1 This file records noteworthy changes.
4 * Non-integer powers of a symbol are treated as constants by (l)degree() and
5 coeff(). Using these functions on an expression containing such powers used
6 to fail with an internal error message. The side-effect is that collect()
7 can be used on expressions which are not polynomials.
8 * Added a man page for the ginac-config script.
10 0.6.4 (10 August 2000)
11 * Complete revamp of methods in class matrix. Some redundant (and poor)
12 implementations of elimination schemes were thrown out. The code is now
13 highly orthogonal, more flexible and much more efficient.
14 * Some long standing and quite nasty bugs were discovered and fixed in the
15 following functions: add::normal(), heur_gcd(), sr_gcd() and Order_eval().
18 * Derivatives are now assembled in a slightly different manner (i.e. they
19 might 'look' different on first sight). Under certain circumstances this
20 can result in a dramatic speedup because it gives hashing a better chance,
21 especially when computing higher derivatives.
22 * Some series expansions of built-in functions have been reengineered.
23 * The algorithm for computing determinants can be chosen by the user. See
24 ginac/flags.h and ginac/matrix.h.
25 * The Dilogarithm (Li2) now has floating point evaluation, derivative and a
26 proper series expansion.
27 * Namespace 'std' cleanly disentangled, as demanded by ISO/EIC 14882-1998(E).
28 * Some minor bugfixes, one major lsolve()-bugfix and documentation updates.
31 * ginaccint.bin is now launched by a binary program instead of by a scripts.
32 This allows us to write #!-scripts. A small test suite for GiNaC-cint was
34 * Several minor bugfixes.
37 * Cleanup in the interface to Cint. The required version is now Cint 5.14.38.
38 * Several bugfixes in target install.
41 * IMPORTANT: Several interface changes make programs written with GiNaC
42 much clearer but break compatibility with older versions:
43 - f(x).series(x,p[,o]) -> f(x).series(x==p,o)
44 - series(f(x),x,p[,o]) -> series(f(x),x==p,o)
45 - gamma() -> tgamma() (The true Gamma function, there is now also
46 log(tgamma()), called lgamma(), in accord with ISO/IEC 9899:1999.)
48 * #include'ing ginac.h defines the preprocessor symbols GINACLIB_MAJOR_VERSION,
49 GINACLIB_MINOR_VERSION, and GINACLIB_MICRO_VERSION with the respective GiNaC
50 library version numbers.
51 * Expressions can be constructed from strings like this:
52 ex e("2*x+y", lst(x, y));
53 * ex::to_rational() provides a way to extend the domain of functions like
54 gcd() and divide() that only work on polynomials or rational functions (the
55 good old ex::subs() method reverses this process)
56 * Calling diff() on a function that has no derivative defined returns the
57 inert derivative function "Derivative".
58 * Several new timings in the check target. Some of them may be rather rude
59 at your machine, feel free to interrupt them.
62 * Some algorithms in class matrix (notably determinant) were replaced by
63 less brain-dead ones and should now have much better performance.
64 * Checks were completely reorganized and split up into three parts:
65 a) exams (small regression tests with predefined input)
66 b) checks (lenghty coherence checks with random input)
67 c) timings (for coherence and crude benchmarking)
68 * Behaviour of .evalf() was changed: it doesn't .evalf() any exponents.
69 * Expanded expressions now remember they are expanded to prevent
70 superfluous expansions.
71 * Small bugfixes and improvements in the series expansion.
73 0.5.3 (23 February 2000)
74 * A more flexible scheme for registering functions was implemented,
75 allowing for remembering, too.
78 0.5.2 (16 February 2000)
79 * Mainly fixes a bug in the packaging of release 0.5.1.
81 0.5.1 (14 February 2000)
82 * Fixes a small number of bugs.
84 0.5.0 (7 February 2000)
85 * Expressions can be written ("archived") to files and read therefrom.
86 * Addition of GiNaC-cint, which lets you write complete programs in
87 an interactive shell-like manner in your favoured programming
90 0.4.1 (13 December 1999)
91 * Series Expansion of Gamma function and some other trigonometric
92 functions at their poles works now.
93 * Many more evaluations of special functions at points where
95 * info_flags::rational doesn't return true for complex extensions
96 any more---use info_flags::crational for the old behaviour.
97 info_flags::integer and -::cinteger work similarly, the same
98 holds for types like info_flags::rational_polynomial.
100 0.4.0 (26 November 1999)
101 * First public release.