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"body": "<div id=\"comment:0\"></div>\n\nThere seems to be no reason to use the `long double` functions like `sage_logl` for Pynac. It interacts only with Python objects and Python's `float` corresponds to `double` in C.\n\nCC: @rwst @embray\n\nComponent: **cython**\n\nAuthor: **Jeroen Demeyer**\n\nBranch/Commit: **[`20cdb45`](https://github.com/sagemath/sagetrac-mirror/commit/20cdb45b4e0bc33f9fd746959e50754caf036835)**\n\nReviewer: **Erik Bray, Ralf Stephan**\n\n_Issue created by migration from https://trac.sagemath.org/ticket/20531_\n\n",
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}There seems to be no reason to use the long double functions like sage_logl for Pynac. It interacts only with Python objects and Python's float corresponds to double in C.
CC: @rwst @embray
Component: cython
Author: Jeroen Demeyer
Branch/Commit: 20cdb45
Reviewer: Erik Bray, Ralf Stephan
Issue created by migration from https://trac.sagemath.org/ticket/20531
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"body": "<div id=\"comment:2\"></div>\n\nNew commits:\n<table><tr><td><a href=\"https://github.com/sagemath/sagetrac-mirror/commit/491093cea9255af384beb6e38d321fd3f5a5b2ca\"><code>491093c</code></a></td><td><code>Return 0 instead of NULL to fix compiler warning</code></td></tr><tr><td><a href=\"https://github.com/sagemath/sagetrac-mirror/commit/b5ff9318c0bfa9720f6947f2fcdceb8f7fe2279d\"><code>b5ff931</code></a></td><td><code>Do not use \"long double\" functions for Pynac</code></td></tr></table>\n",
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"body": "<div id=\"comment:3\" align=\"right\">comment:3</div>\n\nI don't know anything about Pynac but LGTM otherwise.",
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I don't know anything about Pynac but LGTM otherwise.
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LGTM too. I have put your real name in the Reviewer: field and set positive for you.
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"body": "<div id=\"comment:5\" align=\"right\">comment:5</div>\n\nActually one the commit will fix a QA problem reported by portage in sage-on-gentoo. Quite happy about that.",
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Actually one the commit will fix a QA problem reported by portage in sage-on-gentoo. Quite happy about that.
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"body": "<div id=\"comment:7\" align=\"right\">comment:7</div>\n\nOn OSX:\n\n```\nsage -t --long src/sage/symbolic/pynac.pyx\n**********************************************************************\nFile \"src/sage/symbolic/pynac.pyx\", line 1795, in sage.symbolic.pynac.py_lgamma\nFailed example:\n py_lgamma(4.r)\nExpected:\n 1.791759469228055\nGot:\n 1.7917594692280552\n**********************************************************************\nFile \"src/sage/symbolic/pynac.pyx\", line 1797, in sage.symbolic.pynac.py_lgamma\nFailed example:\n py_lgamma(4r)\nExpected:\n 1.791759469228055\nGot:\n 1.7917594692280552\n**********************************************************************\n1 item had failures:\n 2 of 7 in sage.symbolic.pynac.py_lgamma\n```",
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On OSX:
sage -t --long src/sage/symbolic/pynac.pyx
**********************************************************************
File "src/sage/symbolic/pynac.pyx", line 1795, in sage.symbolic.pynac.py_lgamma
Failed example:
py_lgamma(4.r)
Expected:
1.791759469228055
Got:
1.7917594692280552
**********************************************************************
File "src/sage/symbolic/pynac.pyx", line 1797, in sage.symbolic.pynac.py_lgamma
Failed example:
py_lgamma(4r)
Expected:
1.791759469228055
Got:
1.7917594692280552
**********************************************************************
1 item had failures:
2 of 7 in sage.symbolic.pynac.py_lgamma
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"body": "<div id=\"comment:8\" align=\"right\">comment:8</div>\n\nInteresting. So on OS X, `(double)lgammal(4.0)` is not the same as `lgamma(4.0)`",
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Interesting. So on OS X, (double)lgammal(4.0) is not the same as lgamma(4.0)
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"body": "<div id=\"comment:9\" align=\"right\">comment:9</div>\n\n...which isn't that surprising perhaps, since `lgamma()` probably uses a less precise algorithm than `lgammal()`. Anyway, the error is still less than 1 ulp, so I will just add some `# abs tol`.",
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...which isn't that surprising perhaps, since lgamma() probably uses a less precise algorithm than lgammal(). Anyway, the error is still less than 1 ulp, so I will just add some # abs tol.
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Trivially putting it back to positive review.
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