- GiNaC-list - ginac.de

GiNaC 1.3.0
by Jens Vollinga 14 Nov '04

14 Nov '04

Hi, GiNaC 1.3.0 is out and available. The changes are: - No funny announcements anymore. - The Clifford classes have been generalized to allow working with Clifford algebras generated by arbitrary symmetric tensors or matrices. Also, a lot of new functions for Clifford algebras have been added, including automorphisms and Moebius transformations. [Contribution by V. Kisil] - Added some basic symbolic and numeric integration facilities. [Contribution by C. Dams] - The multiple polylogarithm Li() now evaluates numerically for arbitrary arguments. - New functions G(a,y) and G(a,s,y) added (another notation for multiple polylogarithms). As always, this release can be downloaded from ftp://ftpthep.physik.uni-mainz.de/pub/GiNaC/ Enjoy, Jens

3 3

Re: [GiNaC-list] code: extended gcd
by CRAIGHS＠Nationwide.com 08 Nov '04

08 Nov '04

Okay. Ralf Stephan <ralf(a)ark.in-berlin.de> T To: ginac-list(a)zino.physik.uni-mainz.de Sent by: cc: ginac-list-admin(a)zino.phys ik.uni-mainz.de bcc: Subject: Re: [GiNaC-list] code: extended gcd 11/08/2004 01:49 PM Please respond to ginac-list > The Yap book is now unavailable on the web. No, the ftp server is a bit peculiar. Just try a few times. _______________________________________________ GiNaC-list mailing list GiNaC-list(a)ginac.de http://thep.physik.uni-mainz.de/mailman/listinfo/ginac-list

1 0

Re: [GiNaC-list] code: extended gcd
by CRAIGHS＠Nationwide.com 08 Nov '04

08 Nov '04

The Yap book is now unavailable on the web.

2 1

Inverse of complex matrix
by Jonathan Brandmeyer 05 Nov '04

05 Nov '04

Sometimes, inverting a matrix with complex values does not produce something that, when multiplied by the original, returns the identity. I have attached a program that demonstrates this for one case, which was found by altering checks/check_matricies.cpp to use complex values from sparse_tree(). Is this a known problem? Thanks, -Jonathan Brandmeyer P.S: GiNaC 1.3.0, G++ 3.3.4+ (Debian), CLN 1.1.8, Debian Sid on i386

3 2

An Example of Clifford Algebras Calculations with GiNaC
by Vladimir Kisil 19 Oct '04

19 Oct '04

Hi, I put at arXiv.org 'An Example of Clifford Algebras Calculations with GiNaC'. The link to paper is http://arxiv.org/abs/cs.MS/0410044 and abstract is given below. Best wishes, Vladimir -- Vladimir V. Kisil email: kisilv(a)maths.leeds.ac.uk -- www: http://maths.leeds.ac.uk/~kisilv/ ------------------------------------------------------------------------------ \\ Title: An Example of Clifford Algebras Calculations with GiNaC Authors: Vladimir V. Kisil Comments: 20 pages, LaTeX2e, 12 PS graphics in one figure Report-no: LEEDS-MATH-PURE-2004-18 Subj-class: Mathematical Software; Computational Geometry; Graphics; Symbolic Computation \\ This example of Clifford algebras calculations uses GiNaC (http://www.ginac.de/) library, which includes a support for generic Clifford algebra starting from version~1.3.0. Both symbolic and numeric calculation are possible and can be blended with other functions of GiNaC. This calculations was made for the paper math.CV/0410399. Due to course described features of GiNaC should propagate into other software like GNU Octave (http://www.octave.org/) and gTybalt (http://www.fis.unipr.it/~stefanw/gtybalt.html) which uses GiNaC library as a back-end. \\

1 0

GiNaC 1.2.4
by Jens Vollinga 12 Oct '04

12 Oct '04

Hi, GiNaC 1.2.4 is out and available. The changes are: - Added ex::unitcontprim() to compute the unit, content, and primitive parts of a polynomial in one go. - binomial(n, k) evaluates for non-integer arguments n. - Li(2,x) now evaluates for +-I. - Optimized Li(2,x). - Fixed bug in Li(n,x) (if Li(2,x) was calculated with high precision the enlargement of the look-up table caused a segmentation fault). - Fixed another bug in the series expansion of powers, and a bug in power::info(). As always, this release can be downloaded from ftp://ftpthep.physik.uni-mainz.de/pub/GiNaC/ Enjoy, Jens

1 0

bug in series expansion of powers
by varg＠thsun1.jinr.ru 06 Oct '04

06 Oct '04

Hello! This simple program #include <iostream> #include <ginac/ginac.h> using namespace std; using namespace GiNaC; int main(int argc, char** argv) { symbol x("x"); symbol a("a"); symbol b("b"); ex test = pow(x+a,b); cout << test << " = " << test.series(x,3) << endl; return 0; } gives (x+a)^b = 1+Order(x^3) instead of (x+a)^b = (a^b)+(a^b*b*a^(-1))*x+(1/2*a^b*b^2*a^(-2)-1/2*a^b*b*a^(-2))*x^2+Order(x^3) Attached patch fix this bug.

2 1

GiNaC Application: Ecco
by Kai Ludwig 06 Oct '04

06 Oct '04

Hi Folks, thanks to the GiNaC library, we developped the kinetic facilities of Ecco - A Compiler for (Electro-)Chemistry. GiNaC enables the support of so called 'generic rate laws' that can be used to model any rate expression for the simulation of chemical and/or electrochemical reaction kinetics. Thanks to you all!! Kai -- http://echempp.sourceforge.net Kai Ludwig Institut für Organische Chemie Auf der Morgenstelle 18 72076 Tübingen Tel.: 07071/29-73049 Mail: kai.ludwig(a)uni-tuebingen.de

2 1

patch: put ginac.pc into libginac-dev
by varg＠thsun1.jinr.ru 06 Oct '04

06 Oct '04

Hello! This small patch slightly changes packaging rules to get ginac.pc included into libginac-dev. Best regards, Alexei.

2 1

var list
by Ralf Stephan 05 Oct '04

05 Oct '04

This must be a faq: Is there a function that returns a lst of all variables in an ex? Or, what's wrong with the following (which leaves symbols empty)? class CollectSymbols_Visitor : public visitor, public symbol::visitor { public: lst symbols; CollectSymbols_Visitor() {} void visit (const symbol& x) { for (lst::const_iterator i = symbols.begin(); i != symbols.end(); i++) if (*i == x) return; symbols.append(x); } }; int main() { symbol x("x"); ex e = x - 2; CollectSymbols_Visitor collector; e.accept (collector); const lst& sym = collector.symbols; cout << sym << endl; }

2 2