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.

See Also

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]