added description of wildcards

[ginac.git] / NEWS

diff --git a/NEWS b/NEWS
index 089e06c9445301b974a4569fe7872d4c61cb3dd4..d08e730e48711ef795f7a6e337820f202b3dcf0b 100644 (file)
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+++ b/NEWS
@@ -1,5 +1,18 @@
 This file records noteworthy changes.
 
+0.8.4 (<date>)
+* 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.
+* 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.
+
 0.8.3 (11 May 2001)
 * color and clifford classes are functional and documented.
 * New "spinidx" class for dotted/undotted indices.