Compete the program below to read in a distance matrix from 
a file into a two dimensional matrix D

#####BEGIN CODE######

def readdata(filename, D):

    return D

####Main####

D = []
readdata("distance_matrix.txt", D)

#####END CODE######

The distance matrix is provided in a text file called
distance_matrix.txt. For example,

0 3 8 8 
3 0 9 9
8 9 0 4
8 9 4 0

Submit hardcopy in class on Mar 26th, 2012.
----------------

Construct the UPGMA tree with the algorithm covered in class
for the matrix below 

  A  B   C   D   E
A    4   7   8   10
B        7   8   10
C            3   5
D                4
E                

Submit a hardcopy on Mar 26th in class.