This file records noteworthy changes.
-1.2.0 (<insert date>)
+1.3.0 (<insert date>)
+* Fixed infinite recursion in atan2_evalf() and improved atan2_eval().
+* Added automatic evaluations for trigonometric functions with negative
+ arguments (e.g. sin(-2) -> -sin(2)).
+* Fixed a static initialization order goof-up.
+
+1.2.0 (19 March 2004)
* Added a structure<T> template class for the easy creation of user-defined
algebraic classes.
* Added support for (acyclic) visitors, to allow cleaner implementations of
algebraic algorithms.
-* <iterators>
+* Added a const_iterator class that can be used instead of op()/nops().
* Completely revamped the implementation of expression output. It is now
possible to add new output formats, to change the behavior of predefined
formats at run-time, and to have different output styles for algebraic
functions.
* Symbols can be made non-commutative.
-* Complex conjugation available.
+* Added a method ex::conjugate() and a function conjugate() for complex
+ conjugation. Symbols can be declared as real or complex-valued.
* Improved the speed of subs(), normal(), to_rational() and to_polynomial()
by the use of maps instead of lists. The old forms
subs(const lst & ls, const lst & lr, unsigned options)
* quo(), rem(), prem(), sprem(), decomp_rational(), unit(), content(),
primpart() and matrix::charpoly() now take a "const ex &" instead of a
"const symbol &".
-* <object fusion>
+* Redundant expressions (two ex pointing to different objects are found to be
+ equal in compare()) are now actively deleted/fused to conserve memory and
+ speed up subsequent comparisons. This behavior can be suppressed on a
+ per-object level with status_flags::not_shareable. Lists and matrices are
+ not shareable by default.
* Lots of internal streamlining and optimizations.
* Caveats for class implementors:
- basic::copy() and basic::destroy() are gone; classes derived from
- Overloading basic::print() is now deprecated. You should use
print_func<>() class options instead.
+1.1.7 (11 March 2004)
+* Fixed a bug in canonicalize_clifford().
+* Series expansion now works predictably. All terms with the exponent of the
+ expansion variable smaller than the given order are calculated exactly. If
+ the series is not terminating, the Order function is (at least) of the given
+ order.
+
+1.1.6 (22 January 2004)
+* Added a function option "dummy()" which means "no options". This simplifies
+ the implementation of symbolic functions which are not to be further
+ evaluated.
+* Removed a bug in the numerical evaluation of Li() that caused the system
+ to hang for certain parameter combinations.
+* Fixed a bug in the calculation of hash values for indices that could lead
+ to wrong results or bogus error messages from simplify_indexed().
+* Fixed a bug in the evaluation of harmonic polylogarithms for complex
+ arguments with positive imaginary part.
+
+1.1.5 (5 November 2003)
+* Harmonic polylogarithms now numerically evaluate for arbitrary arguments
+ (parameter must still be positive integers).
+* The zeta function now can also be given a lst as a parameter in which case
+ it becomes a multiple zeta value. The use of mZeta is deprecated.
+* The order of parameters for the multiple polylogarithm has been corrected.
+* Documentation for the nested sums functions zeta, harmonic polylog, multiple
+ polylog, etc. has been added.
+
+1.1.4 (17 October 2003)
+* Lists and matrices can now be initialized from comma-separated lists of
+ expressions, like this:
+
+ lst l;
+ l = x, 2, y, x+y;
+
+ matrix M(3, 3);
+ M = x, y, 0,
+ -y, x, 0,
+ 0, 0, 1;
+
+ This is both faster and produces much smaller code than the old constructors
+ lst(ex, ex, ...) and matrix(unsigned, unsigned, lst), especially in the case
+ of matrices, and is now the recommended way to create these objects.
+* The function mZeta now evaluates much faster for arbitrary parameters. The
+ harmonic and multiple polylogarithms evaluate considerably faster and check
+ for convergence. The order of parameters for the harmonic polylogarithm
+ has been corrected.
+
+1.1.3 (22 August 2003)
+* Added new symbolic functions for better integration with nestedsums:
+ (multiple) polylogarithm Li(), Nielsen's generalized polylogarithm S(),
+ harmonic polylogarithm H(), and multiple zeta value mZeta().
+* New exhashmap<T> template intended as a drop-in replacement for
+ std::map<ex, T, ex_is_less> using GiNaC's hashing algorithms.
+
+1.1.2 (11 August 2003)
+* Fixed a bug in the unarchiving of sums and products: terms were not
+ reordered in a canonical way.
+* Fixed a bug in normal()/numer_denom(): denominator was not made unit
+ normal if it was a simple number.
+* Improved the speed of subs() in some cases.
+
+1.1.1 (18 June 2003)
+* lst (and exprseq) provide iterators for read-only element access. For
+ sequential access this is one order faster than using op().
+* Implemented relational::subs() (this was done in 1.0.9 but inadvertently
+ omitted from the 1.1 branch).
+* pole_error and do_taylor are available to library users.
+* Added on-line help and Tab-completion for print(), iprint(), print_latex()
+ and print_csrc() in ginsh.
+
1.1.0 (3 April 2003)
* Removed deprecated macros is_ex_a, is_ex_exactly_a and friends for good.
* The scalar_products mechanism allows the specification of an index dimension.
git://www.ginac.de / ginac.git / blobdiff