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Kirill Smelkov
cpython
Commits
be64d951
Commit
be64d951
authored
Jul 07, 2010
by
Mark Dickinson
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Issue #9186: log1p(-1.0) should raise ValueError, not OverflowError.
parent
9c91eb84
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9 deletions
+75
-9
Lib/test/math_testcases.txt
Lib/test/math_testcases.txt
+72
-0
Lib/test/test_math.py
Lib/test/test_math.py
+0
-8
Misc/NEWS
Misc/NEWS
+2
-0
Modules/mathmodule.c
Modules/mathmodule.c
+1
-1
No files found.
Lib/test/math_testcases.txt
View file @
be64d951
...
...
@@ -370,6 +370,78 @@ gam0140 gamma -63.349078729022985 -> 4.1777971677761880e-88
gam0141 gamma -127.45117632943295 -> 1.1831110896236810e-214
-----------------------------------------------------------
-- log1p: log(1 + x), without precision loss for small x --
-----------------------------------------------------------
-- special values
log1p0000 log1p 0.0 -> 0.0
log1p0001 log1p -0.0 -> -0.0
log1p0002 log1p inf -> inf
log1p0003 log1p -inf -> nan invalid
log1p0004 log1p nan -> nan
-- singularity at -1.0
log1p0010 log1p -1.0 -> -inf divide-by-zero
log1p0011 log1p -0.9999999999999999 -> -36.736800569677101
-- finite values < 1.0 are invalid
log1p0020 log1p -1.0000000000000002 -> nan invalid
log1p0021 log1p -1.1 -> nan invalid
log1p0022 log1p -2.0 -> nan invalid
log1p0023 log1p -1e300 -> nan invalid
-- tiny x: log1p(x) ~ x
log1p0110 log1p 5e-324 -> 5e-324
log1p0111 log1p 1e-320 -> 1e-320
log1p0112 log1p 1e-300 -> 1e-300
log1p0113 log1p 1e-150 -> 1e-150
log1p0114 log1p 1e-20 -> 1e-20
log1p0120 log1p -5e-324 -> -5e-324
log1p0121 log1p -1e-320 -> -1e-320
log1p0122 log1p -1e-300 -> -1e-300
log1p0123 log1p -1e-150 -> -1e-150
log1p0124 log1p -1e-20 -> -1e-20
-- some (mostly) random small and moderate-sized values
log1p0200 log1p -0.89156889782277482 -> -2.2216403106762863
log1p0201 log1p -0.23858496047770464 -> -0.27257668276980057
log1p0202 log1p -0.011641726191307515 -> -0.011710021654495657
log1p0203 log1p -0.0090126398571693817 -> -0.0090534993825007650
log1p0204 log1p -0.00023442805985712781 -> -0.00023445554240995693
log1p0205 log1p -1.5672870980936349e-5 -> -1.5672993801662046e-5
log1p0206 log1p -7.9650013274825295e-6 -> -7.9650330482740401e-6
log1p0207 log1p -2.5202948343227410e-7 -> -2.5202951519170971e-7
log1p0208 log1p -8.2446372820745855e-11 -> -8.2446372824144559e-11
log1p0209 log1p -8.1663670046490789e-12 -> -8.1663670046824230e-12
log1p0210 log1p 7.0351735084656292e-18 -> 7.0351735084656292e-18
log1p0211 log1p 5.2732161907375226e-12 -> 5.2732161907236188e-12
log1p0212 log1p 1.0000000000000000e-10 -> 9.9999999995000007e-11
log1p0213 log1p 2.1401273266000197e-9 -> 2.1401273243099470e-9
log1p0214 log1p 1.2668914653979560e-8 -> 1.2668914573728861e-8
log1p0215 log1p 1.6250007816299069e-6 -> 1.6249994613175672e-6
log1p0216 log1p 8.3740495645839399e-6 -> 8.3740145024266269e-6
log1p0217 log1p 3.0000000000000001e-5 -> 2.9999550008999799e-5
log1p0218 log1p 0.0070000000000000001 -> 0.0069756137364252423
log1p0219 log1p 0.013026235315053002 -> 0.012942123564008787
log1p0220 log1p 0.013497160797236184 -> 0.013406885521915038
log1p0221 log1p 0.027625599078135284 -> 0.027250897463483054
log1p0222 log1p 0.14179687245544870 -> 0.13260322540908789
-- large values
log1p0300 log1p 1.7976931348623157e+308 -> 709.78271289338397
log1p0301 log1p 1.0000000000000001e+300 -> 690.77552789821368
log1p0302 log1p 1.0000000000000001e+70 -> 161.18095650958321
log1p0303 log1p 10000000000.000000 -> 23.025850930040455
-- other values transferred from testLog1p in test_math
log1p0400 log1p -0.63212055882855767 -> -1.0000000000000000
log1p0401 log1p 1.7182818284590451 -> 1.0000000000000000
log1p0402 log1p 1.0000000000000000 -> 0.69314718055994529
log1p0403 log1p 1.2379400392853803e+27 -> 62.383246250395075
-----------------------------------------------------------
-- expm1: exp(x) - 1, without precision loss for small x --
-----------------------------------------------------------
...
...
Lib/test/test_math.py
View file @
be64d951
...
...
@@ -647,15 +647,7 @@ class MathTests(unittest.TestCase):
def
testLog1p
(
self
):
self
.
assertRaises
(
TypeError
,
math
.
log1p
)
self
.
ftest
(
'log1p(1/e -1)'
,
math
.
log1p
(
1
/
math
.
e
-
1
),
-
1
)
self
.
ftest
(
'log1p(0)'
,
math
.
log1p
(
0
),
0
)
self
.
ftest
(
'log1p(e-1)'
,
math
.
log1p
(
math
.
e
-
1
),
1
)
self
.
ftest
(
'log1p(1)'
,
math
.
log1p
(
1
),
math
.
log
(
2
))
self
.
assertEquals
(
math
.
log1p
(
INF
),
INF
)
self
.
assertRaises
(
ValueError
,
math
.
log1p
,
NINF
)
self
.
assertTrue
(
math
.
isnan
(
math
.
log1p
(
NAN
)))
n
=
2
**
90
self
.
assertAlmostEquals
(
math
.
log1p
(
n
),
62.383246250395075
)
self
.
assertAlmostEquals
(
math
.
log1p
(
n
),
math
.
log1p
(
float
(
n
)))
def
testLog10
(
self
):
...
...
Misc/NEWS
View file @
be64d951
...
...
@@ -468,6 +468,8 @@ C-API
Library
-------
- Issue #9186: Fix math.log1p(-1.0) to raise ValueError, not OverflowError.
- Issue #9130: Fix validation of relative imports in parser module.
- Issue #9128: Fix validation of class decorators in parser module.
...
...
Modules/mathmodule.c
View file @
be64d951
...
...
@@ -896,7 +896,7 @@ FUNC1A(gamma, m_tgamma,
"gamma(x)
\n\n
Gamma function at x."
)
FUNC1A
(
lgamma
,
m_lgamma
,
"lgamma(x)
\n\n
Natural logarithm of absolute value of Gamma function at x."
)
FUNC1
(
log1p
,
m_log1p
,
1
,
FUNC1
(
log1p
,
m_log1p
,
0
,
"log1p(x)
\n\n
Return the natural logarithm of 1+x (base e).
\n
"
"The result is computed in a way which is accurate for x near zero."
)
FUNC1
(
sin
,
sin
,
0
,
...
...
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