import operator
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import numpy as np
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import pytest
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from pandas import (
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DataFrame,
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Series,
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)
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import pandas._testing as tm
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class TestMatmul:
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def test_matmul(self):
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# matmul test is for GH#10259
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a = Series(np.random.randn(4), index=["p", "q", "r", "s"])
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b = DataFrame(
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np.random.randn(3, 4), index=["1", "2", "3"], columns=["p", "q", "r", "s"]
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).T
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# Series @ DataFrame -> Series
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result = operator.matmul(a, b)
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expected = Series(np.dot(a.values, b.values), index=["1", "2", "3"])
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tm.assert_series_equal(result, expected)
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# DataFrame @ Series -> Series
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result = operator.matmul(b.T, a)
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expected = Series(np.dot(b.T.values, a.T.values), index=["1", "2", "3"])
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tm.assert_series_equal(result, expected)
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# Series @ Series -> scalar
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result = operator.matmul(a, a)
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expected = np.dot(a.values, a.values)
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tm.assert_almost_equal(result, expected)
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# GH#21530
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# vector (1D np.array) @ Series (__rmatmul__)
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result = operator.matmul(a.values, a)
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expected = np.dot(a.values, a.values)
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tm.assert_almost_equal(result, expected)
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# GH#21530
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# vector (1D list) @ Series (__rmatmul__)
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result = operator.matmul(a.values.tolist(), a)
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expected = np.dot(a.values, a.values)
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tm.assert_almost_equal(result, expected)
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# GH#21530
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# matrix (2D np.array) @ Series (__rmatmul__)
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result = operator.matmul(b.T.values, a)
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expected = np.dot(b.T.values, a.values)
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tm.assert_almost_equal(result, expected)
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# GH#21530
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# matrix (2D nested lists) @ Series (__rmatmul__)
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result = operator.matmul(b.T.values.tolist(), a)
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expected = np.dot(b.T.values, a.values)
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tm.assert_almost_equal(result, expected)
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# mixed dtype DataFrame @ Series
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a["p"] = int(a.p)
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result = operator.matmul(b.T, a)
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expected = Series(np.dot(b.T.values, a.T.values), index=["1", "2", "3"])
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tm.assert_series_equal(result, expected)
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# different dtypes DataFrame @ Series
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a = a.astype(int)
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result = operator.matmul(b.T, a)
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expected = Series(np.dot(b.T.values, a.T.values), index=["1", "2", "3"])
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tm.assert_series_equal(result, expected)
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msg = r"Dot product shape mismatch, \(4,\) vs \(3,\)"
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# exception raised is of type Exception
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with pytest.raises(Exception, match=msg):
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a.dot(a.values[:3])
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msg = "matrices are not aligned"
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with pytest.raises(ValueError, match=msg):
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a.dot(b.T)
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