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
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+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.