def test_minmax_period(self):
# monotonic
idx1 = PeriodIndex([NaT, "2011-01-01", "2011-01-02", "2011-01-03"],
freq="D")
assert not idx1.is_monotonic
assert idx1[1:].is_monotonic
# non-monotonic
idx2 = PeriodIndex(
["2011-01-01", NaT, "2011-01-03", "2011-01-02", NaT], freq="D")
assert not idx2.is_monotonic
for idx in [idx1, idx2]:
assert idx.min() == Period("2011-01-01", freq="D")
assert idx.max() == Period("2011-01-03", freq="D")
assert idx1.argmin() == 1
assert idx2.argmin() == 0
assert idx1.argmax() == 3
assert idx2.argmax() == 2
for op in ["min", "max"]:
# Return NaT
obj = PeriodIndex([], freq="M")
result = getattr(obj, op)()
assert result is NaT
obj = PeriodIndex([NaT], freq="M")
result = getattr(obj, op)()
assert result is NaT
obj = PeriodIndex([NaT, NaT, NaT], freq="M")
result = getattr(obj, op)()
assert result is NaT
def test_minmax_period(self):
# monotonic
idx1 = PeriodIndex([NaT, "2011-01-01", "2011-01-02", "2011-01-03"], freq="D")
assert not idx1.is_monotonic_increasing
assert idx1[1:].is_monotonic_increasing
# non-monotonic
idx2 = PeriodIndex(
["2011-01-01", NaT, "2011-01-03", "2011-01-02", NaT], freq="D"
)
assert not idx2.is_monotonic_increasing
for idx in [idx1, idx2]:
assert idx.min() == Period("2011-01-01", freq="D")
assert idx.max() == Period("2011-01-03", freq="D")
assert idx1.argmin() == 1
assert idx2.argmin() == 0
assert idx1.argmax() == 3
assert idx2.argmax() == 2