- GiNaC-devel - ginac.de

[SCM] GiNaC -- a C++ library for symbolic computations branch, master, updated. release_1-4-0-431-g9e80b0d
by git＠ginac.de 12 Sep '14

12 Sep '14

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 9e80b0d339d1ce83f51e0eb5fb101c41f23f6a71 (commit) from 708491c9e2df3690d58f1d93e4bd0506baeac103 (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 9e80b0d339d1ce83f51e0eb5fb101c41f23f6a71 Author: Alexei Sheplyakov <Alexei.Sheplyakov(a)gmail.com> Date: Fri Sep 12 17:50:51 2014 +0400 G_numeric: fix evaluation with y == 1 Do apply Hoelder convolution if y == 1 even if there are trailing zeros. Fixes the regression introduced by commit 97ef604e ("G_numeric: fix numeric evaluation with trailing zeros and y != 1.") ----------------------------------------------------------------------- Summary of changes: check/exam_inifcns_nstdsums.cpp | 28 ++++++++++++++++++++++++++++ ginac/inifcns_nstdsums.cpp | 9 ++++++--- 2 files changed, 34 insertions(+), 3 deletions(-) hooks/post-receive -- GiNaC -- a C++ library for symbolic computations

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Two previous patches
by Vladimir V. Kisil 10 Sep '14

10 Sep '14

Dear All, I am attaching two patches which were submitted in Nov 2013, and discussed at http://www.ginac.de/pipermail/ginac-devel/2013-November/ The first patch was modified after this discussion and no further objection were raised to either of them. Best wishes, Vladimir -- Vladimir V. Kisil email: kisilv(a)maths.leeds.ac.uk www: http://www.maths.leeds.ac.uk/~kisilv/ Book: Geometry of Mobius Transformations http://www.worldscientific.com/worldscibooks/10.1142/p835

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[SCM] GiNaC -- a C++ library for symbolic computations branch, master, updated. release_1-4-0-430-g708491c
by git＠ginac.de 08 Sep '14

08 Sep '14

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 708491c9e2df3690d58f1d93e4bd0506baeac103 (commit) from d55314ec284f24063e949c5c3f3ee57011ddb283 (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 708491c9e2df3690d58f1d93e4bd0506baeac103 Author: Alexei Sheplyakov <Alexei.Sheplyakov(a)gmail.com> Date: Sun Sep 7 22:56:02 2014 +0400 Add more ex::is_polynomial() tests Improves commit 92da4c16 ('[bugfix] ex::is_polynomial(x): fix miscomputations') a little bit. ----------------------------------------------------------------------- Summary of changes: check/exam_paranoia.cpp | 23 +++++++++++++++++++++++ 1 files changed, 23 insertions(+), 0 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_1-4-0-429-gd55314e
by git＠ginac.de 07 Sep '14

07 Sep '14

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 d55314ec284f24063e949c5c3f3ee57011ddb283 (commit) from 92da4c16f5d6edf276be011a08ce04b352945a83 (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 d55314ec284f24063e949c5c3f3ee57011ddb283 Author: Vladimir V. Kisil <kisilv(a)maths.leeds.ac.uk> Date: Mon Aug 18 21:29:01 2014 +0100 Providing default (un)archiving for cliffordunit class. Signed-off-by: Vladimir V. Kisil <kisilv(a)maths.leeds.ac.uk> ----------------------------------------------------------------------- Summary of changes: ginac/clifford.cpp | 1 + ginac/clifford.h | 1 + 2 files changed, 2 insertions(+), 0 deletions(-) hooks/post-receive -- GiNaC -- a C++ library for symbolic computations

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Archiving symbols with empty names
by Vladimir V. Kisil 22 Aug '14

22 Aug '14

Dear All, Developing an archiving routine for a GiNaC derived class I met the following problem. Some code (e.g. clifford.cpp) creates indexed objects with several dynamically created indexes labelled by new symbols with empty names. If such indexed objects are archived, then empty-named symbols are treated as identical and the restored object has a wrong number of indexes (only one). There is a line in void symbol::archive(archive_node &n) const, telling // XXX: we should not archive anonymous symbols. Shall this be fixed somehow? Best wishes, Vladimir -- Vladimir V. Kisil email: kisilv(a)maths.leeds.ac.uk www: http://www.maths.leeds.ac.uk/~kisilv/ Book: Geometry of Mobius Transformations http://www.worldscientific.com/worldscibooks/10.1142/p835

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(un)archive cliffordunit
by Vladimir V. Kisil 18 Aug '14

18 Aug '14

Dear All, It comes to my attention that cliffordunit class was not supplied with (un)archiving methods. I am attaching a trivial patch for this. Best wishes, Vladimir -- Vladimir V. Kisil email: kisilv(a)maths.leeds.ac.uk www: http://www.maths.leeds.ac.uk/~kisilv/ Book: Geometry of Mobius Transformations http://www.worldscientific.com/worldscibooks/10.1142/p835

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why does power(add) switch the sign of the add?
by Jan 13 Aug '14

13 Aug '14

Hi, I noticed the following behaviour of power::eval(), for example in ginsh: > (x_1 - x_2 + x_3 - x_4)^2; (x_4-x_1-x_3+x_2)^2 The sign of the sum is switched. Of course, mathematically this is totally correct, but is there any good reason why GiNaC should do it? It seems to go back to the following piece of code in power.cpp, power::eval() --------- // (2*x + 6*y)^(-4) -> 1/16*(x + 3*y)^(-4) if (num_exponent->is_integer() && is_exactly_a<add>(ebasis)) { numeric icont = ebasis.integer_content(); const numeric lead_coeff = ex_to<numeric>(ex_to<add>(ebasis).seq.begin()->coeff).div(icont); const bool canonicalizable = lead_coeff.is_integer(); >>> HERE ============================ const bool unit_normal = lead_coeff.is_pos_integer(); if (canonicalizable && (! unit_normal)) icont = icont.mul(*_num_1_p); >>> HERE ============================ if (canonicalizable && (icont != *_num1_p)) { const add& addref = ex_to<add>(ebasis); add* addp = new add(addref); addp->setflag(status_flags::dynallocated); addp->clearflag(status_flags::hash_calculated); addp->overall_coeff = ex_to<numeric>(addp->overall_coeff).div_dyn(icont); for (epvector::iterator i = addp->seq.begin(); i != addp->seq.end(); ++i) i->coeff = ex_to<numeric>(i->coeff).div_dyn(icont); const numeric c = icont.power(*num_exponent); if (likely(c != *_num1_p)) return (new mul(power(*addp, *num_exponent), c))->setflag(status_flags::dynallocated); else return power(*addp, *num_exponent); } } ------------ Why not leave away this bit of code, improve performance by a tiny little bit, and get somewhat more predictable behaviour of GiNaC? Jan

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[SCM] GiNaC -- a C++ library for symbolic computations branch, master, updated. release_1-4-0-428-g92da4c1
by git＠ginac.de 26 Jul '14

26 Jul '14

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 92da4c16f5d6edf276be011a08ce04b352945a83 (commit) from 4e53a7554e39c687b6cf467af3c967760ce3a521 (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 92da4c16f5d6edf276be011a08ce04b352945a83 Author: Richard Kreckel <kreckel(a)ginac.de> Date: Fri Jul 25 23:11:11 2014 +0000 [bugfix] ex::is_polynomial(x): fix miscomputations The function power::is_polynomial(x) sometimes returned false, even if x did not occur in the power object. Thanks to Rubel Zilibowitz for reporting this bug. Similarly, mul::is_polynomial(x) sometimes returned true, even if x occurred only in the denominator of a rational function. The function mul::is_polynomial(x) does a simpler version of power::is_polynomial(x) on its factors. (It's simpler because the exponents cannot be functions of x.) ----------------------------------------------------------------------- Summary of changes: check/exam_paranoia.cpp | 14 ++++++++++++-- ginac/mul.cpp | 2 +- ginac/power.cpp | 15 ++++++++++----- 3 files changed, 23 insertions(+), 8 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_1-4-0-427-g4e53a75
by git＠ginac.de 22 Jul '14

22 Jul '14

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 4e53a7554e39c687b6cf467af3c967760ce3a521 (commit) from 13964f3416ec9de8829b57d4a2bbd9fe9a6db4ef (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 4e53a7554e39c687b6cf467af3c967760ce3a521 Author: Richard Kreckel <kreckel(a)ginac.de> Date: Tue Jul 22 07:48:25 2014 +0000 Fix example of symmetrization in tutorial. The old example was illegal C++. Thanks to Rubel Zilibowitz for reporting this error. ----------------------------------------------------------------------- Summary of changes: doc/tutorial/ginac.texi | 6 +++--- 1 files changed, 3 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 branch, master, updated. release_1-4-0-426-g13964f3
by git＠ginac.de 21 Jul '14

21 Jul '14

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 13964f3416ec9de8829b57d4a2bbd9fe9a6db4ef (commit) from edfa67d26bac695b5ef9911f3cda3ff50232e35a (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 13964f3416ec9de8829b57d4a2bbd9fe9a6db4ef Author: Alexei Sheplyakov <Alexei.Sheplyakov(a)gmail.com> Date: Tue Jul 1 21:46:11 2014 +0300 [bugfix] log_series: avoid infinite recursion Check if the argument is on a branch cut check if it actually depends on the expansion variable before trying to expand around a different point in order to avoid the infinite recursion (or rather a segfault due to a stack overflow). Thanks to Mario Prausa for a bugreport. ----------------------------------------------------------------------- Summary of changes: check/exam_inifcns.cpp | 9 +++++++++ ginac/inifcns_trans.cpp | 4 ++++ 2 files changed, 13 insertions(+), 0 deletions(-) hooks/post-receive -- GiNaC -- a C++ library for symbolic computations

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