- GiNaC-devel - ginac.de

GiNaC 1.8.5 released
by Richard B. Kreckel 01 Jan '23

01 Jan '23

Happy New Year! As in 2022, New Year's Day brings a new GiNaC release. The only change is in factor(): * Speed up multivariate polynomial factorization; fix it in some rare corner cases where it didn't previously terminate. ...and happy hacking! -richy. -- Richard B. Kreckel <https://in.terlu.de/~kreckel/>

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[SCM] GiNaC -- a C++ library for symbolic computations tag, release_1-8-5, created. release_1-4-0-757-g64f88ee6
by Richard B. Kreckel 01 Jan '23

01 Jan '23

This is an automated email from the git hooks/post-receive script. It was generated because a ref change was pushed to the repository containing the project "GiNaC -- a C++ library for symbolic computations". The tag, release_1-8-5 has been created at 64f88ee6b3f55383013d73a22eb3bfce60234dcc (commit) - Log ----------------------------------------------------------------- commit 64f88ee6b3f55383013d73a22eb3bfce60234dcc Author: Richard Kreckel <kreckel(a)ginac.de> Date: Sun Jan 1 14:31:35 2023 +0100 Finalize 1.8.5 release. ----------------------------------------------------------------------- hooks/post-receive -- GiNaC -- a C++ library for symbolic computations

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[SCM] GiNaC -- a C++ library for symbolic computations branch, master, updated. release_1-4-0-757-g64f88ee6
by Richard B. Kreckel 01 Jan '23

01 Jan '23

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[SCM] GiNaC -- a C++ library for symbolic computations branch, master, updated. release_1-4-0-755-g3b979da1
by Richard B. Kreckel 29 Dec '22

29 Dec '22

This is an automated email from the git hooks/post-receive script. It was generated because a ref change was pushed to the repository containing the project "GiNaC -- a C++ library for symbolic computations". The branch, master has been updated via 3b979da1d5bbbc57dda660a5d9ba67abea30f70c (commit) via 3dde1c1a46cda22f908c8005771550a51c5aec33 (commit) from 4fd717045b56a15ee8602dfd005d7362db738d0a (commit) Those revisions listed above that are new to this repository have not appeared on any other notification email; so we list those revisions in full, below. - Log ----------------------------------------------------------------- commit 3b979da1d5bbbc57dda660a5d9ba67abea30f70c Author: Richard Kreckel <kreckel(a)ginac.de> Date: Thu Dec 29 21:00:36 2022 +0100 Minor refactoring in factor.cpp. - Substitute the misnamed expt_pos(a,q) with the more specialized expt_pos_Q(w,a,q,r) function, for use by distinct_degree_factor(). - Rework canonicalize function and change semantics of its hint argument to be more natural. - Use the hint argument of canonicalize() in rem(). - Add some documenting comments. commit 3dde1c1a46cda22f908c8005771550a51c5aec33 Author: Richard Kreckel <kreckel(a)ginac.de> Date: Fri Dec 23 00:44:23 2022 +0100 Some more minor optimizations in factor.cpp. This isn't changing much, but once I've seen a missed opportunity, it keeps catching the eye and then it's hard to resist. :-) ----------------------------------------------------------------------- Summary of changes: ginac/factor.cpp | 117 ++++++++++++++++++++++++------------------------------- 1 file changed, 51 insertions(+), 66 deletions(-) hooks/post-receive -- GiNaC -- a C++ library for symbolic computations

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[SCM] GiNaC -- a C++ library for symbolic computations branch, master, updated. release_1-4-0-753-g4fd71704
by Richard B. Kreckel 22 Dec '22

22 Dec '22

This is an automated email from the git hooks/post-receive script. It was generated because a ref change was pushed to the repository containing the project "GiNaC -- a C++ library for symbolic computations". The branch, master has been updated via 4fd717045b56a15ee8602dfd005d7362db738d0a (commit) from 35a742a26893a534ddf1e51bd6d08f09dc927c43 (commit) Those revisions listed above that are new to this repository have not appeared on any other notification email; so we list those revisions in full, below. - Log ----------------------------------------------------------------- commit 4fd717045b56a15ee8602dfd005d7362db738d0a Author: Richard Kreckel <kreckel(a)ginac.de> Date: Thu Dec 22 18:19:59 2022 +0100 Fix internal next_prime(n) function. This helper function was doing wild things when called the wrong way. E.g. it would allocate obscene amounts of memory and run for ages when called with an argument that has never been returned by it before. In the context where it's being used so far this is not a problem. But it's better to make it foolproof and spare a new user some possible despair and distress. ----------------------------------------------------------------------- Summary of changes: ginac/factor.cpp | 40 +++++++++++++++++----------------------- 1 file changed, 17 insertions(+), 23 deletions(-) hooks/post-receive -- GiNaC -- a C++ library for symbolic computations

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[SCM] GiNaC -- a C++ library for symbolic computations branch, master, updated. release_1-4-0-752-g35a742a2
by Richard B. Kreckel 19 Dec '22

19 Dec '22

This is an automated email from the git hooks/post-receive script. It was generated because a ref change was pushed to the repository containing the project "GiNaC -- a C++ library for symbolic computations". The branch, master has been updated via 35a742a26893a534ddf1e51bd6d08f09dc927c43 (commit) via 8f3ff73a0ff22d4855c2f8e798cc69db09af3263 (commit) via 1f14fb79bacd8de080c73a930bf9f8a5d514cbe0 (commit) from 7ddcbce353f5811a8967297eece3fdff7ae04f50 (commit) Those revisions listed above that are new to this repository have not appeared on any other notification email; so we list those revisions in full, below. - Log ----------------------------------------------------------------- commit 35a742a26893a534ddf1e51bd6d08f09dc927c43 Author: Richard Kreckel <kreckel(a)ginac.de> Date: Mon Dec 19 20:17:55 2022 +0100 Prefer CLN left shift operations over multiplications in factor(). commit 8f3ff73a0ff22d4855c2f8e798cc69db09af3263 Author: Richard Kreckel <kreckel(a)ginac.de> Date: Mon Dec 19 20:13:11 2022 +0100 Change some internal lst to exvector in factor.cpp... ...in places where c[i] is more readable than c.op(i) or the insidious c.let_op(i) notation. commit 1f14fb79bacd8de080c73a930bf9f8a5d514cbe0 Author: Richard Kreckel <kreckel(a)ginac.de> Date: Mon Dec 19 18:14:32 2022 +0100 [BUGFIX] Fix corner cases of factor_multivariate(). In some rare cases, factor() failed with what looks like an endless loop trying evaluation homomorphisms with ever increasing moduli (or maybe it just took eons to complete). Whether this happened depended on which symbol was left unevaluated for univariate factorization. As a workaround for this problem, we now apply the evaluation homomorphism for each symbol in a round-robin mode until one of them succeeds. This somewhat speeds up factorization of multivariate polynomials even in those cases where the old implementation terminated in time. Thanks to Vitaly Magerya <vmagerya(a)gmail.com> for reporting this. ----------------------------------------------------------------------- Summary of changes: check/exam_factor.cpp | 37 +++++++ ginac/factor.cpp | 262 ++++++++++++++++++++++++++++---------------------- 2 files changed, 183 insertions(+), 116 deletions(-) hooks/post-receive -- GiNaC -- a C++ library for symbolic computations

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[SCM] GiNaC -- a C++ library for symbolic computations branch, master, updated. release_1-4-0-749-g7ddcbce3
by Richard B. Kreckel 15 Nov '22

15 Nov '22

This is an automated email from the git hooks/post-receive script. It was generated because a ref change was pushed to the repository containing the project "GiNaC -- a C++ library for symbolic computations". The branch, master has been updated via 7ddcbce353f5811a8967297eece3fdff7ae04f50 (commit) via d4a58b74cea7c813330aa7813d86713bee205d04 (commit) via cdb367739f507337ef1aa5c973e4671c908cf361 (commit) via cdce7eb2282dbb095e9ae079da371c78b7c5150e (commit) from d39db5674734029a7aa11ea4446fd8923d51ce0e (commit) Those revisions listed above that are new to this repository have not appeared on any other notification email; so we list those revisions in full, below. - Log ----------------------------------------------------------------- commit 7ddcbce353f5811a8967297eece3fdff7ae04f50 Author: Richard Kreckel <kreckel(a)ginac.de> Date: Tue Nov 15 00:08:28 2022 +0100 Refactor internal calc_bound() routines. Reduce them to computation of absolute values of the polynomial's roots and document that this is known as Landau's inequality. The multiplication with a power of two is done by the caller. Also remove the internal fallback computation using the maxcoeff since this cannot happen. (In the worst case, there is only one non-zero coefficient 'a'. Then we compute sqrt(a^2) which is not smaller than a. Otherwise, we compute sqrt(a^2 + x) > a.) commit d4a58b74cea7c813330aa7813d86713bee205d04 Author: Richard Kreckel <kreckel(a)ginac.de> Date: Mon Nov 14 23:13:21 2022 +0100 Remove own definition of enable_if<B, T> in favor of... ...the definition provided by <type_traits> since C++11. commit cdb367739f507337ef1aa5c973e4671c908cf361 Author: Richard Kreckel <kreckel(a)ginac.de> Date: Mon Nov 14 23:05:47 2022 +0100 [DEBUG] Make some debug output operators compile in factor.cpp... ...for the case when somebody actually #defines DEBUGFACTOR. The operators must be in the same anonymous namespace in which umodpoly, upoly and upvec are typedef'ed. (I'm not really sure I understand why but that's what GCC and CLang are convinced of.) commit cdce7eb2282dbb095e9ae079da371c78b7c5150e Author: Richard Kreckel <kreckel(a)ginac.de> Date: Thu Oct 13 00:12:07 2022 +0200 Optimize some use of CLN's expt_pos() function in factor(). (Not that it's slow or mattered much, but why waste cycles?) ----------------------------------------------------------------------- Summary of changes: ginac/factor.cpp | 54 ++++++++++++++++++++---------------------------------- 1 file changed, 20 insertions(+), 34 deletions(-) hooks/post-receive -- GiNaC -- a C++ library for symbolic computations

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Re: [GiNaC-devel] web page
by Vladimir V. Kisil 06 Oct '22

06 Oct '22

Dear Colleagues, I think that it may be time to patch the GiNaC web page. The passed months showed that the situation is much more complicated and dangerous than we may think back in March. Current information flows are full of fakes, manipulations and war-time propaganda. The sequence of events will be a subject for heated debates for decades to come. Yet, I cannot see a side which is advocating an end of the war unless it will be their complete victory. Deaths and suffering of Ukraine population are not considered as an obstacle towards the designated goals. Thus I propose to delete the following sentences from the statement: "We must make the Russian government understand the value and prospect of peaceful cooperation and end this war now." Also I propose to leave the previous sentence "We strongly support the call for peace in Ukraine." but without the link in it. In my opinion, the quoted letter is not free from a bias which reduces the peaceful call in the sentence. Alternatively, we may delete the whole statement all together. Calling for peace we shall do the first step ourselves by not taking a side in the ongoing war. Best wishes, Vladimir -- Vladimir V. Kisil http://www.maths.leeds.ac.uk/~kisilv/ Book: Geometry of Mobius Maps https://doi.org/10.1142/p835 Soft: Geometry of cycles http://moebinv.sourceforge.net/ Jupyter notebooks: https://github.com/vvkisil?tab=repositories >>>>> On Mon, 7 Mar 2022 10:07:53 +0000, "Richard B. Kreckel" <kreckel(a)in.terlu.de> said: RK> Dear Vladimir, RK> You made a very good point. I hope you appreciate the slightly RK> modified version. Thank you! RK> -richard. RK> On 07.03.22 00:33, Vladimir V. Kisil wrote: >> I was always admired by the careful and considerate approach of >> GiNaC team to code alterations. It is well justified in >> complicated systems since a single human can easily oversee some >> important connections and unintentionally break functionality. >> >> Being busy with our various duties we may not have enough time to >> follow all world events in their historic development and may >> have limited resources to analyse evidences as carefully as we >> try to do this in science or coding. >> >> Being a citizen of Ukraine I am willing to stop casualties of >> peaceful residents and enormous destruction to their life. But I >> believe this requires an appeals not to Russia only. There are >> many countries deeply evolved in this conflict and most of them >> are only supplying massive warfare to fuel it even >> further. People in Ukraine are suffering because THEIR LIVES ARE >> NOT MATTER to anyone at all. >> >> If you wish to raise a voice on this very hot and controversial >> situation you may want to be as careful as you usually do >> applying a patch. >> >> Best wishes, Vladimir

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GiNaC 1.8.4 released
by Richard B. Kreckel 19 Sep '22

19 Sep '22

Hi, GiNaC 1.8.4 has been tagged and released with some unplanned git noise. The News: * Complete the support for sqrfree_parfrac(). * Add info methods for transcendental functions. -richy. -- Richard B. Kreckel <https://in.terlu.de/~kreckel/>

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[SCM] GiNaC -- a C++ library for symbolic computations tag, release_1-8-4, created. release_1-4-0-745-gd39db567
by Richard B. Kreckel 19 Sep '22

19 Sep '22

This is an automated email from the git hooks/post-receive script. It was generated because a ref change was pushed to the repository containing the project "GiNaC -- a C++ library for symbolic computations". The tag, release_1-8-4 has been created at d39db5674734029a7aa11ea4446fd8923d51ce0e (commit) - Log ----------------------------------------------------------------- commit d39db5674734029a7aa11ea4446fd8923d51ce0e Author: Richard Kreckel <kreckel(a)ginac.de> Date: Mon Sep 19 11:09:36 2022 +0200 Really finalize 1.8.4 release. Fix SONAME screw-up in last commit. ----------------------------------------------------------------------- hooks/post-receive -- GiNaC -- a C++ library for symbolic computations

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