Use C++11 'nullptr' where applicable.

[ginac.git] / NEWS

diff --git a/NEWS b/NEWS
index bd495b3fff426ddeaf7557c6bb5c23c47238faab..c8220f42de4429b1405336a775292a4de6011236 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -1,5 +1,54 @@
 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).