X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=NEWS;h=52f9a4c6699ebc3999312ed4bb253eb60dbecf35;hp=4ff432d004df07268675f8d0223fa02ed269d4a8;hb=abc868b70eea6e434130c4d8d9916ae8f55db370;hpb=6a050869057036805a731bdfe627fda7521131a0

diff --git a/NEWS b/NEWS
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+++ b/NEWS
@@ -1,9 +1,88 @@
 This file records noteworthy changes.
 
-0.8.3 (<date>)
+0.9.5 (<date>)
+* Some internal reorganization resulting in a general speed-up.
+
+0.9.4 (20 September 2001)
+* Functions have better support for external scripting languages.
+* Interface cleanups and bugfixes.
+* Fix silly bug in evalf() that prevented things like 2^Pi being computed.
+
+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.
-* Fix some build-problems (with recent libreadline).
+* Fixed some build problems (with recent libreadline).
 * Semantics of arithmetic operators now follows the C++ rules more strictly.
 
 0.8.2 (24 April 2001)