This file records noteworthy changes.
-0.7.1 (--date--)
+0.8.3 (<date>)
+* Fix some build-problems (with recent libreadline).
+
+0.8.2 (24 April 2001)
+* degree(), ldegree(), coeff(), lcoeff(), tcoeff() and collect() work with
+ non-symbols as the second argument in ginsh.
+* the argument to collect() can be a list of objects in which case the
+ result is either a recursively collected polynomial, or a polynomial in
+ a distributed form with terms like coeff*x1^e1*...*xn^en, as specified by
+ the second argument to collect().
+* Several bugfixes (including a nasty memory leak in .normal()).
+* class matrix: solve() doesn't call algorithms redundantly any more and
+ inverse() falls back to solve() which works in more general cases.
+
+0.8.1 (16 April 2001)
+* degree(), ldegree(), coeff(), lcoeff(), tcoeff() and collect() can now
+ be used with constants, functions and indexed expressions as well, so you
+ can use it to collect by powers of Pi or sin(x), or to find the coefficient
+ of gamma~0.
+ Limitations:
+ - it only works with symbols, constants, functions and indexed expressions,
+ trying to find the coefficient of, e.g., "x^2" or "x+y" won't work;
+ - it does not know about dummy index summations; the coefficient of
+ gamma~0 in p.mu*gamma~mu should be p.0 but is returned as 0;
+ - using coeff(), tcoeff(), lcoeff() or collect() on elements of
+ noncommutative products might return wrong or surprising results.
+* subs() no longer only substitutes symbols and indices but performs a more
+ general "syntactic substitution", i.e. it substitutes whole objects in sub-
+ expressions. You can subs((a+b)^2,a+b==3) and get 9, but subs(a+b+c,a+b==3)
+ doesn't do anything.
+ Limitations:
+ - substituting numerics (subs(expr, 2==4)) will not replace then in all
+ occurences; in general, you shouldn't substitute numerics, though.
+* Added preliminary (re)implementations of color and clifford classes.
+* simplify_indexed(): contraction of symmetric and antisymmetric tensors
+ is zero.
+* Replaced the various print*() member functions by a single print() that
+ takes a print_context object that determines the output formatting. This
+ should make it easier to add more output types, such as LaTeX output,
+ which is based on work by Stefan Weinzierl.
+* Added functions to retrieve the properties stored in archive objects
+ outside of unarchive() (for printing or debugging purposes).
+* Some bugfixes (indexed objects, archive writing).
+* .collect() on non-polynomials is now algebraically correct.
+
+0.8.0 (24 March 2001)
+* 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.
-* normal() handles large sums of fractions better.
+* normal() handles large sums of fractions better and normalizes the exponent
+ of power expressions.
* expand() always expands the exponent and transforms x^(a+b) -> x^a*x^b.
+* Some bugfixes of series expansion around branch cuts of special functions.
0.7.0 (15 December 2000)
* Requires CLN 1.1 now. Class numeric doesn't use an indirect pointer to the
git://www.ginac.de / ginac.git / blobdiff