X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=NEWS;h=8c11cffc96ef9a4b3ffb9fbf601c3599f491374a;hp=e69de29bb2d1d6434b8b29ae775ad8c2e48c5391;hb=6d383491ac7fdc612ebc15778a2db01dbc5660d6;hpb=6b3768e8c544739ae53321539cb4d1e3112ded1b diff --git a/NEWS b/NEWS index e69de29b..8c11cffc 100644 --- a/NEWS +++ b/NEWS @@ -0,0 +1,136 @@ +This file records noteworthy changes. + +0.8.0 () +* Complete revamp of indexed objects. Instead of multiple classes for + indexed things and their indices there is now only one "indexed" class + and two types of indices: "idx" for simple indices and "varidx" for + indices with variance. There are predefined delta, epsilon and metric + tensors, and a function simplify_indexed() that performs canonicalization + and dummy index summations. +* Added an option "expand_indexed" to expand() to perform expansion of + indexed objects like (a+b).i -> a.i + b.i +* Renamed get_indices() to get_free_indices(), which no longer returns + dummy indices and checks the consistency of indices in sums. +* sqrfree() factorization fixed and improved syntactically. +* subs() works on matrices. +* Fixed memory leak in expand(). + +0.7.3 (28 February 2001) +* Several bugfixes and minor performance tunings. +* Added a section to the tutorial about adding new algebraic classes to GiNaC. +* Closed many in-source documentation gaps. + +0.7.2 (17 February 2001) +* Several bugfixes in power series expansion, one of them critical. + +0.7.1 (7 February 2001) +* Fix problems with Cint that were caused by CLN's overloaded operator new. +* Fix compilation errors with GCC3. +* normal() handles large sums of fractions better and normalizes the exponent + of power expressions. +* expand() always expands the exponent and transforms x^(a+b) -> x^a*x^b. +* Some bugfixes of series expansion around branch cuts of special functions. + +0.7.0 (15 December 2000) +* Requires CLN 1.1 now. Class numeric doesn't use an indirect pointer to the + actual representation any more. This is a speedup. +* mul::expand() was reengineered to not allocate excess temporary memory. +* Non-integer powers of a symbol are treated as constants by (l)degree() and + coeff(). Using these functions on an expression containing such powers used + to fail with an internal error message. The side-effect is that collect() + can be used on expressions which are not polynomials. +* Added a man page for the ginac-config script. +* Ctor of numeric from char* honors Digits. + +0.6.4 (10 August 2000) +* Complete revamp of methods in class matrix. Some redundant (and poor) + implementations of elimination schemes were thrown out. The code is now + highly orthogonal, more flexible and much more efficient. +* Some long standing and quite nasty bugs were discovered and fixed in the + following functions: add::normal(), heur_gcd(), sr_gcd() and Order_eval(). + +0.6.3 (25 July 2000) +* Derivatives are now assembled in a slightly different manner (i.e. they + might 'look' different on first sight). Under certain circumstances this + can result in a dramatic speedup because it gives hashing a better chance, + especially when computing higher derivatives. +* Some series expansions of built-in functions have been reengineered. +* The algorithm for computing determinants can be chosen by the user. See + ginac/flags.h and ginac/matrix.h. +* The Dilogarithm (Li2) now has floating point evaluation, derivative and a + proper series expansion. +* Namespace 'std' cleanly disentangled, as demanded by ISO/EIC 14882-1998(E). +* Some minor bugfixes, one major lsolve()-bugfix and documentation updates. + +0.6.2 (21 June 2000) +* ginaccint.bin is now launched by a binary program instead of by a scripts. + This allows us to write #!-scripts. A small test suite for GiNaC-cint was + added. +* Several minor bugfixes. + +0.6.1 (18 May 2000) +* Cleanup in the interface to Cint. The required version is now Cint 5.14.38. +* Several bugfixes in target install. + +0.6.0 (11 May 2000) +* IMPORTANT: Several interface changes make programs written with GiNaC + much clearer but break compatibility with older versions: + - f(x).series(x,p[,o]) -> f(x).series(x==p,o) + - series(f(x),x,p[,o]) -> series(f(x),x==p,o) + - gamma() -> tgamma() (The true Gamma function, there is now also + log(tgamma()), called lgamma(), in accord with ISO/IEC 9899:1999.) + - EulerGamma -> Euler +* #include'ing ginac.h defines the preprocessor symbols GINACLIB_MAJOR_VERSION, + GINACLIB_MINOR_VERSION, and GINACLIB_MICRO_VERSION with the respective GiNaC + library version numbers. +* Expressions can be constructed from strings like this: + ex e("2*x+y", lst(x, y)); +* ex::to_rational() provides a way to extend the domain of functions like + gcd() and divide() that only work on polynomials or rational functions (the + good old ex::subs() method reverses this process) +* Calling diff() on a function that has no derivative defined returns the + inert derivative function "Derivative". +* Several new timings in the check target. Some of them may be rather rude + at your machine, feel free to interrupt them. + +0.5.4 (15 March 2000) +* Some algorithms in class matrix (notably determinant) were replaced by + less brain-dead ones and should now have much better performance. +* Checks were completely reorganized and split up into three parts: + a) exams (small regression tests with predefined input) + b) checks (lenghty coherence checks with random input) + c) timings (for coherence and crude benchmarking) +* Behaviour of .evalf() was changed: it doesn't .evalf() any exponents. +* Expanded expressions now remember they are expanded to prevent + superfluous expansions. +* Small bugfixes and improvements in the series expansion. + +0.5.3 (23 February 2000) +* A more flexible scheme for registering functions was implemented, + allowing for remembering, too. +* Some Bugfixes. + +0.5.2 (16 February 2000) +* Mainly fixes a bug in the packaging of release 0.5.1. + +0.5.1 (14 February 2000) +* Fixes a small number of bugs. + +0.5.0 (7 February 2000) +* Expressions can be written ("archived") to files and read therefrom. +* Addition of GiNaC-cint, which lets you write complete programs in + an interactive shell-like manner in your favoured programming + language (i.e. C++). + +0.4.1 (13 December 1999) +* Series Expansion of Gamma function and some other trigonometric + functions at their poles works now. +* Many more evaluations of special functions at points where + exact results exist. +* info_flags::rational doesn't return true for complex extensions + any more---use info_flags::crational for the old behaviour. + info_flags::integer and -::cinteger work similarly, the same + holds for types like info_flags::rational_polynomial. + +0.4.0 (26 November 1999) +* First public release.