This file records noteworthy changes.
-0.8.2 (<date>)
+0.9.4 (<insert date>)
+* Functions have better support for external scripting languages.
+* Interface cleanups and bugfixes.
+
+0.9.3 (16 August 2001)
+* series expansion now much more consistent for small order expansion.
+* lsolve() accepts algorithmic hint as parameter.
+
+0.9.2 (31 July 2001)
+* Epsilon tensor is more functional.
+* simplify_indexed() is better at detecting expressions that vanish for
+ symmetry reasons.
+* Several little bugfixes and consistency enhancements.
+
+0.9.1 (27 June 2001)
+* Ctors of class numeric are not explicit any more. All built-in callers for
+ pseudofunctions are now templated and default to ex arguments which relaxes
+ the need for explicit ctors.
+* New functions/methods:
+ - find()
+ - remove_first(), remove_last(), sort() and unique() for lists
+ - symmetrize_cyclic()
+ - decomp_rational()
+* Instead of just totally symmetric or antisymmetric, complex symmetries
+ can now be defined for indexed objects. Symmetries are described by a
+ tree of "symmetry" objects that is constructed with the sy_none(),
+ sy_symm(), sy_anti() and sy_cycl() functions. The symmetry of a function
+ with respect to its arguments can also be defined (this is currently
+ only used for the Beta function).
+* Generalized map() to take a function object instead of a function pointer.
+ This allows passing an arbitrary number of additional state to the
+ function being called.
+* color_trace(), dirac_trace(), diff(), expand(), evalf() and normal() work
+ better with container classes, e.g. using color_trace() on a relation will
+ take the trace on both sides, using diff() on a matrix differentiates every
+ element etc.
+* diff() works properly with non-commutative products and indexed objects.
+* New option flag "expand_function_args" for expand().
+* Supplement some (now deprecated) macros by inlined template functions:
+ - is_of_type(foo, type) -> is_a<type>(foo)
+ - is_ex_of_type(foo, type) -> is_a<type>(foo)
+ - is_exaclty_of_type(foo, type) -> is_exaclty_a<type>(foo)
+ - is_ex_exaclty_of_type(foo, type) -> is_exaclty_a<type>(foo)
+ - ex_to_foobar(baz) -> ex_to<foobar>(baz)
+* rem(c, p[x], x) (c: numeric, p[x]: polynomial) erroneously returned p[x]
+ instead of c.
+* Small bugfixes in pattern matching.
+* Updated libtool to version 1.4.
+
+0.9.0 (7 June 2001)
+* In the output and in ginsh, lists are now delimited by { } braces, and
+ matrices are delimited by single [ ] brackets.
+* simplify_indexed() renames dummy indices so, e.g., "a.i*a.i+a.j*a.j" gets
+ simplified to "2*a.i*a.i" (or "2*a.j*a.j").
+* New functions/methods:
+ - canonicalize_clifford() (helpful when comparing expressions containing
+ Dirac matrices)
+ - symmetrize() and antisymmetrize()
+ - numer_denom() (return numerator and denominator in one call)
+ - map() (apply function to subexpressions)
+ - evalm() (evaluate sums, products and integer powers of matrices)
+* Added a new function match() for performing pattern matching. subs() and
+ has() also accept patterns as arguments. A pattern can be any expression,
+ optionally containing wildcard objects. These are constructed with the
+ call "wild(<unsigned>)" and are denoted as "$0", "$1" etc. in the output
+ and in ginsh.
+* Positive integer powers of non-commutative expressions (except matrices)
+ are automatically expanded.
+* Removed cint subdirectory, ginaccint is a separate package now due to
+ packaging considerations.
+* Several little bugfixes.
+
+0.8.3 (11 May 2001)
+* color and clifford classes are functional and documented.
+* New "spinidx" class for dotted/undotted indices.
+* Predefined spinor metric tensor (created by spinor_metric()).
+* Symbols can have a LaTeX name, e.g. symbol s("s", "\\sigma");
+* LaTeX output of indexed objects is much nicer.
+* Fixed some build problems (with recent libreadline).
+* Semantics of arithmetic operators now follows the C++ rules more strictly.
+
+0.8.2 (24 April 2001)
* degree(), ldegree(), coeff(), lcoeff(), tcoeff() and collect() work with
non-symbols as the second argument in ginsh.
* the argument to collect() can be a list of objects in which case the
result is either a recursively collected polynomial, or a polynomial in
a distributed form with terms like coeff*x1^e1*...*xn^en, as specified by
the second argument to collect().
+* Several bugfixes (including a nasty memory leak in .normal()).
+* class matrix: solve() doesn't call algorithms redundantly any more and
+ inverse() falls back to solve() which works in more general cases.
0.8.1 (16 April 2001)
* degree(), ldegree(), coeff(), lcoeff(), tcoeff() and collect() can now
git://www.ginac.de / ginac.git / blobdiff