September 2014 - GiNaC-devel

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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Bugfix "commit 97ef604e breaks evaluation of some G-polylogs"
by Stefan Weinzierl 22 Sep '14

22 Sep '14

Hello, the attached patch corrects and supersedes the patches 97ef604e "G_numeric: fix numeric evaluation with trailing zeros and y != 1." and 9e80b0d3 "G_numeric: fix evaluation with y == 1". The original motivation for patch 97ef604e was to make sure that Hoelder convolution is only used if there no trailing zeros. Patch 97ef604e delegated the case of trailing zeros to G_do_trafo, which correctly removes the trailing zeros, but in addition also performed the transformation described in sect. 5.3 of hep-ph/0410259 ("convergence transformation"). The inappropriate call of the convergence transformation is the cause of the new bug reported at http://www.cebix.net/pipermail/ginac-list/2014-September/002011.html The patch 9e80b0d3 cures the symptons mentioned in the above bug report, but fails for other cases, like evalf( G({-2,2,-2,0},2) ). What should be done is the following: If trailing zeros are detected in G_numeric, these should be removed and the result should be returned to G_numeric. The routine G_numeric decides then what to do next: either calling the convergence transformation, or Hoelder convolution or direct summation. What is needed is a subroutine, which just removes trailing zeros, but does not perform the convergence transformation. With the present code the minimal modification to achieve this goal is to add an additional boolean parameter flag_trailing_zeros_only to G_do_trafo (and its dependent sub-routines), so G_do_trafo can be called for the removal of trailing zeros only. The proposed patch implements this and uses G_do_trafo to remove trailing zeros only for the case at hand. Best wishes, Stefan

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[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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