X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?a=blobdiff_plain;f=NEWS;h=3234725c22f773cf82117906b689129e9efeef39;hb=c16c3a44e91e684797a04113e41362f02a0d367a;hp=19c647ca933e864abccb7f17dd25a30bb78f8928;hpb=c06c3bd06e86e41ec5905b3fce42ba148b9fd85b;p=ginac.git

diff --git a/NEWS b/NEWS
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@@ -1,5 +1,33 @@
 This file records noteworthy changes.
 
+0.8.0 (<date>)
+* Complete revamp of indexed objects. Instead of multiple classes for
+  indexed things and their indices there is now only one "indexed" class
+  and two types of indices: "idx" for simple indices and "varidx" for
+  indices with variance. There are predefined delta, epsilon and metric
+  tensors, and a function simplify_indexed() that performs canonicalization
+  and dummy index summations. Matrix objects can be indexed for doing simple
+  linear algebra.
+* Added an option "expand_indexed" to expand() to perform expansion of
+  indexed objects like (a+b).i -> a.i + b.i
+* Renamed get_indices() to get_free_indices(), which no longer returns
+  dummy indices and checks the consistency of indices in sums.
+* sqrfree() factorization fixed and improved syntactically.
+* subs() works on matrices.
+* Matrices can be constructed from flat list of elements; diagonal matrices
+  can be constructed from list of diagonal elements with diag_matrix()
+* Fixed memory leak in expand().
+* Operator% for objects of class ncmul has gone.  Use operator* now for that
+  case too, which is much more natural.
+
+0.7.3 (28 February 2001)
+* Several bugfixes and minor performance tunings.
+* Added a section to the tutorial about adding new algebraic classes to GiNaC.
+* Closed many in-source documentation gaps.
+
+0.7.2 (17 February 2001)
+* Several bugfixes in power series expansion, one of them critical.
+
 0.7.1 (7 February 2001)
 * Fix problems with Cint that were caused by CLN's overloaded operator new.
 * Fix compilation errors with GCC3.