May 2011 - GiNaC-devel

[SCM] GiNaC -- a C++ library for symbolic computations branch, master, updated. release_1-4-0-339-gab1aedf
by git＠ginac.de 19 May '11

19 May '11

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 ab1aedf73a5d062bf50ed1e740f38a4503d7fead (commit) from f9afb6aca6a971650dff63b11ca8c2ef18506690 (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 ab1aedf73a5d062bf50ed1e740f38a4503d7fead Author: Jens Vollinga <jensv(a)nikhef.nl> Date: Thu May 19 09:44:11 2011 +0200 The patch improves the run time at the expense of using more RAM in some situations. Please note: it doesn't improve the actual algorithm (iteration over all permutations). Thanks to Alexei Sheplyakov. ----------------------------------------------------------------------- Summary of changes: ginac/symmetry.cpp | 7 +++++-- 1 files changed, 5 insertions(+), 2 deletions(-) hooks/post-receive -- GiNaC -- a C++ library for symbolic computations

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expairseq::conjugate
by Burcin Erocal 15 May '11

15 May '11

Hi, the following problem (in Sage syntax) was reported to the Sage issue tracker [1]: ginsh - GiNaC Interactive Shell (ginac V1.5.8) <snip> > conjugate(I*sqrt(-3)); -I*sqrt(-3) [1] http://trac.sagemath.org/sage_trac/ticket/10964 The problem seems to be the expair::conjugate() method which is called from the conjugateepvector() function in expairseq.cpp. This function is called from the pseries class as well. So, moving the latter in the expairseq class to use the virtual functions recombine_pair_to_ex() etc. does not work. Any ideas for a clean solution to this? Thank you. Burcin

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[SCM] GiNaC -- a C++ library for symbolic computations branch, master, updated. release_1-4-0-338-gf9afb6a
by git＠ginac.de 15 May '11

15 May '11

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 f9afb6aca6a971650dff63b11ca8c2ef18506690 (commit) from e16348f2f6edb1747dca9e4c47300e0436eea617 (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 f9afb6aca6a971650dff63b11ca8c2ef18506690 Author: Richard Kreckel <kreckel(a)ginac.de> Date: Sun May 15 18:40:44 2011 +0200 Fix mul::conjugate(). Overwrite conjugate() for mul objects because the base class's conjugate function is incorrect at branch cuts when exponents are fractional (roots). This has been reported as Sage #10964. While at it, fix some funny indentation and remove unneeded tests. ----------------------------------------------------------------------- Summary of changes: check/exam_paranoia.cpp | 15 +++++++++++++++ ginac/expairseq.cpp | 4 +--- ginac/expairseq.h | 4 ++-- ginac/inifcns_trans.cpp | 2 +- ginac/mul.cpp | 32 ++++++++++++++++++++++++++++++++ ginac/mul.h | 1 + ginac/pseries.cpp | 6 ++---- 7 files changed, 54 insertions(+), 10 deletions(-) hooks/post-receive -- GiNaC -- a C++ library for symbolic computations

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a clarification regarding the problem with simplify_indexed.
by PG CLARK 14 May '11

14 May '11

In fact the code doesn't even care about the tensor symmetry. This code also fails to terminate. #include <iostream> #include <ginac/ginac.h> using namespace std; using namespace GiNaC; int main() { symbol i_sym("i"), j_sym("j"), k_sym("k"), l_sym("l"), m_sym("m"), n_sym("n"); idx i(i_sym, 2), j(j_sym, 2), k(k_sym, 2), l(l_sym, 2), m(m_sym, 2), n(n_sym, 2); symbol alpha_sym("\\alpha"), beta_sym("\\beta"), gamma_sym("\\gamma"); idx Va(alpha_sym, 3), Vb(beta_sym, 3), Vg(gamma_sym, 3); symbol U1("U1"), U2("U2"), U3("U3"), U4("U4"), U5("U5"), U6("U6"), h("h"); exvector IJKLMNVec; idx IJKLMNIA[] ={i, j, k, l, m, n}; IJKLMNVec.assign (IJKLMNIA,IJKLMNIA+6); ex myEx1 = (indexed(h, IJKLMNVec)*indexed(U1, i, Va)*indexed(U5, m, Vg) *indexed(U3, k, Vb)*indexed(U2, j, Va)*indexed(U4, l, Vb)*indexed(U6, n, Vg)); ex myEx2 = (indexed(h, IJKLMNVec)*indexed(U1, i, Va)*indexed(U1, m, Vg) *indexed(U1, k, Vb)*indexed(U1, j, Va)*indexed(U1, l, Vb)*indexed(U1, n, Vg)); ex myEx3 = (indexed(h, IJKLMNVec)*indexed(U1, i, Va)*indexed(U2, m, Vg) *indexed(U1, k, Vb)*indexed(U2, j, Va)*indexed(U1, l, Vb)*indexed(U2, n, Vg)); // swap comments to see .simplify_indexed() fails in all cases cout << myEx2.simplify_indexed() << endl; //cout << myEx3.simplify_indexed() << endl; //cout << myEx1.simplify_indexed() << endl; return 0; } Could this be an error in simplify_indexed_product? ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program.

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[SCM] GiNaC -- a C++ library for symbolic computations branch, master, updated. release_1-4-0-337-ge16348f
by git＠ginac.de 11 May '11

11 May '11

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 e16348f2f6edb1747dca9e4c47300e0436eea617 (commit) from e7d59ed49503cfe73fdb6038c2c69c87cbde7c24 (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 e16348f2f6edb1747dca9e4c47300e0436eea617 Author: Jens Vollinga <jensv(a)nikhef.nl> Date: Tue May 10 23:44:57 2011 +0200 Updated the news about changes done since the last release (2010-07-06). ----------------------------------------------------------------------- Summary of changes: NEWS | 15 +++++++++++++++ 1 files changed, 15 insertions(+), 0 deletions(-) hooks/post-receive -- GiNaC -- a C++ library for symbolic computations

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