# layout_with_gem

0th

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##### The GEM layout algorithm

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

Keywords
graphs
##### 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.

##### 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()

##### Aliases
• layout_with_gem
• layout.gem
• with_gem
##### Examples
# NOT RUN {
set.seed(42)
g <- make_ring(10)
plot(g, layout=layout_with_gem)

# }

Documentation reproduced from package igraph, version 1.2.6, License: GPL (>= 2)

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