- ++version_major.

[ginac.git] / NEWS

diff --git a/NEWS b/NEWS
index 089e06c9445301b974a4569fe7872d4c61cb3dd4..af7ec2202cb0764b49703ca437aea3fa6b13e996 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -1,12 +1,35 @@
 This file records noteworthy changes.
 
+0.9.0 (<date>)
+* 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".
+* New functions/methods:
+   - canonicalize_clifford() (helpful when comparing expressions containing
+     Dirac matrices)
+   - symmetrize() and antisymmetrize()
+   - numer_denom() (return numerator and denominator)
+   - map() (apply function to subexpressions)
+   - evalm() (evaluate sums and products 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.
+* Fixed possible crash when calling subs() on expressions with non-commutative
+  products.
+* Positive integer powers of non-commutative expressions are automatically
+  expanded.
+* 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)