layout_fixed_coords: Layout with fixed coordinates

In graphlayouts: Additional Layout Algorithms for Network Visualizations

Layout with fixed coordinates

Description

force-directed graph layout based on stress majorization with fixed coordinates for some nodes

Usage

layout_with_fixed_coords(
  g,
  coords,
  weights = NA,
  iter = 500,
  tol = 1e-04,
  mds = TRUE,
  bbox = 30
)

layout_igraph_fixed_coords(
  g,
  coords,
  weights = NA,
  iter = 500,
  tol = 1e-04,
  mds = TRUE,
  bbox = 30,
  circular
)

Arguments

g	igraph object
coords	numeric n x 2 matrix, where n is the number of nodes. values are either NA or fixed coordinates. coordinates are only calculated for the NA values.
weights	possibly a numeric vector with edge weights. If this is NULL and the graph has a weight edge attribute, then the attribute is used. If this is NA then no weights are used (even if the graph has a weight attribute). By default, weights are ignored. See details for more.
iter	number of iterations during stress optimization
tol	stopping criterion for stress optimization
mds	should an MDS layout be used as initial layout (default: TRUE)
bbox	constrain dimension of output. Only relevant to determine the placement of disconnected graphs
circular	not used

Details

Be careful when using weights. In most cases, the inverse of the edge weights should be used to ensure that the endpoints of an edges with higher weights are closer together (weights=1/E(g)$weight).

The layout_igraph_* function should not be used directly. It is only used as an argument for plotting with 'igraph'. 'ggraph' natively supports the layout.

Value

matrix of xy coordinates

See Also

layout_constrained_stress

Examples

library(igraph)
set.seed(12)
g <- sample_bipartite(10, 5, "gnp", 0.5)
fxy <- cbind(c(rep(0, 10), rep(1, 5)), NA)
xy <- layout_with_fixed_coords(g, fxy)

graphlayouts documentation built on Sept. 30, 2024, 9:22 a.m.