This file records noteworthy changes.
0.6.5 ()
* 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.
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.