Plot trees

A learning tool for the visualization of general, directed or undirected, rooted trees.

We developed a new function for the correct visualization of general directed and undirected rooted trees. Our function Drawtree(p,pre,x) is an educational purpose function which has the following three inputs:

1) p is the vector of parent pointers in which p(r) = r implies that r is the root.
2) pre is the vector of the pre-order traversal.
3) x is a vector which describes the arc?s directions.

This work was analytically presented in: Paparrizos K., Samaras N. and Sifaleras A., «A learning tool for the visualization of general, directed or undirected rooted trees» , Proc. of the 1st International Conference on New Learning Paradigms and New Learning Tools, (New Learning 2004), 10-12 May 2004, pp. 205-213, Skiathos, Greece.