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| author | Mark Dickinson <dickinsm@gmail.com> | 2008-04-20 20:38:48 (GMT) |
|---|---|---|
| committer | Mark Dickinson <dickinsm@gmail.com> | 2008-04-20 20:38:48 (GMT) |
| commit | d6d5148b44cfd6472a3ff319b15f8c3f9953bba5 (patch) | |
| tree | 2dc6c80c8d82cbeacb0d547f9a8e07fa5dff64a7 | |
| parent | c632301bd4ddbd1207f4c737c925411916faf8c0 (diff) | |
| download | cpython-d6d5148b44cfd6472a3ff319b15f8c3f9953bba5.zip cpython-d6d5148b44cfd6472a3ff319b15f8c3f9953bba5.tar.gz cpython-d6d5148b44cfd6472a3ff319b15f8c3f9953bba5.tar.bz2 | |
Add test for tanh(-0.) == -0. on IEEE 754 systems
| -rw-r--r-- | Lib/test/test_math.py | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/Lib/test/test_math.py b/Lib/test/test_math.py index 7d6ce4a..c9eade3 100644 --- a/Lib/test/test_math.py +++ b/Lib/test/test_math.py @@ -124,6 +124,59 @@ class MathTests(unittest.TestCase): self.ftest('atan2(1, 1)', math.atan2(1, 1), math.pi/4) self.ftest('atan2(1, 0)', math.atan2(1, 0), math.pi/2) + # math.atan2(0, x) + self.ftest('atan2(0., -inf)', math.atan2(0., NINF), math.pi) + self.ftest('atan2(0., -2.3)', math.atan2(0., -2.3), math.pi) + self.ftest('atan2(0., -0.)', math.atan2(0., -0.), math.pi) + self.assertEqual(math.atan2(0., 0.), 0.) + self.assertEqual(math.atan2(0., 2.3), 0.) + self.assertEqual(math.atan2(0., INF), 0.) + self.assert_(math.isnan(math.atan2(0., NAN))) + # math.atan2(-0, x) + self.ftest('atan2(-0., -inf)', math.atan2(-0., NINF), -math.pi) + self.ftest('atan2(-0., -2.3)', math.atan2(-0., -2.3), -math.pi) + self.ftest('atan2(-0., -0.)', math.atan2(-0., -0.), -math.pi) + self.assertEqual(math.atan2(-0., 0.), -0.) + self.assertEqual(math.atan2(-0., 2.3), -0.) + self.assertEqual(math.atan2(-0., INF), -0.) + self.assert_(math.isnan(math.atan2(-0., NAN))) + # math.atan2(INF, x) + self.ftest('atan2(inf, -inf)', math.atan2(INF, NINF), math.pi*3/4) + self.ftest('atan2(inf, -2.3)', math.atan2(INF, -2.3), math.pi/2) + self.ftest('atan2(inf, -0.)', math.atan2(INF, -0.0), math.pi/2) + self.ftest('atan2(inf, 0.)', math.atan2(INF, 0.0), math.pi/2) + self.ftest('atan2(inf, 2.3)', math.atan2(INF, 2.3), math.pi/2) + self.ftest('atan2(inf, inf)', math.atan2(INF, INF), math.pi/4) + self.assert_(math.isnan(math.atan2(INF, NAN))) + # math.atan2(NINF, x) + self.ftest('atan2(-inf, -inf)', math.atan2(NINF, NINF), -math.pi*3/4) + self.ftest('atan2(-inf, -2.3)', math.atan2(NINF, -2.3), -math.pi/2) + self.ftest('atan2(-inf, -0.)', math.atan2(NINF, -0.0), -math.pi/2) + self.ftest('atan2(-inf, 0.)', math.atan2(NINF, 0.0), -math.pi/2) + self.ftest('atan2(-inf, 2.3)', math.atan2(NINF, 2.3), -math.pi/2) + self.ftest('atan2(-inf, inf)', math.atan2(NINF, INF), -math.pi/4) + self.assert_(math.isnan(math.atan2(NINF, NAN))) + # math.atan2(+finite, x) + self.ftest('atan2(2.3, -inf)', math.atan2(2.3, NINF), math.pi) + self.ftest('atan2(2.3, -0.)', math.atan2(2.3, -0.), math.pi/2) + self.ftest('atan2(2.3, 0.)', math.atan2(2.3, 0.), math.pi/2) + self.assertEqual(math.atan2(2.3, INF), 0.) + self.assert_(math.isnan(math.atan2(2.3, NAN))) + # math.atan2(-finite, x) + self.ftest('atan2(-2.3, -inf)', math.atan2(-2.3, NINF), -math.pi) + self.ftest('atan2(-2.3, -0.)', math.atan2(-2.3, -0.), -math.pi/2) + self.ftest('atan2(-2.3, 0.)', math.atan2(-2.3, 0.), -math.pi/2) + self.assertEqual(math.atan2(-2.3, INF), -0.) + self.assert_(math.isnan(math.atan2(-2.3, NAN))) + # math.atan2(NAN, x) + self.assert_(math.isnan(math.atan2(NAN, NINF))) + self.assert_(math.isnan(math.atan2(NAN, -2.3))) + self.assert_(math.isnan(math.atan2(NAN, -0.))) + self.assert_(math.isnan(math.atan2(NAN, 0.))) + self.assert_(math.isnan(math.atan2(NAN, 2.3))) + self.assert_(math.isnan(math.atan2(NAN, INF))) + self.assert_(math.isnan(math.atan2(NAN, NAN))) + def testCeil(self): self.assertRaises(TypeError, math.ceil) # These types will be int in py3k. @@ -579,6 +632,11 @@ class MathTests(unittest.TestCase): self.ftest('tanh(inf)', math.tanh(INF), 1) self.ftest('tanh(-inf)', math.tanh(NINF), -1) self.assert_(math.isnan(math.tanh(NAN))) + # check that tanh(-0.) == -0. on IEEE 754 systems + if float.__getformat__("double").startswith("IEEE"): + self.assertEqual(math.tanh(-0.), -0.) + self.assertEqual(math.copysign(1., math.tanh(-0.)), + math.copysign(1., -0.)) def test_trunc(self): self.assertEqual(math.trunc(1), 1) |