Handy Python

print_matrix

def print_matrix(mat,rvalues=None,cvalues=None):
    # print a 2d numpy array as a table, using the optional rvalues
    # and cvalues as row and column labels
    if rvalues==None:
        rvalues=np.arange(mat.shape[0])
    if cvalues==None:
        cvalues=np.arange(mat.shape[1])
    print ("{:5}"+"{:^6} "*mat.shape[1]).format('',*cvalues)
    print ("{:5}"+"{:^6} "*mat.shape[1]).format('',*["-----" for i in cvalues])
    for i,r in enumerate(rvalues):
        print ("{:4}|"+"{:^6.2f}|"*mat.shape[1]).format(r,*mat[i-1])