- GiNaC-devel - ginac.de

[SCM] GiNaC -- a C++ library for symbolic computations branch, master, updated. release_1-4-0-455-gbe20719
by git＠ginac.de 24 Jul '15

24 Jul '15

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 be207191d6230add6ddd6aec2ac0b12a0e302f37 (commit) from d56a0f74afa5380a1730599c3b1b21f34be2f061 (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 be207191d6230add6ddd6aec2ac0b12a0e302f37 Author: Stefan Weinzierl <weinzierl(a)uni-mainz.de> Date: Fri Jul 24 20:50:57 2015 +0200 Fix bug in PolyLogs of rational numbers. Thanks to Alexander Hasselhuhn for reporting this bug. ----------------------------------------------------------------------- Summary of changes: ginac/inifcns_nstdsums.cpp | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) hooks/post-receive -- GiNaC -- a C++ library for symbolic computations

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Bug fix polylogs
by Stefan Weinzierl 24 Jul '15

24 Jul '15

Dear all, this is a bug fix for the bug reported in http://www.cebix.net/pipermail/ginac-list/2015-July/002053.html The bug occured because a call to ex_to<numeric>(y) inside the polylog routines would fail for y=sqrt(2), resulting in a sub-sequent segmentation fault. In GiNaC sqrt(2) is treated as an exact number, not as a floating number. With the fix, the routine now returns unevaluated (as it should). An explicit call to evalf() forces a conversion to floats. In order to enable this, the option do_not_evalf_params() has been removed for the G-functions. This is safe for the G-functions, the purpose of the do_not_evalf_params-option is to avoid a conversion of genuine integer arguments (as in Li, S, H, zeta1 or zeta2) to floats. Best wishes, Stefan

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Bug fix polylogs
by Stefan Weinzierl 24 Jul '15

24 Jul '15

Dear all, this is a bug fix for the bug reported in http://www.cebix.net/pipermail/ginac-list/2015-July/002053.html The bug occured because a call to ex_to<numeric>(y) inside the polylog routines would fail for y=sqrt(2), resulting in a sub-sequent segmentation fault. In GiNaC sqrt(2) is treated as an exact number, not as a floating number. With the fix, the routine now returns unevaluated (as it should). An explicit call to evalf() forces a conversion to floats. In order to enable this, the option do_not_evalf_params() has been removed for the G-functions. This is safe for the G-functions, the purpose of the do_not_evalf_params-option is to avoid a conversion of genuine integer arguments (as in Li, S, H, zeta1 or zeta2) to floats. Best wishes, Stefan

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[SCM] GiNaC -- a C++ library for symbolic computations branch, master, updated. release_1-4-0-454-gd56a0f7
by git＠ginac.de 19 Jul '15

19 Jul '15

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 d56a0f74afa5380a1730599c3b1b21f34be2f061 (commit) via aa1ddc484c2a22a1ab2b38047cbd221f9b37750a (commit) from 3e3c363cab88f5234ee6aaa80ee55463069b30a3 (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 d56a0f74afa5380a1730599c3b1b21f34be2f061 Author: Richard Kreckel <kreckel(a)ginac.de> Date: Sun Jul 19 00:04:49 2015 +0200 Speed up pow(+(...),n).expand() where n>2. This new algorithm is faster than the old one because it re-uses multinomial coefficients as much as possible. commit aa1ddc484c2a22a1ab2b38047cbd221f9b37750a Author: Richard Kreckel <kreckel(a)ginac.de> Date: Sat Jul 18 23:56:55 2015 +0200 Fix pow(+(...),2).expand(). Due to a failure to expand result terms, expand((sqrt(1+x)+y*sqrt(1+x))^2) returned 1+y^2+x+x*y^2+2*y*(1+x). Note that 2*y*(1+x) was not expanded to 2*y+2*y*x. ----------------------------------------------------------------------- Summary of changes: check/exam_paranoia.cpp | 13 ++ check/timer.cpp | 1 - ginac/add.cpp | 4 +- ginac/power.cpp | 384 ++++++++++++++++++++++++++++++++++++++---------- 4 files changed, 320 insertions(+), 82 deletions(-) hooks/post-receive -- GiNaC -- a C++ library for symbolic computations

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Derivative of abs()
by Jan 04 Jun '15

04 Jun '15

Hi, is there any reason not to define the derivative of the built-in abs() function as either abs(x)/x or csgn(x) ? Currently it has not derivative defined at all. Regards, Jan

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Release 1.6.4
by Richard B. Kreckel 08 May '15

08 May '15

Hi, A new GiNaC release is out and available. These are the changes: * Fixed pow(+(...),2).expand() where the sum contained roots of rationals. * Various improvements for info(info_flags::nonnegative). * Make power::expand() (x*p)^c -> x^c * p^c, if p>0. * Fixed normal() where nested functions occur multiple times. * Add optional explicit derivatives to functions and use it in abs(), imag_part(), real_part(). * Evaluate abs(z)^(2n) -> z^n * conjugate(z)^n. Happy hacking -richy. -- Richard B. Kreckel <http://in.terlu.de/~kreckel/>

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[SCM] GiNaC -- a C++ library for symbolic computations branch, master, updated. release_1-4-0-452-g3e3c363
by git＠ginac.de 08 May '15

08 May '15

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 3e3c363cab88f5234ee6aaa80ee55463069b30a3 (commit) from 56055db8e4780d223f6ddc680fb09ef994691c1d (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 3e3c363cab88f5234ee6aaa80ee55463069b30a3 Author: Richard Kreckel <kreckel(a)ginac.de> Date: Fri May 8 09:35:24 2015 +0200 Finalized 1.6.4 release. ----------------------------------------------------------------------- Summary of changes: INSTALL | 2 +- NEWS | 9 +++++++++ ginac/version.h | 4 ++-- 3 files changed, 12 insertions(+), 3 deletions(-) hooks/post-receive -- GiNaC -- a C++ library for symbolic computations

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[SCM] GiNaC -- a C++ library for symbolic computations tag, ginac_1-6-4, created. release_1-4-0-452-g3e3c363
by git＠ginac.de 08 May '15

08 May '15

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, ginac_1-6-4 has been created at 3e3c363cab88f5234ee6aaa80ee55463069b30a3 (commit) - Log ----------------------------------------------------------------- commit 3e3c363cab88f5234ee6aaa80ee55463069b30a3 Author: Richard Kreckel <kreckel(a)ginac.de> Date: Fri May 8 09:35:24 2015 +0200 Finalized 1.6.4 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_1-4-0-451-g56055db
by git＠ginac.de 07 May '15

07 May '15

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 56055db8e4780d223f6ddc680fb09ef994691c1d (commit) from 84e6538290cbd2b13b755254c62689a404ce91b4 (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 56055db8e4780d223f6ddc680fb09ef994691c1d Author: Richard Kreckel <kreckel(a)ginac.de> Date: Thu May 7 22:33:13 2015 +0200 Fix pow(+(...),2).expand(). Due to a failure to recombine coeffs and rests to expairs, expand((x+sqrt(2)*x)^2) returned x^2+2*x^2+2*sqrt(2)*x^2. The 2*x^2 term was not combined with the x^2 term to 3*x^2 because it was not the canonical expair [[x^2,2]] but rather [[2*x^2,1]]. Thanks to Isuru Fernando for the bugreport. ----------------------------------------------------------------------- Summary of changes: check/exam_paranoia.cpp | 13 +++++++++++++ ginac/power.cpp | 8 ++++---- 2 files changed, 17 insertions(+), 4 deletions(-) hooks/post-receive -- GiNaC -- a C++ library for symbolic computations

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Re: [GiNaC-devel] [GiNaC-list] Symbolic Integration of exponential functions
by Vladimir V. Kisil 27 Apr '15

27 Apr '15

Dear All, What is easy to do is to add to function class a primitive feature analogously to their knowledge of derivatives. Then, integral::eval_integ() may call such methods to evaluate simple integrals of plain functions. If this looks reasonable to be included in GiNaC, then I may write such a patch. Best wishes, Vladimir -- Vladimir V. Kisil http://www.maths.leeds.ac.uk/~kisilv/ Book: Geometry of Mobius Transformations http://goo.gl/EaG2Vu Software: Geometry of cycles http://moebinv.sourceforge.net/ >>>>> On Sat, 14 Mar 2015 17:35:10 +0100, Matthias Reis <matthias.reis(a)biologie.hu-berlin.de> said: MR> Dear all, as far as I understand, ginac cannot integrate MR> anything other than polynomials. How hard would it be (for me MR> maybe) to implement exponentials? What needs to be done? This MR> feature would be great for me. I just need to integrate simple MR> e^{x * constant} terms. MR> Best regards, Matthias

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