Produce a plot of matlab DTree data and return the object

If an output dir and filename are provided, a plot will be saved, otherwise the function will just return the graph. This is used for internal analysis to compare with matlab implementation.

PlotMatlabDtree(edge_table, predecessors, outputdir = NULL, outputfile = NULL)

Arguments

edge_table	a numeric matrix whose rows are directed edges of a tree: col 1 is v1, col2 is v2, col3 is weight
predecessors	a vector of tree predecessors such that pred[i] = the predecessor of i
outputdir	the output directory, relative to getwd()
outputfile	the output file

Value

an igraph representation of the tree