def comparison_matrix(self):
"""Returns Morris (1987) a cseg COM-Matrix.
>>> Contour([0, 1, 3, 2]).comparison_matrix()
| 0 1 3 2
-----------
0 | 0 + + +
1 | - 0 + +
3 | - - 0 -
2 | - - + 0
"""
size = len(self)
r_size = range(size)
m = [[a, b] for a in self for b in self]
n = [m[(i * size):((i + 1) * size)] for i in range(size)]
line = [self]
[line.append([auxiliary.comparison(x) for x in n[r]]) for r in r_size]
return matrix.ComparisonMatrix(line)
def __int_d(subset):
"""Returns a contour comparison from a given subset.
"""
a, b = subset[0], subset[-1]
return auxiliary.comparison([a, b])
