X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=NEWS;h=c8220f42de4429b1405336a775292a4de6011236;hp=1c863785abcd5c0cb2daca32c4b972d0e7960414;hb=cc308418b3e239e05a7f1f0f6cfc5919672fccfd;hpb=1d0ab629c691c48e6aa6c291a052f27b726b26ff diff --git a/NEWS b/NEWS index 1c863785..c8220f42 100644 --- a/NEWS +++ b/NEWS @@ -1,5 +1,128 @@ This file records noteworthy changes. +1.6.5 (27 July 2015) +* Fix pow(+(...),2).expand() where the sum contained roots of expressions. +* Speed-up pow(+(...),n).expand() where n > 3. +* Fix a crash in PolyLogs of rational numbers. + +1.6.4 (8 May 2015) +* Fix pow(+(...),2).expand() where the sum contained roots of rationals. +* Various improvements for info(info_flags::nonnegative). +* Make power::expand() (x*p)^c -> x^c * p^c, if p>0. +* Fix normal() where nested functions occur multiple times. +* Add optional explicit derivatives to functions and use it in abs(), + imag_part(), real_part(). +* Evaluate abs(z)^(2n) -> z^n * conjugate(z)^n. + +1.6.3 (27 November 2014) +* New expand_options::expand_transcendental. GiNaC will apply additional + rules when expanding expressions if this option is specified, i.e. + log(a*b) -> log(a) + log(b) + exp(a + b) -> exp(a)*exp(b) +* Functions can define a custom expand() and info() now. +* Automatically rewrite (x^{-1})^c -> x^{-c} for positive c. +* Transform abs(x)^n -> x^n if x is real and n is even. +* Improved power::info(): power with a real base and even exponent + reports that it's non-negative. +* Fixed spurious match failure due to expairseq::match() bug: + > match(sin(y)*exp(b)+sin(x)*exp(a), sin($0)*exp(a)+exp(b)*sin($1)) + FAIL +* Fixed power::is_polynomial() and mul::is_polynomial() computation. +* factor_univariate correctly handles polynomials over rationals (no + segfaults any more). +* Fixed an infinite loop in factor_multivariate due to incorrect handling + of polynomials having a leading coefficient being a sum with a non-trivial + integer content. +* Fixed numeric evaluation of generalized multiple polylogarithms for real + and negative argument. +* Avoid calling log(1-x) in numeric evaluation of classical polylogarithm. +* Fixed numeric evaluation of multiple polylogarithms (correctly set + the signs of the imaginary parts in the intermediate expression). +* Fixed numeric evaluation of Nielsen polylogs for arguments close to + the 6th root of unity or its conjugate. +* Avoid infinite recursion in series expansion of logarithm. +* numeric::info(info_flags::nonnegative) correctly handles complex numbers + with non-zero imaginary part. +* Fixed several build issues: + - libreadline and dlopen() misdetection. + - multiple definition of symbol on MinGW. + - auto* tools and texinfo being unhappy in various ways. +* GiNaC can be built with CMake now. + +1.6.2 (6 November 2011) +* Fixed the parser to read GiNaC::lst again. +* Fixed a compile warning (relevant to openSUSE build). +* Fixed a bug concerning the subsitutions in indexed expressions + (subs_options::no_index_renaming was ignored). + +1.6.1 (18 July 2011) +* Fixed several internal assertions for the debug version of GiNaC. +* More verbose report of (auto-)configuration problems. +* Fixed a compile problem with ginsh using gcc 4.6. + +1.6.0 (22 May 2011) +* Fixed compilation issues with clang. +* Fixed compilation issues with VC++. +* Fixed a segfault in fsolve() and improved its numerical algorithm. +* Fixed several memory leaks in power::eval(). +* Fixed the substitution algorithm that led to wrong results (exp(log(x))->x). +* Fixed a bug in add:eval() (real_part() had returned wrong results). +* Fixed infinite loop bug when unarchiving realsymbol and possymbol. +* Fixed bugs in the GCD code. +* Fixed empty string bug in symbol::get_name(). +* Fixed bugs concerning STL vector sizes that can potentially cause segfaults. +* Fixed a bug in is_polynomial(). +* Removed autogen dependencies. +* Improved simplify_indexed() algorithm. +* Changed the connection between library version and package version. +* power::series() can handle now more expressions with singularities in the exponent. +* Added conjugate() methods to functions cosh, sinh, tanh. + +1.5.8 (06 July 2010) +* Changed default behaviour of conjugate() for user-defined functions to avoid + wrong evaluations. A user-defined conjugate_func must now be explicitly + registered. +* Fixed: Parser now handles abbreviations as advertized in the manual. +* Fixed two bugs in the GCD code (one infinite loop, one miscalculation). +* Fixed dangerous iterator use. +* Fixed a memory leak in excompiler. +* Fixed several syntax issues wrt to gcc 4.5 and wrt to compile option -std=cxx0x. +* Fixed a wrong URL and a texinfo problem in the manual. +* Added degree_vector() utility function. + +1.5.7 (29 March 2010) +* Fixed a bug in the GCD code (infinite loop in pgcd()). +* Fixed a bug in atan2() (division by zero error for atan2(x,0) if x is a + negative and composite term). +* Products now correctly set info_flags::negative and info_flags::negint. + +1.5.6 (28 January 2010) +* Fixed compile problem with gcc 3.4. +* Improved excompiler: The ginac-excompiler script will only be installed if + excompiler is supported and enabled. + +1.5.5 (04 November 2009) +* Correct libtool versioning. + +1.5.4 (02 November 2009) +* Default parser now can again read in user defined classes. +* Add mul::info() and add::info() support for numeric info_flags (GiNaC now can + detect that the sum or product of a number of positive expressions is again a + positive expression). +* Fixed cast that caused compile error on 64bit machines. +* Fixed incorrect uses of STL iterators. +* Removed subdirectory debian. +* Output LaTeX-symbols using \mathrm, instead of \mbox. + +1.5.3 (30 July 2009) +* The parser now understands user-defined functions by default. The identifier + names can now contain underscores. + +1.5.2 (10 July 2009) +* Fixed documentation of return_type_info() +* Fixed cstdio include issue. +* GiNaC now requires at least version 1.2.2 of cln. + 1.5.1 (25 February 2009) * Fixed compiling problems with GNU g++ 3.4. * Work around weird C++ RTTI behaviour on woe32 so GiNaC works on MinGW again.