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Size: 5324
Comment: add numerical noise in sage/rings/qqbar.py issue
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← Revision 24 as of 2022-04-05 02:15:00 ⇥
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Comment: outdated
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| = Sage 3.2.3 on Solaris x86 build notes = == Build Issues == * numpy's root finding code segfaults when linked against ATLAS - no solution yet, but as a workaround build numpy without ATLAS support * spkg-install in jmol is borken - a fix is coming * gnucrypot 1.4.0 needs too much entropy at startup - an upgrade to 1.4.3 fixes that. From the release notes of version 1.4.1 (2008-04-25): {{{ * Fixed a bug introduced by 1.3.1 which led to the comsumption of far too much entropy for the intial seeding. }}} == Fixes == === sage-native-execute is using bashism === {{{ diff -r 396119818b99 sage-native-execute --- a/sage-native-execute Fri Jan 02 14:18:47 2009 -0800 +++ b/sage-native-execute Thu Jan 08 03:15:44 2009 -0500 @@ -1,4 +1,4 @@ -#!/bin/sh +#!/usr/bin/env bash export LD_LIBRARY_PATH=$SAGE_ORIG_LD_LIBRARY_PATH if [ `uname` = 'Darwin' ]; then }}} === interface/singular.py pexpect hangs === Singular seems to be limited to about 180 characters via the pexpect interface. Applying this patch works around that limitation by using the file interface: {{{ diff -r e69ceb84399b sage/interfaces/singular.py --- a/sage/interfaces/singular.py Fri Jan 02 23:01:05 2009 -0500 +++ b/sage/interfaces/singular.py Sat Jan 10 13:29:09 2009 -0500 @@ -316,7 +316,7 @@ restart_on_ctrlc = True, verbose_start = False, logfile = logfile, - eval_using_file_cutoff=1000) + eval_using_file_cutoff=100) self.__libs = [] self._prompt_wait = prompt self.__to_clear = [] # list of variable names that need to be cleared. }}} === NaN vs. nan and Infinity vs. inf in real_double.pyx === {{{ ********************************************************************** File "/home/mabshoff/build-3.2.3.final/sage-3.2.3.final-fulvia/devel/sage/sage/rings/real_double.pyx", line 1311: sage: RDF(0).log() Expected: -inf Got: -Infinity ********************************************************************** File "/home/mabshoff/build-3.2.3.final/sage-3.2.3.final-fulvia/devel/sage/sage/rings/real_double.pyx", line 1313: sage: RDF(-1).log() Expected: nan Got: -NaN }}} This is fixed by the following patch since we now rely on GSL again instead of the underlying libc representation: {{{ diff -r e69ceb84399b sage/rings/real_double.pyx --- a/sage/rings/real_double.pyx Fri Jan 02 23:01:05 2009 -0500 +++ b/sage/rings/real_double.pyx Sat Jan 10 19:05:27 2009 -0500 @@ -1283,9 +1283,9 @@ cdef _log_base(self, double log_of_base): if self._value < 2: if self._value == 0: - return -1./0 + return RDF(-1)/RDF(0) if self._value < 0: - return 0./0 + return RDF(0)/RDF(0) _sig_on a = self._new_c(gsl_sf_log_1plusx(self._value - 1) / log_of_base) _sig_off }}} === nan vs. NaN in complex_double.pyx === {{{ ********************************************************************** File "/home/mabshoff/build-3.2.3.final/sage-3.2.3.final-fulvia/devel/sage/sage/rings/complex_double.pyx", line 895: sage: ~(0*CDF(0,1)) Expected: nan + nan*I Got: -NaN + NaN*I ********************************************************************** }}} The following terrible hack fixes that problem: {{{ diff -r e69ceb84399b sage/rings/complex_double.pyx --- a/sage/rings/complex_double.pyx Fri Jan 02 23:01:05 2009 -0500 +++ b/sage/rings/complex_double.pyx Sat Jan 10 19:30:41 2009 -0500 @@ -789,7 +789,8 @@ s = s+"%s*I"%y if len(s) == 0: s = "0" - return s + s_clean=s.replace("NaN","nan").replace("-nan","nan") + return s_clean def _latex_(self): """ }}} === Numerical noise in sage/rings/qqbar.py === {{{ [4:36pm] mabs: cwitty: I have another interesting bug for you: [4:36pm] mabs: File "/home/mabshoff/build-3.2.3.final/sage-3.2.3.final-fulvia/devel/sage/sage/rings/qqbar.py", line 3826: [4:36pm] mabs: sage: cp.complex_roots(30, 1) [4:36pm] mabs: Expected: [4:36pm] mabs: [1.189207115002721?, [4:36pm] mabs: -1.189207115002721?, [4:36pm] mabs: 1.189207115002721?*I, [4:36pm] mabs: -1.189207115002721?*I] [4:36pm] mabs: Got: [4:36pm] mabs: [1.189207115002721?, -1.189207115002722?, 1.189207115002721?*I, -1.189207115002721?*I] [4:37pm] mabs: Notice that the second and third entries are different? [4:37pm] mabs: Ehh, the second only [4:38pm] cwitty: Yes. It's probably not a bug; complex_roots doesn't guarantee to find the tightest possible interval, and it depends on ATLAS which doesn't guarantee identical results. [4:38pm] mabs: ok [4:38pm] mabs: Should I use "..." then? [4:38pm] cwitty: Yes. }}} * Other fixes to the Sage library: 3.2.3.final-solaris-fixes.patch, 3.2.3.final-solaris-getrusage-.patch == Doctest Failures == * coming soon - about 30 doctests failed, but about 15 to 20 are fixable with little effort == Other Annoyances == * -sdist as well as -bdist is seriously broken with BSD-ish shell utils installed in the default path on Solaris |
