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import unittest
import gudhi
"""This file is part of the Gudhi Library. The Gudhi library
(Geometric Understanding in Higher Dimensions) is a generic C++
library for computational topology.
Author(s): Vincent Rouvreau
Copyright (C) 2016 INRIA
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
__author__ = "Vincent Rouvreau"
__copyright__ = "Copyright (C) 2016 INRIA"
__license__ = "GPL v3"
class TestAlphaComplex(unittest.TestCase):
def test_infinite_alpha(self):
point_list = [[0, 0], [1, 0], [0, 1], [1, 1]]
alpha_complex = gudhi.AlphaComplex(points=point_list)
self.assertEqual(alpha_complex.num_simplices(), 11)
self.assertEqual(alpha_complex.num_vertices(), 4)
self.assertEqual(alpha_complex.get_filtered_tree(),
[([0], 0.0), ([1], 0.0), ([2], 0.0), ([3], 0.0),
([0, 1], 0.25), ([0, 2], 0.25), ([1, 3], 0.25),
([2, 3], 0.25), ([1, 2], 0.5), ([0, 1, 2], 0.5),
([1, 2, 3], 0.5)])
self.assertEqual(alpha_complex.get_star_tree([0]),
[([0], 0.0), ([0, 1], 0.25), ([0, 1, 2], 0.5),
([0, 2], 0.25)])
self.assertEqual(alpha_complex.get_coface_tree([0], 1),
[([0, 1], 0.25), ([0, 2], 0.25)])
self.assertEqual(point_list[0], alpha_complex.get_point(0))
self.assertEqual(point_list[1], alpha_complex.get_point(1))
self.assertEqual(point_list[2], alpha_complex.get_point(2))
self.assertEqual(point_list[3], alpha_complex.get_point(3))
self.assertEqual([], alpha_complex.get_point(4))
self.assertEqual([], alpha_complex.get_point(125))
def test_filtered_alpha(self):
point_list = [[0, 0], [1, 0], [0, 1], [1, 1]]
filtered_alpha = gudhi.AlphaComplex(points=point_list,
max_alpha_square=0.25)
self.assertEqual(filtered_alpha.num_simplices(), 8)
self.assertEqual(filtered_alpha.num_vertices(), 4)
self.assertEqual(point_list[0], filtered_alpha.get_point(0))
self.assertEqual(point_list[1], filtered_alpha.get_point(1))
self.assertEqual(point_list[2], filtered_alpha.get_point(2))
self.assertEqual(point_list[3], filtered_alpha.get_point(3))
self.assertEqual([], filtered_alpha.get_point(4))
self.assertEqual([], filtered_alpha.get_point(125))
self.assertEqual(filtered_alpha.get_filtered_tree(),
[([0], 0.0), ([1], 0.0), ([2], 0.0), ([3], 0.0),
([0, 1], 0.25), ([0, 2], 0.25), ([1, 3], 0.25),
([2, 3], 0.25)])
self.assertEqual(filtered_alpha.get_star_tree([0]),
[([0], 0.0), ([0, 1], 0.25), ([0, 2], 0.25)])
self.assertEqual(filtered_alpha.get_coface_tree([0], 1),
[([0, 1], 0.25), ([0, 2], 0.25)])
if __name__ == '__main__':
unittest.main()
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