8000 bpo-33089: Multidimensional math.hypot() by rhettinger · Pull Request #8474 · python/cpython · GitHub
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bpo-33089: Multidimensional math.hypot() #8474

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Merged
merged 21 commits into from
Jul 28, 2018
Merged

bpo-33089: Multidimensional math.hypot() #8474

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ec15283
Segfaulting rough draft without NaN support or raising Overflow
rhettinger Jul 7, 2018
abce2b0
Working verion. Double pass over input tuple. No inf/nan handling.
rhettinger Jul 7, 2018
241932e
Simplify. Remove unnecessary second error check. Remove n<=1 special …
rhettinger Jul 7, 2018
51c52fc
Add some tests
rhettinger Jul 24, 2018
de3c16b
Add support for special values.
rhettinger Jul 25, 2018
18babd4
Test scaling for large values
rhettinger Jul 25, 2018
6c412d2
Add tests for small values
rhettinger Jul 26, 2018
780024b
Neaten-up test cases
rhettinger Jul 26, 2018
d82df99
Use module level constants for float min/max
rhettinger Jul 26, 2018
1a32ac7
Expand range for large value tests
rhettinger Jul 26, 2018
82a12e5
Improve variable name
rhettinger Jul 26, 2018
2d2e3aa
Replace the existing hypot() code
rhettinger Jul 26, 2018
6edd323
Clean stray whitespace
rhettinger Jul 26, 2018
9c25c65
Write the docstring
rhettinger Jul 26, 2018
c4dfbe5
Update the main documentation
rhettinger Jul 26, 2018
0734edd
Add blurb
rhettinger Jul 26, 2018
43471a9
Address Tim's review comments.
rhettinger Jul 27, 2018
3818324
Update argument clinic checksum
rhettinger Jul 27, 2018
8000 8298444
Reuse converted floats rather than converting twice
rhettinger Jul 27, 2018
d785025
Add test for a negative zero input
rhettinger Jul 28, 2018
ee1374c
Test for failed malloc(). Only test inf at the end.
rhettinger Jul 28, 2018
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Add some tests
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@rhettinger
rhettinger committed Jul 26, 2018
commit 51c52fc6e52be5643ef3312ece2269c1748040ca
23 changes: 23 additions & 0 deletions Lib/test/test_math.py
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Original file line number Diff line number Diff line change
Expand Up @@ -731,6 +731,29 @@ def testHypot(self):
self.assertTrue(math.isnan(math.hypot(1.0, NAN)))
self.assertTru 8000 e(math.isnan(math.hypot(NAN, -2.0)))

def test_multi_hypot(self):
from decimal import Decimal as D

hypot = math.mh

self.assertEqual(hypot(12.0, 5.0), 13.0) # Float inputs. Exact output.
self.assertEqual(hypot(12, 5), 13) # Int inputs
self.assertEqual(hypot(D(12), D(5)), 13) # Decimal inputs

self.assertEqual(hypot(0.0, 0.0), 0.0) # Max input is zero
self.assertEqual(hypot(-10.5), 10.5) # Negative input

with self.assertRaises(TypeError):
hypot(x=1) # Reject keyword args

# Test 0 to 4 dimensional inputs
args = math.e, math.pi, math.sqrt(2.0), math.gamma(3.5)
for i in range(len(args)+1):
self.assertAlmostEqual(
hypot(*args[:i]),
math.sqrt(sum(s**2 for s in args[:i]))
)

def testLdexp(self):
self.assertRaises(TypeError, math.ldexp)
self.ftest('ldexp(0,1)', math.ldexp(0,1), 0)
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9 changes: 6 additions & 3 deletions Modules/mathmodule.c
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Expand Up @@ -71,10 +71,13 @@ raised for division by zero and mod by zero.
Any infinity gives infinity
If no infinity, any NaN gives a NaN

hypot(x=1) -> TypeError // no keyword args
hypot(-10.5) -> 10.5 // flip the sign to positive
* hypot(x=1) -> TypeError // no keyword args
* hypot(-10.5) -> 10.5 // flip the sign to positive
hypot(-Inf) -> Inf; // flip the sign to positive
hypot() -> 0.0 // degrade like sum([])
* hypot() -> 0.0 // degrade like sum([]) or reduce(hypot, sides, 0.0)
* hypot(0) -> 0.0 // don't divide by zero
* hypot(3, 4) // ints converted to floats
* hypot(D('3.0'), D('4.0'))
*/

/* AC: cannot convert yet, waiting for *args support */
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