qreordering {INLA} | R Documentation

## Compute the reordering using the GMRFLib implementation

### Description

This function compute the reordering (or find the best reordering) using the GMRFLib implementation

### Usage

         inla.qreordering(graph, reordering)

### Arguments

`graph` | A `(inla-)graph` object, a filename containing the graph or a matrix/Matrix defining it.
`reordering` | The type of reordering algorithm to be used; either one of the names listed in `inla.reorderings()`. The default is "auto" which try several reordering algorithm and use the best one for this particular matrix.

### Value

`inla.qreordering` returns a list with the name of the reordering algorithm used or found, the reordering code for the reordering algorithm, the actual reordering and its inverse.

### Author(s)

Havard Rue hrue@r-inla.org

### Examples

     g = system.file("demodata/germany.graph", package="INLA")
     r = inla.qreordering(g)
     m = inla.graph2matrix(g)
     r = inla.qreordering(m)
     m.file = INLA:::inla.write.fmesher.file(m)
     r = inla.qreordering(m.file)
     unlink(m.file)

[Package INLA version 18.07.12 Index]