332 lines
11 KiB
Python
332 lines
11 KiB
Python
from datetime import datetime, timedelta
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import numpy as np
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import pytest
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import pandas.util._test_decorators as td
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from pandas import DataFrame, Series
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import pandas._testing as tm
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class TestRank:
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s = Series([1, 3, 4, 2, np.nan, 2, 1, 5, np.nan, 3])
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df = DataFrame({"A": s, "B": s})
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results = {
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"average": np.array([1.5, 5.5, 7.0, 3.5, np.nan, 3.5, 1.5, 8.0, np.nan, 5.5]),
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"min": np.array([1, 5, 7, 3, np.nan, 3, 1, 8, np.nan, 5]),
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"max": np.array([2, 6, 7, 4, np.nan, 4, 2, 8, np.nan, 6]),
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"first": np.array([1, 5, 7, 3, np.nan, 4, 2, 8, np.nan, 6]),
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"dense": np.array([1, 3, 4, 2, np.nan, 2, 1, 5, np.nan, 3]),
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}
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@pytest.fixture(params=["average", "min", "max", "first", "dense"])
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def method(self, request):
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"""
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Fixture for trying all rank methods
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"""
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return request.param
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@td.skip_if_no_scipy
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def test_rank(self, float_frame):
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import scipy.stats # noqa:F401
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from scipy.stats import rankdata
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float_frame["A"][::2] = np.nan
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float_frame["B"][::3] = np.nan
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float_frame["C"][::4] = np.nan
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float_frame["D"][::5] = np.nan
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ranks0 = float_frame.rank()
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ranks1 = float_frame.rank(1)
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mask = np.isnan(float_frame.values)
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fvals = float_frame.fillna(np.inf).values
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exp0 = np.apply_along_axis(rankdata, 0, fvals)
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exp0[mask] = np.nan
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exp1 = np.apply_along_axis(rankdata, 1, fvals)
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exp1[mask] = np.nan
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tm.assert_almost_equal(ranks0.values, exp0)
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tm.assert_almost_equal(ranks1.values, exp1)
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# integers
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df = DataFrame(np.random.randint(0, 5, size=40).reshape((10, 4)))
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result = df.rank()
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exp = df.astype(float).rank()
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tm.assert_frame_equal(result, exp)
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result = df.rank(1)
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exp = df.astype(float).rank(1)
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tm.assert_frame_equal(result, exp)
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def test_rank2(self):
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df = DataFrame([[1, 3, 2], [1, 2, 3]])
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expected = DataFrame([[1.0, 3.0, 2.0], [1, 2, 3]]) / 3.0
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result = df.rank(1, pct=True)
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tm.assert_frame_equal(result, expected)
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df = DataFrame([[1, 3, 2], [1, 2, 3]])
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expected = df.rank(0) / 2.0
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result = df.rank(0, pct=True)
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tm.assert_frame_equal(result, expected)
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df = DataFrame([["b", "c", "a"], ["a", "c", "b"]])
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expected = DataFrame([[2.0, 3.0, 1.0], [1, 3, 2]])
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result = df.rank(1, numeric_only=False)
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tm.assert_frame_equal(result, expected)
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expected = DataFrame([[2.0, 1.5, 1.0], [1, 1.5, 2]])
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result = df.rank(0, numeric_only=False)
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tm.assert_frame_equal(result, expected)
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df = DataFrame([["b", np.nan, "a"], ["a", "c", "b"]])
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expected = DataFrame([[2.0, np.nan, 1.0], [1.0, 3.0, 2.0]])
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result = df.rank(1, numeric_only=False)
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tm.assert_frame_equal(result, expected)
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expected = DataFrame([[2.0, np.nan, 1.0], [1.0, 1.0, 2.0]])
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result = df.rank(0, numeric_only=False)
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tm.assert_frame_equal(result, expected)
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# f7u12, this does not work without extensive workaround
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data = [
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[datetime(2001, 1, 5), np.nan, datetime(2001, 1, 2)],
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[datetime(2000, 1, 2), datetime(2000, 1, 3), datetime(2000, 1, 1)],
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]
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df = DataFrame(data)
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# check the rank
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expected = DataFrame([[2.0, np.nan, 1.0], [2.0, 3.0, 1.0]])
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result = df.rank(1, numeric_only=False, ascending=True)
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tm.assert_frame_equal(result, expected)
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expected = DataFrame([[1.0, np.nan, 2.0], [2.0, 1.0, 3.0]])
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result = df.rank(1, numeric_only=False, ascending=False)
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tm.assert_frame_equal(result, expected)
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df = DataFrame({"a": [1e-20, -5, 1e-20 + 1e-40, 10, 1e60, 1e80, 1e-30]})
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exp = DataFrame({"a": [3.5, 1.0, 3.5, 5.0, 6.0, 7.0, 2.0]})
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tm.assert_frame_equal(df.rank(), exp)
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def test_rank_does_not_mutate(self):
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# GH#18521
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# Check rank does not mutate DataFrame
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df = DataFrame(np.random.randn(10, 3), dtype="float64")
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expected = df.copy()
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df.rank()
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result = df
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tm.assert_frame_equal(result, expected)
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def test_rank_mixed_frame(self, float_string_frame):
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float_string_frame["datetime"] = datetime.now()
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float_string_frame["timedelta"] = timedelta(days=1, seconds=1)
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result = float_string_frame.rank(1)
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expected = float_string_frame.rank(1, numeric_only=True)
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tm.assert_frame_equal(result, expected)
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@td.skip_if_no_scipy
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def test_rank_na_option(self, float_frame):
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import scipy.stats # noqa:F401
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from scipy.stats import rankdata
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float_frame["A"][::2] = np.nan
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float_frame["B"][::3] = np.nan
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float_frame["C"][::4] = np.nan
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float_frame["D"][::5] = np.nan
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# bottom
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ranks0 = float_frame.rank(na_option="bottom")
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ranks1 = float_frame.rank(1, na_option="bottom")
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fvals = float_frame.fillna(np.inf).values
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exp0 = np.apply_along_axis(rankdata, 0, fvals)
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exp1 = np.apply_along_axis(rankdata, 1, fvals)
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tm.assert_almost_equal(ranks0.values, exp0)
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tm.assert_almost_equal(ranks1.values, exp1)
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# top
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ranks0 = float_frame.rank(na_option="top")
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ranks1 = float_frame.rank(1, na_option="top")
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fval0 = float_frame.fillna((float_frame.min() - 1).to_dict()).values
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fval1 = float_frame.T
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fval1 = fval1.fillna((fval1.min() - 1).to_dict()).T
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fval1 = fval1.fillna(np.inf).values
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exp0 = np.apply_along_axis(rankdata, 0, fval0)
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exp1 = np.apply_along_axis(rankdata, 1, fval1)
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tm.assert_almost_equal(ranks0.values, exp0)
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tm.assert_almost_equal(ranks1.values, exp1)
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# descending
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# bottom
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ranks0 = float_frame.rank(na_option="top", ascending=False)
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ranks1 = float_frame.rank(1, na_option="top", ascending=False)
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fvals = float_frame.fillna(np.inf).values
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exp0 = np.apply_along_axis(rankdata, 0, -fvals)
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exp1 = np.apply_along_axis(rankdata, 1, -fvals)
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tm.assert_almost_equal(ranks0.values, exp0)
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tm.assert_almost_equal(ranks1.values, exp1)
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# descending
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# top
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ranks0 = float_frame.rank(na_option="bottom", ascending=False)
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ranks1 = float_frame.rank(1, na_option="bottom", ascending=False)
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fval0 = float_frame.fillna((float_frame.min() - 1).to_dict()).values
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fval1 = float_frame.T
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fval1 = fval1.fillna((fval1.min() - 1).to_dict()).T
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fval1 = fval1.fillna(np.inf).values
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exp0 = np.apply_along_axis(rankdata, 0, -fval0)
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exp1 = np.apply_along_axis(rankdata, 1, -fval1)
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tm.assert_numpy_array_equal(ranks0.values, exp0)
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tm.assert_numpy_array_equal(ranks1.values, exp1)
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# bad values throw error
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msg = "na_option must be one of 'keep', 'top', or 'bottom'"
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with pytest.raises(ValueError, match=msg):
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float_frame.rank(na_option="bad", ascending=False)
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# invalid type
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with pytest.raises(ValueError, match=msg):
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float_frame.rank(na_option=True, ascending=False)
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def test_rank_axis(self):
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# check if using axes' names gives the same result
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df = DataFrame([[2, 1], [4, 3]])
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tm.assert_frame_equal(df.rank(axis=0), df.rank(axis="index"))
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tm.assert_frame_equal(df.rank(axis=1), df.rank(axis="columns"))
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@td.skip_if_no_scipy
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def test_rank_methods_frame(self):
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import scipy.stats # noqa:F401
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from scipy.stats import rankdata
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xs = np.random.randint(0, 21, (100, 26))
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xs = (xs - 10.0) / 10.0
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cols = [chr(ord("z") - i) for i in range(xs.shape[1])]
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for vals in [xs, xs + 1e6, xs * 1e-6]:
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df = DataFrame(vals, columns=cols)
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for ax in [0, 1]:
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for m in ["average", "min", "max", "first", "dense"]:
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result = df.rank(axis=ax, method=m)
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sprank = np.apply_along_axis(
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rankdata, ax, vals, m if m != "first" else "ordinal"
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)
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sprank = sprank.astype(np.float64)
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expected = DataFrame(sprank, columns=cols).astype("float64")
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tm.assert_frame_equal(result, expected)
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@pytest.mark.parametrize("dtype", ["O", "f8", "i8"])
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def test_rank_descending(self, method, dtype):
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if "i" in dtype:
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df = self.df.dropna()
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else:
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df = self.df.astype(dtype)
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res = df.rank(ascending=False)
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expected = (df.max() - df).rank()
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tm.assert_frame_equal(res, expected)
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if method == "first" and dtype == "O":
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return
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expected = (df.max() - df).rank(method=method)
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if dtype != "O":
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res2 = df.rank(method=method, ascending=False, numeric_only=True)
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tm.assert_frame_equal(res2, expected)
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res3 = df.rank(method=method, ascending=False, numeric_only=False)
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tm.assert_frame_equal(res3, expected)
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@pytest.mark.parametrize("axis", [0, 1])
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@pytest.mark.parametrize("dtype", [None, object])
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def test_rank_2d_tie_methods(self, method, axis, dtype):
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df = self.df
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def _check2d(df, expected, method="average", axis=0):
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exp_df = DataFrame({"A": expected, "B": expected})
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if axis == 1:
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df = df.T
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exp_df = exp_df.T
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result = df.rank(method=method, axis=axis)
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tm.assert_frame_equal(result, exp_df)
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disabled = {(object, "first")}
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if (dtype, method) in disabled:
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return
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frame = df if dtype is None else df.astype(dtype)
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_check2d(frame, self.results[method], method=method, axis=axis)
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@pytest.mark.parametrize(
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"method,exp",
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[
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("dense", [[1.0, 1.0, 1.0], [1.0, 0.5, 2.0 / 3], [1.0, 0.5, 1.0 / 3]]),
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(
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"min",
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[
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[1.0 / 3, 1.0, 1.0],
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[1.0 / 3, 1.0 / 3, 2.0 / 3],
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[1.0 / 3, 1.0 / 3, 1.0 / 3],
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],
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),
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(
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"max",
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[[1.0, 1.0, 1.0], [1.0, 2.0 / 3, 2.0 / 3], [1.0, 2.0 / 3, 1.0 / 3]],
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),
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(
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"average",
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[[2.0 / 3, 1.0, 1.0], [2.0 / 3, 0.5, 2.0 / 3], [2.0 / 3, 0.5, 1.0 / 3]],
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),
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(
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"first",
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[
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[1.0 / 3, 1.0, 1.0],
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[2.0 / 3, 1.0 / 3, 2.0 / 3],
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[3.0 / 3, 2.0 / 3, 1.0 / 3],
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],
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),
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],
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)
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def test_rank_pct_true(self, method, exp):
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# see gh-15630.
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df = DataFrame([[2012, 66, 3], [2012, 65, 2], [2012, 65, 1]])
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result = df.rank(method=method, pct=True)
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expected = DataFrame(exp)
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tm.assert_frame_equal(result, expected)
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@pytest.mark.single
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@pytest.mark.high_memory
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def test_pct_max_many_rows(self):
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# GH 18271
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df = DataFrame(
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{"A": np.arange(2 ** 24 + 1), "B": np.arange(2 ** 24 + 1, 0, -1)}
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)
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result = df.rank(pct=True).max()
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assert (result == 1).all()
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