This function will take an object of class Ragraph and will
perform a libgraph layout on the graph locations.
Usage
graphLayout(graph, layoutType=graph@layoutType)
Arguments
graph
An object of type Ragraph
layoutType
layout algorithm to use
Value
A laid out object of type Ragraph.
Details
If the graph has already been laid out, this function merely returns
its parameter. Otherwise, it will perform a libgraph layout and
retrieve the appropriate location information.