- GiNaC-list - ginac.de

GiNaC 1.1 API freeze
by Christian Bauer 19 Mar '03

19 Mar '03

Hi! We plan to release GiNaC 1.1.0 by the end of next week. It will become the new "stable" branch, and any new and exciting experimental stuff will then go into 1.2. Further development of 1.0.x will be limited to bugfixes. The idea is to keep the programming interfaces compatible across all versions of 1.1.x, as it has been the case for 1.0.x, so should there be anyone who has cause why the current 1.1 CVS should not become the 1.1 release version (suggestions for parameter/return type changes, useful additional methods etc.), they must speak now or forever hold their peace. Bye, Christian -- / Coding on PowerPC and proud of it \/ http://www.uni-mainz.de/~bauec002/

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Problems with linking GiNaC
by paul81＠webb.de 17 Mar '03

17 Mar '03

Hello, I'm new to GiNaC. In fact I've just installed the Debian package. But when I tried to compile the examples given in the section "A Tour of GiNaC" in the info pages it won't work. The object file is correctly made; but the linking process just returns a lot of errors. I used the command g++ $(ginac-config --libs) example.c++ ld returns many error messages (too much to send them). Basicly there two types. First many messages like example.o(.text+0x47): In function `main': : undefined reference to `GiNaC::symbol::symbol[in-charge](std::basic_string<char, std::char_traits<char>, std::allocator< char> > const&)' And for (I think) every reference in the object file. And second there also messages like: /usr/lib/libginac.so: undefined reference to `cerr' /usr/lib/libginac.so: undefined reference to `cln::compare(cln::cl_R const &, cln::cl_R const &)' (Very much of them, too). I have checked ginac-config. It seems to report the right libraries. When I tried static linking some of the messages disappeared, but only a few. Can anyone tell me, how I can get those examples run? Thank in advance, Paul PS: My systems configuration: g++ (GCC) 3.2.3 20030309 (Debian prerelease) GiNaC 1.0.11-1 (the debian packages: libginac-dev 1.0.11-1 & libginac0 1.0.11-1) CLN 1.1.5-1 (Debian: libcln2 1.1.5-1) and Debian GNU/Linux 2.4.17

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here we go...
by Richard B. Kreckel 01 Mar '03

01 Mar '03

This is to let folks know that Christian Bauer-san has just rolled the release of GiNaC-1.0.14 of which the only thing we know is that it works for him (tm). Can't ask him any more details. He just left the room. Hope he's fetching the champagne. Wait, I can do better and cite the NEWS file: * Improved the C-source output: complex numbers are printed correctly (using the STL complex<> template or cln::complex()), rational numbers use cl_RA() in the CLN output, and small integers are printed in a more compact format (e.g. "2.0" instead of "2.0000000e+00"). * function_options::set_return_type() and function_options::do_not_evalf_params() now actually work. Enjoy -richy. -- Richard B. Kreckel <Richard.Kreckel(a)GiNaC.DE> <http://www.ginac.de/~kreckel/>

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matrices and expressions
by Johan Rutgeerts 27 Feb '03

27 Feb '03

Hi, I only just started using ginac and there's some things about matrices and their relation to expressions that I do not understand. As for instance: why does GiNaC::unity_matrix return a GiNaC::ex ? or why does A + B with A and B both a GiNaC::matrix return a GiNaC::ex? And how do I convert such a GiNaC::ex to a matrix? Can this be done? Greetings, Johan Rutgeerts

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Differentiating matrix/vector expressions
by junk2＠microserf.org.uk 24 Feb '03

24 Feb '03

Hi I've had a trawl around the ginac site, and it's not obvious that ginac supports operations on matrix/vector expressions (particularly differentiation). Although it's clear that matrices and vectors are supported, can I perform a differentiation on a matrix or vector expression? Cheers

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Can't compile
by Ricardo Cervera 19 Feb '03

19 Feb '03

Hello. I would be very pleased if you could help me since I can't compile GiNaC. It keeps asking for CLN when doing ./configure, although think it is well installed: *** The test program compiled, but did not run... Could you please give me any advice? Thanks a lot.

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xloops
by Iain 07 Feb '03

07 Feb '03

Hi, What is happening with the port of xloops to GiNaC? Who, if anyone is working on it? -I __________________________________________________ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com

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GiNaC 1.0.13 now available
by Christian Bauer 27 Jan '03

27 Jan '03

Hello! The GiNaC Development Group (which is effectively reduced to one member now) wishes everybody a Happy New Year (belatedly) and a Happy <insert-your- favorite-religiously-motivated-around-new-year-celebration-here>, and is proud to present GiNaC 1.0.13, the latest in C++-based made-for-physicists- but-useful-for-other-people-too computer algebra library technology. Now with these exciting new features: * Contracting epsilon tensors with Euclidean indices now works. * Improved dummy index symmetrization in sums. * Added dirac_gammaL/R(), which can be used instead of dirac_gamma6/7() but are single objects, to allow for a more compact notation of Dirac strings. * Powers with negative numeric exponents are printed as fractions in the LaTeX output. * Added symbolic_matrix() for the convenient creation of matrices filled with symbols. * Added collect_common_factors() which collects common factors from the terms of sums. * simplify_indexed() converts "gamma~mu*p.mu" to "p\". As usual, it's available from our FTP server: ftp://ftpthep.physik.uni-mainz.de/pub/GiNaC Happy computing, Christian -- / Coding on PowerPC and proud of it \/ http://www.uni-mainz.de/~bauec002/

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Problem with symbol's default constructor?
by Roberto Bagnara 21 Jan '03

21 Jan '03

Hi all, there seems to be a problem with the default constructor of GiNaC::symbol. Here is a program that shows what happens: #include <ginac/ginac.h> #include <iostream> int main() { GiNaC::symbol s; std::cout << s << std::endl; } If this is executed under, e.g., emacs, it prints symbol0^@ that is, a NUL (ASCII 0) character is printed just after "symbol0". This is probably caused by the presence of " << std::end" in the following template function: template<class T> std::string ToString(const T & t) { std::ostringstream buf; buf << t << std::ends; return buf.str(); } IMHO, " << std::ends" should be simply erased. All the best Roberto -- Prof. Roberto Bagnara Computer Science Group Department of Mathematics, University of Parma, Italy http://www.cs.unipr.it/~bagnara/ mailto:bagnara@cs.unipr.it

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behaviour of find method.
by Chris Dams 06 Jan '03

06 Jan '03

Hello everybody, I found out that the behaviour of the find method is not quite as advertised in the tutorial. The tutorial says: @example bool ex::find(const ex & pattern, lst & found); @end example works a bit like @code{has()} but it doesn't stop upon finding the first match. Instead, it appends all found matches to the specified list. Appending means adding at the end. However, the code of the ex::find() method includes the lines if (match(pattern)) { found.append(*this); found.sort(); found.unique(); return true; } This sorts the found-list so that a match will most of the time not end up at the end, not to mention what happens to any ordering of elements the found list had before calling the find() method. I would guess that this is because this implementation comes with potentially huge memory savings at the cost of speed because of uniquing after every object found. If this is the case, I can understand the implementation, but still the tutorial should describe the true behaviour. Groetjes, Chris

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