 * n * n, where n is the number of vertices. The original paper suggests 4 * n * n, but this usually only works if the other parameters are set up carefully. `temp.max` The maximum allowed local temperature. A reasonable default is the number of vertices. `temp.min` The global temperature at which the algorithm terminates (even before reaching `maxiter` iterations). A reasonable default is 1/10. `temp.init` Initial local temperature of all vertices. A reasonable default is the square root of the number of vertices. `...` Passed to `layout_with_gem`.

Details

See the referenced paper below for the details of the algorithm.

Value

A numeric matrix with two columns, and as many rows as the number of vertices.

Author(s)

Gabor Csardi csardi.gabor@gmail.com

References

Arne Frick, Andreas Ludwig, Heiko Mehldau: A Fast Adaptive Layout Algorithm for Undirected Graphs, Proc. Graph Drawing 1994, LNCS 894, pp. 388-403, 1995.

`layout_with_fr`, `plot.igraph`, `tkplot`

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

Examples

```
set.seed(42)
g <- make_ring(10)
plot(g, layout=layout_with_gem)

```

[Package igraph version 1.2.4.1 Index]