- insert date.

[ginac.git] / NEWS

diff --git a/NEWS b/NEWS
index 203bd6e497cbeade4fd82611cbf02533fa116556..3788916df20a5f497c3833eb12439d9513916762 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -1,10 +1,27 @@
 This file records noteworthy changes.
 
-0.8.4 (<date>)
+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".
-* 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.
@@ -12,7 +29,7 @@ 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)