X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=NEWS;h=f8902a6092a378f076fcff87a1db9d8e68ad388f;hp=d349c8fa083a54009dd58c74d4e63fbeff38f5c8;hb=5954e1a6b131f6f10c1ed96766af7acbd350d8bb;hpb=dd62f332ed50fd901700d4ff233c171d5f65ff1a

diff --git a/NEWS b/NEWS
index d349c8fa..f8902a60 100644
--- a/NEWS
+++ b/NEWS
@@ -1,12 +1,44 @@
 This file records noteworthy changes.
 
-0.8.4 (<date>)
+0.9.1 (<date>)
+* New functions/methods:
+   - remove_first() and remove_last() for lists
+   - symmetrize_cyclic()
+* 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).
+* color_trace() and dirac_trace() can be applied to a more general class
+  of expressions, e.g. using it on a relation will take the trace on both
+  sides etc.
+* 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.
+
+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".
-* Added canonicalize_clifford() function that can be helpful when comparing
-  expressions containing Dirac matrices.
-* Fixed possible crash when calling subs() on expressions with non-commutative
-  products.
+  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.
@@ -14,7 +46,7 @@ This file records noteworthy changes.
 * 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)