def test_detrend_linear(self):
n = 100
x = np.random.randn(n)
dtx = detrend_linear(x)
eps = np.finfo(dtx.dtype).eps
ord_mag = int(np.floor(np.log10(n)))
rtol = 10.0 ** (1 - ord_mag) + (ord_mag - 1)
assert_allclose(dtx.mean(), 0.0, rtol=rtol, atol=eps)
assert_allclose(dtx.std(), 1.0, rtol=rtol, atol=eps)
def test_detrend_linear_series(self):
n = 5
x = Series(np.random.randn(n))
dtx = detrend_linear(x)
m = dtx.mean()
s = dtx.std()
ord_mag = int(np.floor(np.log10(n)))
rtol = 10 ** (1 - ord_mag) + (ord_mag - 1)
eps = np.finfo(float).eps * 10
assert_allclose(m, 0.0, rtol=rtol, atol=eps)
assert_allclose(s, 1.0, rtol=rtol, atol=eps)
