R: stress majorization graph layout

layout_stress {graphlayouts} | R Documentation

## stress majorization graph layout

### Description

force-directed graph layout based on stress majorization.

### Usage

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

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

### Arguments

`g` | igraph object
`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

### 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.

### Examples

    library(igraph)
    library(ggraph)
    set.seed(665)

    g <- sample_pa(100,1,1,directed = FALSE)

    # calculate layout manualy
    xy <- layout_with_stress(g)

    # use it with ggraph
    ## Not run:
    ggraph(g,layout = "stress")+
      geom_edge_link0(edge_width = 0.2,colour = "grey")+
      geom_node_point(col = "black",size = 0.3)+
      theme_graph()

    ## End(Not run)

[Package graphlayouts version 0.5.0 Index]