Building phylogenetic tree from distance matrix

Scripts for building phylogenetic trees from a given distance matrix with neighbor joining method.
In /references/phylogenetic_tree.pdf you can find information about phylogenetic trees and neighbor joining method and see some examples of computing phylogenetic trees.

Example:

Input:

Distance Matrix

 [   A  B  C  D  E  F ]
 [ A 00 00 00 00 00 00]
 [ B 05 00 00 00 00 00]
 [ C 04 07 00 00 00 00]
 [ D 07 10 07 00 00 00]
 [ E 06 09 06 05 00 00]
 [ F 08 11 08 09 08 00]

Outputs

1. Newick Format:

 [ [[['E',2], ['D',3]], [ ['C',2], [['B',4], ['A',1]]]], ['F',5] ]

2. Phylogenetic Tree: