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from gudhi.point_cloud.timedelay import TimeDelayEmbedding
def test_normal():
# Sample array
ts = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
# Normal case.
prep = TimeDelayEmbedding()
attractor = prep(ts)
assert (attractor[0] == [1, 2, 3])
assert (attractor[1] == [2, 3, 4])
assert (attractor[2] == [3, 4, 5])
assert (attractor[3] == [4, 5, 6])
assert (attractor[4] == [5, 6, 7])
assert (attractor[5] == [6, 7, 8])
assert (attractor[6] == [7, 8, 9])
assert (attractor[7] == [8, 9, 10])
# Delay = 3
prep = TimeDelayEmbedding(delay=3)
attractor = prep(ts)
assert (attractor[0] == [1, 4, 7])
assert (attractor[1] == [2, 5, 8])
assert (attractor[2] == [3, 6, 9])
assert (attractor[3] == [4, 7, 10])
# Skip = 3
prep = TimeDelayEmbedding(skip=3)
attractor = prep(ts)
assert (attractor[0] == [1, 2, 3])
assert (attractor[1] == [4, 5, 6])
assert (attractor[2] == [7, 8, 9])
# Delay = 2 / Skip = 2
prep = TimeDelayEmbedding(delay=2, skip=2)
attractor = prep(ts)
assert (attractor[0] == [1, 3, 5])
assert (attractor[1] == [3, 5, 7])
assert (attractor[2] == [5, 7, 9])
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