test_extras.py 文件源码

def test_ddof(self):
        # ddof raises DeprecationWarning
        x, y = self.data, self.data2
        expected = np.corrcoef(x)
        expected2 = np.corrcoef(x, y)
        with catch_warn_mae():
            warnings.simplefilter("always")
            assert_warns(DeprecationWarning, corrcoef, x, ddof=-1)
            warnings.simplefilter("ignore")
            # ddof has no or negligible effect on the function
            assert_almost_equal(np.corrcoef(x, ddof=0), corrcoef(x, ddof=0))
            assert_almost_equal(corrcoef(x, ddof=-1), expected)
            assert_almost_equal(corrcoef(x, y, ddof=-1), expected2)
            assert_almost_equal(corrcoef(x, ddof=3), expected)
            assert_almost_equal(corrcoef(x, y, ddof=3), expected2)