X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=NEWS;h=8c11cffc96ef9a4b3ffb9fbf601c3599f491374a;hp=c6fa4826cce4554f557883eda7a1dd79a7844f8a;hb=029a7f37abdeffb71ce07f33603e004558ed0f3c;hpb=9e2c1a0044ff991627ae22070727a33e12d79954 diff --git a/NEWS b/NEWS index c6fa4826..8c11cffc 100644 --- a/NEWS +++ b/NEWS @@ -1,14 +1,46 @@ This file records noteworthy changes. -0.7.0 () +0.8.0 () +* 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. +* 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. +* Fixed memory leak in expand(). + +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 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 actual representation any more. This is a speedup. -* mul::expand() was reengineered to not allocate temporary excess memory. +* mul::expand() was reengineered to not allocate excess temporary memory. * Non-integer powers of a symbol are treated as constants by (l)degree() and - coeff(). Using these functions on an expression containing such powers used - to fail with an internal error message. The side-effect is that collect() + coeff(). Using these functions on an expression containing such powers used + to fail with an internal error message. The side-effect is that collect() can be used on expressions which are not polynomials. * Added a man page for the ginac-config script. +* Ctor of numeric from char* honors Digits. 0.6.4 (10 August 2000) * Complete revamp of methods in class matrix. Some redundant (and poor)