- GiNaC-devel - ginac.de

Re: [GiNaC-list] pseries patch
by Vladimir Kisil 12 Feb '07

12 Feb '07

Dear Alexei, ASh> I propose this patch instead: Yes, this is better, but ASh> + if (eb.info(rational_function)) should it be like that: + if (eb.info(info_flags::rational_function)) Best wishes, Vladimir -- Vladimir V. Kisil email: kisilv(a)maths.leeds.ac.uk -- www: http://maths.leeds.ac.uk/~kisilv/

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Less indices in epxressions.
by Chris Dams 07 Feb '07

07 Feb '07

Dear all, I already mentioned this idea quite a few years ago, but I think it really would be good to have. The idea is to turn contractions of an object with something else that has a single index into one object. A new notation for the output would be necessary for this and I guess using a colon would not be bad. That way we would get A~mu~nu*v.mu*w.nu -> A:v:w. The advantages are: * More compact expressions, hence more efficient to store; * More efficient to manipulate because functions like simplify_indexed would have fewer indices to rename. Not to mention automatic dummy index renaming. * More readable output, because if the factors in the example just-given end up somewhere near the beginning of a large product, somewhere near the middle and somewhere near the end it realy isn't readable. Also a notation for the inner product would be necessary. I think something like v:w or maybe inp(v,w) would be nice. I think in the case of a contraction with a tensor I could simply add a flag to the class idx that indicates whether the index is really an index or is a contraction. The point is that we should still store the dimension in the case one is doing dimensional regularization. What do you think? Chris

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No more exit from numeric.cpp
by Chris Dams 07 Feb '07

07 Feb '07

Dear all, I now removed the exit-statements from numeric.cpp and use again array indices instead of push backs for the Lanczos coefficients. That way it should be clear enough from the indices if somebody by incident deletes a line somewhere. Best wishes, Chris

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Release of GiNaC 1.3.7
by Jens Vollinga 05 Feb '07

05 Feb '07

Hello everybody, GiNaC 1.3.7 is out and available. The changes are: - Fixed bug in expansion of power. - Fixed bugs in functions S() (infinite loop), H() and zeta() (wrong results). - Rebuilt bison related files with bison version 2.3 (fixes parse error bugs). - Improved power::eval(). - Improved libreadline detection. As always, this release can be downloaded from http://www.ginac.de/Download.html Best wishes, Jens

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upcoming release
by Jens Vollinga 05 Feb '07

05 Feb '07

Dear all, I am now starting to do the 1.3.7 release. @Alexei: I put your patch into CVS. Thanks! Regards, Jens

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Fixed bug in power::expand_mul, but .....
by Chris Dams 01 Feb '07

01 Feb '07

Dear all, I fixed a bug in power::expand_mul by calling the method mul::combine_pair_with_coeff_to_pair from this function. However, the comments are strongly discouraging. They say, as you can read in the source: "it is safe not to call mul::combine_pair_with_coeff_to_pair() since n is an integer". So, basically I am rather rudely ignoring the comments, but I really don't understand what is unsafe about this method, so maybe someone can enlighten me. Many thanks, Chris

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Belated Happy New Year(s)!
by Richard B. Kreckel 31 Jan '07

31 Jan '07

Hi, IANAL, but I have sed'ed the years in the copyright notices. The copyright notice reads "Copyright 1996-2007 Johannes Gutenberg University Mainz, Germany", followed by the GPL disclaimer. This may be odd since the last contributions were all made by people not affiliated to Mainz University. Personally, I'm not there any more either but don't care, since I think it's the license that matters. Anyway, if any of the contributors is having qualms about that notice, please speak up and propose an alternative Copyright notice. happy hacking -richy. -- Richard B. Kreckel <http://www.ginac.de/~kreckel/>

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Improvements for the code for the Lanczos method.
by Chris Dams 24 Jan '07

24 Jan '07

Dear all, I now implemented the improvements to the code for the Lanczos method as have been discussed during December 2006. You find them in CVS. Best wishes for the not-so-new-anymore year, Chris

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release 1.3.6
by Jens Vollinga 14 Dec '06

14 Dec '06

Dear all, I am about to release 1.3.6 this evening (or later ... ;-) ). Please have a look at the NEWS file and the last minute submissions I did and tell me if you find something missing or wrong. @Alexei: I had to apply two of your patches manually, because the format was somehow broken. I hope I did everything correctly. @Richy: I'd like to include Chris' numerical evaluation of tgamma and friends. It's just another class added, so I think it is okay to be included because the ABI doesn't change. But because of bad experience in the past I'd like to ask you again to be sure. Regards, Jens

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Release of GiNaC 1.3.6
by Jens Vollinga 13 Dec '06

13 Dec '06

Hello everybody, GiNaC 1.3.6 is out and available. The changes are: - Better worst case behavior in heuristic gcd. - Improved collecting for sparse multivariate polynomials. - Improved collect_common_factors. - Fixed bug in numerical evaluation of multiple polylogs. - Fixed numerical integration of complex functions. - Fixed bug in tensor::replace_contr_index(). As always, this release can be downloaded from http://www.ginac.de/Download.html Best wishes, Jens

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