layout_constrained_stress3D {graphlayouts}

constrained stress layout in 3D

Description

force-directed graph layout based on stress majorization with variable constrained in 3D

Usage

layout_with_constrained_stress3D(
  g,
  coord,
  fixdim = "x",
  weights = NA,
  iter = 500,
  tol = 1e-04,
  mds = TRUE,
  bbox = 30
)

Arguments

g

igraph object

coord

numeric vector. fixed coordinates for dimension specified in fixdim.

fixdim

string. which dimension should be fixed. Either "x", "y" or "z".

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

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).

This function does not come with direct support for igraph or ggraph.

Value

matrix of xyz coordinates

References

Gansner, E. R., Koren, Y., & North, S. (2004). Graph drawing by stress majorization. In International Symposium on Graph Drawing (pp. 239-250). Springer, Berlin, Heidelberg.

See Also

layout_constrained_stress