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.
git://www.ginac.de / ginac.git / blobdiff