def interval_succession(self):
"""Return Friedmann (1985) CIS, a series which indicates the
order of Contour Intervals in a given CC (normal form cseg
here)."""
subsets = self.subsets_adj(2)
return [auxiliary.interval([x[0], x[-1]]) for x in subsets]
def interval_array(self):
"""Return Friedmann (1985) CIA, an ordered series of numbers
that indicates the multiplicity of each Contour Interval type
in a given CC (normal form cseg here). For cseg < 0 1 3 2 >,
there are 2 instances of type +1 CI, 2 type +2 CI, 1. CIA =
([2, 2, 1], [1, 0, 0])
'up_intervals' and 'down_intervals' store the contour intervals
that the method counts.
The loop appends positive elements in ups_list and negative in
downs_list.
'ups' and 'downs' stores contour intervals counting for all
types of positive and negative intervals in the cseg.
>>> Contour([0, 1, 3, 2]).interval_array()
([2, 2, 1], [1, 0, 0])
"""
up_intervals = range(1, len(self))
down_intervals = [-x for x in up_intervals]
ups_list = []
downs_list = []
for x in itertools.combinations(self, 2):
y = auxiliary.interval(x)
if y > 0:
ups_list.append(y)
elif y < 0:
downs_list.append(y)
ups = [ups_list.count(x) for x in up_intervals]
downs = [downs_list.count(x) for x in down_intervals]
return ups, downs
def test_interval(self):
self.assertEqual(auxiliary.interval([4, 0]), -4)
