added a check that expand(x^((a+b)^2-a^2-b^2-2*a*b)) -> 1

[ginac.git] / NEWS

diff --git a/NEWS b/NEWS
index 9c503db49875bde2b4fa9f0c6f45bbe7c7f1c77c..38804c6324a21d743c89cd91f9957ec75db5abca 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,53 @@
 This file records noteworthy changes.
 
-0.6.0 (...)
+0.7.1 (--date--)
+* 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.
+* expand() always expands the exponent and transforms x^(a+b) -> x^a*x^b.
+
+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 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()
+  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)
+  implementations of elimination schemes were thrown out.  The code is now
+  highly orthogonal, more flexible and much more efficient.
+* Some long standing and quite nasty bugs were discovered and fixed in the
+  following functions: add::normal(), heur_gcd(), sr_gcd() and Order_eval().
+
+0.6.3 (25 July 2000)
+* Derivatives are now assembled in a slightly different manner (i.e. they
+  might 'look' different on first sight).  Under certain circumstances this
+  can result in a dramatic speedup because it gives hashing a better chance,
+  especially when computing higher derivatives.
+* Some series expansions of built-in functions have been reengineered.
+* The algorithm for computing determinants can be chosen by the user.  See
+  ginac/flags.h and ginac/matrix.h.
+* The Dilogarithm (Li2) now has floating point evaluation, derivative and a
+  proper series expansion.
+* Namespace 'std' cleanly disentangled, as demanded by ISO/EIC 14882-1998(E).
+* Some minor bugfixes, one major lsolve()-bugfix and documentation updates.
+
+0.6.2 (21 June 2000)
+* ginaccint.bin is now launched by a binary program instead of by a scripts.
+  This allows us to write #!-scripts.  A small test suite for GiNaC-cint was
+  added.
+* Several minor bugfixes.
+
+0.6.1 (18 May 2000)
+* Cleanup in the interface to Cint.  The required version is now Cint 5.14.38.
+* Several bugfixes in target install.
+
+0.6.0 (11 May 2000)
 * IMPORTANT: Several interface changes make programs written with GiNaC 
   much clearer but break compatibility with older versions:
   - f(x).series(x,p[,o]) -> f(x).series(x==p,o)
@@ -11,8 +58,15 @@ This file records noteworthy changes.
 * #include'ing ginac.h defines the preprocessor symbols GINACLIB_MAJOR_VERSION,
   GINACLIB_MINOR_VERSION, and GINACLIB_MICRO_VERSION with the respective GiNaC
   library version numbers.
+* Expressions can be constructed from strings like this:
+    ex e("2*x+y", lst(x, y));
+* ex::to_rational() provides a way to extend the domain of functions like
+  gcd() and divide() that only work on polynomials or rational functions (the
+  good old ex::subs() method reverses this process)
+* Calling diff() on a function that has no derivative defined returns the
+  inert derivative function "Derivative".
 * Several new timings in the check target.  Some of them may be rather rude 
-  at your machine.
+  at your machine, feel free to interrupt them.
 
 0.5.4 (15 March 2000)
 * Some algorithms in class matrix (notably determinant) were replaced by