1 This file records noteworthy changes.
4 * lst (and exprseq) provide iterators for read-only element access. For
5 sequential access this is one order faster than using op().
6 * Implemented relational::subs() (this was done in 1.0.9 but inadvertently
7 omitted from the 1.1 branch).
8 * pole_error and do_taylor are available to library users.
9 * Added on-line help and Tab-completion for print(), iprint(), print_latex()
10 and print_csrc() in ginsh.
13 * Removed deprecated macros is_ex_a, is_ex_exactly_a and friends for good.
14 * The scalar_products mechanism allows the specification of an index dimension.
15 * Removed dirac_gamma6/7().
16 * Added ex::to_polynomial().
17 * subs() accepts an optional "options" argument. The option
18 subs_option::subs_algebraic enables "smart" substitutions in products and
20 * Added stream manipulators "dflt", "latex", "python", "python_repr", "tree",
21 "csrc", "csrc_float", "csrc_double", "csrc_cl_N", "index_dimensions" and
22 "no_index_dimensions" to control the output format. Calling basic::print()
23 directly is now deprecated.
24 * Made the hashing more simple and efficient.
25 * Caveats for class implementors:
26 - basic::subs(): third argument changed from "bool" to "unsigned"
27 - unarchiving constructor and basic::unarchive(): "const" removed from
29 - basic::let_op() should only be implemented if write access to
30 subexpressions is desired
31 - simplify_ncmul() renamed to eval_ncmul()
32 - simplified_ncmul() renamed to hold_ncmul()
33 - nonsimplified_ncmul() renamed to reeval_ncmul()
36 * Improved the C-source output: complex numbers are printed correctly (using
37 the STL complex<> template or cln::complex()), rational numbers use cl_RA()
38 in the CLN output, and small integers are printed in a more compact format
39 (e.g. "2.0" instead of "2.0000000e+00").
40 * function_options::set_return_type() and function_options::do_not_evalf_params()
43 1.0.13 (27 January 2003)
44 * Contracting epsilon tensors with Euclidean indices now works.
45 * Improved dummy index symmetrization in sums.
46 * Added dirac_gammaL/R(), which can be used instead of dirac_gamma6/7()
47 but are single objects, to allow for a more compact notation of Dirac
49 * Powers with negative numeric exponents are printed as fractions in the
51 * Added symbolic_matrix() for the convenient creation of matrices filled
53 * Added collect_common_factors() which collects common factors from the
55 * simplify_indexed() converts "gamma~mu*p.mu" to "p\".
57 1.0.12 (30 October 2002)
58 * Fixed a bug in power::expand() that could produce invalid expressions.
59 * The input parser no longer ignores extra data following accepted input.
60 * Improved the CLN C-source output (integers are printed as integers, and
61 floating point numbers include the precision).
62 * Fixed a problem in the LaTeX-output of negative fractions.
63 * Added print_latex() and print_csrc() to ginsh.
64 * The sprem() function is now public.
66 1.0.11 (18 September 2002)
67 * Fixed a possible memory corruption in contractions of indexed objects with
68 delta or metric tensors.
69 * Computing the derivative of a power series object with respect to a symbol
70 that is not the expansion variable now works correctly.
71 * Several bugfixes in code generation.
74 * Powers of indexed objects are now parenthesized correctly in LaTeX output.
75 * Input parser handles indices (they have to be specified in the same list
77 * Added some limited support for subspaces in the idx and tensor classes.
78 * Fixed a bug in canonicalize() (antisymmetric canonicalization of an already
79 sorted list containing two or more equal objects failed to return 0).
82 * simplify_indexed() now raises/lowers dummy indices to canonicalize the index
83 variance. This allows some simplifications that weren't possible before,
84 like eps~a.b~c~d*X.a*X~b -> 0 and X.a~a-X~a.a -> 0.
85 * Implemented relational::subs().
86 * Fixed bug in simplify_ncmul() for clifford objects.
89 * Improvements in memory usage of the expand() methods.
92 * Fixed LaTeX output of indexed and matrix objects.
93 * Fixed matrix::pow(n) for n==0 and added helper functions to create unit
94 matrices "ex unit_matrix(unsigned, unsigned)".
97 * "(x+1).subs(x==x-1)" now returns the correct result "x" instead of "x-1".
99 1.0.5 (27 January 2002)
100 * (l)degree(s), coeff(s, n) and collect(s) were extended to accept expressions
101 of any class (except add/mul/ncmul/numeric) for "s". They should even work
102 if "s" is a "power" object, as long as the exponent is non-integer, but with
103 some limitations. For example, you can "collect(a*2^x+b*2^x, 2^x)" to get
104 "(a+b)*2^x", but "degree(2^(3*x), 2^x)" yields 0 instead of 3).
105 * Fixed a small output bug.
107 1.0.4 (24 January 2002)
108 * Speedup in expand().
109 * Faster Bernoulli numbers (Markus Nullmeier).
110 * Some minor bugfixes and documentation updates.
112 1.0.3 (21 December 2001)
113 * Fixed a bug where quo() would call vector::reserve() with a negative
115 * Fix several bugs in code generation.
117 1.0.2 (19 December 2001)
118 * Input parser recognizes "sqrt()", which is also used in the output.
119 * divide(a,b,q) only modifies q if the division succeeds; also, divide(a,b,a)
121 * Fixed small bug in dummy index renaming which could cause it to not
122 recognize renamable indices in some cases.
123 * power::degree() and power::ldegree() throw an exception when encountering
124 a non-integer exponent.
125 * Add output-support for Python bindings.
127 1.0.1 (22 November 2001)
128 * Function sqrfree() handles a few more cases now.
129 * Class relational has real canonical ordering now.
130 * Handle obscene libreadline version numbers when building ginsh.
132 1.0.0 (6 November 2001)
133 * Some internal reorganization resulting in a general speed-up.
134 * The last 3 evaluated expressions in ginsh are now referred to with the
135 tokens '%', '%%' and '%%%'. The old '"', '""' and '"""' remain for
136 compatibility but may be removed in a future version of GiNaC.
138 0.9.4 (20 September 2001)
139 * Functions have better support for external scripting languages.
140 * Interface cleanups and bugfixes.
141 * Fix silly bug in evalf() that prevented things like 2^Pi being computed.
143 0.9.3 (16 August 2001)
144 * series expansion now much more consistent for small order expansion.
145 * lsolve() accepts algorithmic hint as parameter.
148 * Epsilon tensor is more functional.
149 * simplify_indexed() is better at detecting expressions that vanish for
151 * Several little bugfixes and consistency enhancements.
154 * Ctors of class numeric are not explicit any more. All built-in callers for
155 pseudofunctions are now templated and default to ex arguments which relaxes
156 the need for explicit ctors.
157 * New functions/methods:
159 - remove_first(), remove_last(), sort() and unique() for lists
160 - symmetrize_cyclic()
162 * Instead of just totally symmetric or antisymmetric, complex symmetries
163 can now be defined for indexed objects. Symmetries are described by a
164 tree of "symmetry" objects that is constructed with the sy_none(),
165 sy_symm(), sy_anti() and sy_cycl() functions. The symmetry of a function
166 with respect to its arguments can also be defined (this is currently
167 only used for the Beta function).
168 * Generalized map() to take a function object instead of a function pointer.
169 This allows passing an arbitrary number of additional state to the
170 function being called.
171 * color_trace(), dirac_trace(), diff(), expand(), evalf() and normal() work
172 better with container classes, e.g. using color_trace() on a relation will
173 take the trace on both sides, using diff() on a matrix differentiates every
175 * diff() works properly with non-commutative products and indexed objects.
176 * New option flag "expand_function_args" for expand().
177 * Supplement some (now deprecated) macros by inlined template functions:
178 - is_of_type(foo, type) -> is_a<type>(foo)
179 - is_ex_of_type(foo, type) -> is_a<type>(foo)
180 - is_exaclty_of_type(foo, type) -> is_exaclty_a<type>(foo)
181 - is_ex_exaclty_of_type(foo, type) -> is_exaclty_a<type>(foo)
182 - ex_to_foobar(baz) -> ex_to<foobar>(baz)
183 * rem(c, p[x], x) (c: numeric, p[x]: polynomial) erroneously returned p[x]
185 * Small bugfixes in pattern matching.
186 * Updated libtool to version 1.4.
189 * In the output and in ginsh, lists are now delimited by { } braces, and
190 matrices are delimited by single [ ] brackets.
191 * simplify_indexed() renames dummy indices so, e.g., "a.i*a.i+a.j*a.j" gets
192 simplified to "2*a.i*a.i" (or "2*a.j*a.j").
193 * New functions/methods:
194 - canonicalize_clifford() (helpful when comparing expressions containing
196 - symmetrize() and antisymmetrize()
197 - numer_denom() (return numerator and denominator in one call)
198 - map() (apply function to subexpressions)
199 - evalm() (evaluate sums, products and integer powers of matrices)
200 * Added a new function match() for performing pattern matching. subs() and
201 has() also accept patterns as arguments. A pattern can be any expression,
202 optionally containing wildcard objects. These are constructed with the
203 call "wild(<unsigned>)" and are denoted as "$0", "$1" etc. in the output
205 * Positive integer powers of non-commutative expressions (except matrices)
206 are automatically expanded.
207 * Removed cint subdirectory, ginaccint is a separate package now due to
208 packaging considerations.
209 * Several little bugfixes.
212 * color and clifford classes are functional and documented.
213 * New "spinidx" class for dotted/undotted indices.
214 * Predefined spinor metric tensor (created by spinor_metric()).
215 * Symbols can have a LaTeX name, e.g. symbol s("s", "\\sigma");
216 * LaTeX output of indexed objects is much nicer.
217 * Fixed some build problems (with recent libreadline).
218 * Semantics of arithmetic operators now follows the C++ rules more strictly.
220 0.8.2 (24 April 2001)
221 * degree(), ldegree(), coeff(), lcoeff(), tcoeff() and collect() work with
222 non-symbols as the second argument in ginsh.
223 * the argument to collect() can be a list of objects in which case the
224 result is either a recursively collected polynomial, or a polynomial in
225 a distributed form with terms like coeff*x1^e1*...*xn^en, as specified by
226 the second argument to collect().
227 * Several bugfixes (including a nasty memory leak in .normal()).
228 * class matrix: solve() doesn't call algorithms redundantly any more and
229 inverse() falls back to solve() which works in more general cases.
231 0.8.1 (16 April 2001)
232 * degree(), ldegree(), coeff(), lcoeff(), tcoeff() and collect() can now
233 be used with constants, functions and indexed expressions as well, so you
234 can use it to collect by powers of Pi or sin(x), or to find the coefficient
237 - it only works with symbols, constants, functions and indexed expressions,
238 trying to find the coefficient of, e.g., "x^2" or "x+y" won't work;
239 - it does not know about dummy index summations; the coefficient of
240 gamma~0 in p.mu*gamma~mu should be p.0 but is returned as 0;
241 - using coeff(), tcoeff(), lcoeff() or collect() on elements of
242 noncommutative products might return wrong or surprising results.
243 * subs() no longer only substitutes symbols and indices but performs a more
244 general "syntactic substitution", i.e. it substitutes whole objects in sub-
245 expressions. You can subs((a+b)^2,a+b==3) and get 9, but subs(a+b+c,a+b==3)
248 - substituting numerics (subs(expr, 2==4)) will not replace then in all
249 occurences; in general, you shouldn't substitute numerics, though.
250 * Added preliminary (re)implementations of color and clifford classes.
251 * simplify_indexed(): contraction of symmetric and antisymmetric tensors
253 * Replaced the various print*() member functions by a single print() that
254 takes a print_context object that determines the output formatting. This
255 should make it easier to add more output types, such as LaTeX output,
256 which is based on work by Stefan Weinzierl.
257 * Added functions to retrieve the properties stored in archive objects
258 outside of unarchive() (for printing or debugging purposes).
259 * Some bugfixes (indexed objects, archive writing).
260 * .collect() on non-polynomials is now algebraically correct.
262 0.8.0 (24 March 2001)
263 * Complete revamp of indexed objects. Instead of multiple classes for
264 indexed things and their indices there is now only one "indexed" class
265 and two types of indices: "idx" for simple indices and "varidx" for
266 indices with variance. There are predefined delta, epsilon and metric
267 tensors, and a function simplify_indexed() that performs canonicalization
268 and dummy index summations. Matrix objects can be indexed for doing simple
270 * Added an option "expand_indexed" to expand() to perform expansion of
271 indexed objects like (a+b).i -> a.i + b.i
272 * Renamed get_indices() to get_free_indices(), which no longer returns
273 dummy indices and checks the consistency of indices in sums.
274 * sqrfree() factorization fixed and improved syntactically.
275 * subs() works on matrices.
276 * Matrices can be constructed from flat list of elements; diagonal matrices
277 can be constructed from list of diagonal elements with diag_matrix().
278 * Fixed memory leak in expand().
279 * Operator% for objects of class ncmul has gone. Use operator* now for that
280 case too, which is much more natural.
282 0.7.3 (28 February 2001)
283 * Several bugfixes and minor performance tunings.
284 * Added a section to the tutorial about adding new algebraic classes to GiNaC.
285 * Closed many in-source documentation gaps.
287 0.7.2 (17 February 2001)
288 * Several bugfixes in power series expansion, one of them critical.
290 0.7.1 (7 February 2001)
291 * Fix problems with Cint that were caused by CLN's overloaded operator new.
292 * Fix compilation errors with GCC3.
293 * normal() handles large sums of fractions better and normalizes the exponent
294 of power expressions.
295 * expand() always expands the exponent and transforms x^(a+b) -> x^a*x^b.
296 * Some bugfixes of series expansion around branch cuts of special functions.
298 0.7.0 (15 December 2000)
299 * Requires CLN 1.1 now. Class numeric doesn't use an indirect pointer to the
300 actual representation any more. This is a speedup.
301 * mul::expand() was reengineered to not allocate excess temporary memory.
302 * Non-integer powers of a symbol are treated as constants by (l)degree() and
303 coeff(). Using these functions on an expression containing such powers used
304 to fail with an internal error message. The side-effect is that collect()
305 can be used on expressions which are not polynomials.
306 * Added a man page for the ginac-config script.
307 * Ctor of numeric from char* honors Digits.
309 0.6.4 (10 August 2000)
310 * Complete revamp of methods in class matrix. Some redundant (and poor)
311 implementations of elimination schemes were thrown out. The code is now
312 highly orthogonal, more flexible and much more efficient.
313 * Some long standing and quite nasty bugs were discovered and fixed in the
314 following functions: add::normal(), heur_gcd(), sr_gcd() and Order_eval().
317 * Derivatives are now assembled in a slightly different manner (i.e. they
318 might 'look' different on first sight). Under certain circumstances this
319 can result in a dramatic speedup because it gives hashing a better chance,
320 especially when computing higher derivatives.
321 * Some series expansions of built-in functions have been reengineered.
322 * The algorithm for computing determinants can be chosen by the user. See
323 ginac/flags.h and ginac/matrix.h.
324 * The Dilogarithm (Li2) now has floating point evaluation, derivative and a
325 proper series expansion.
326 * Namespace 'std' cleanly disentangled, as demanded by ISO/EIC 14882-1998(E).
327 * Some minor bugfixes, one major lsolve()-bugfix and documentation updates.
330 * ginaccint.bin is now launched by a binary program instead of by a scripts.
331 This allows us to write #!-scripts. A small test suite for GiNaC-cint was
333 * Several minor bugfixes.
336 * Cleanup in the interface to Cint. The required version is now Cint 5.14.38.
337 * Several bugfixes in target install.
340 * IMPORTANT: Several interface changes make programs written with GiNaC
341 much clearer but break compatibility with older versions:
342 - f(x).series(x,p[,o]) -> f(x).series(x==p,o)
343 - series(f(x),x,p[,o]) -> series(f(x),x==p,o)
344 - gamma() -> tgamma() (The true Gamma function, there is now also
345 log(tgamma()), called lgamma(), in accord with ISO/IEC 9899:1999.)
346 - EulerGamma -> Euler
347 * #include'ing ginac.h defines the preprocessor symbols GINACLIB_MAJOR_VERSION,
348 GINACLIB_MINOR_VERSION, and GINACLIB_MICRO_VERSION with the respective GiNaC
349 library version numbers.
350 * Expressions can be constructed from strings like this:
351 ex e("2*x+y", lst(x, y));
352 * ex::to_rational() provides a way to extend the domain of functions like
353 gcd() and divide() that only work on polynomials or rational functions (the
354 good old ex::subs() method reverses this process)
355 * Calling diff() on a function that has no derivative defined returns the
356 inert derivative function "Derivative".
357 * Several new timings in the check target. Some of them may be rather rude
358 at your machine, feel free to interrupt them.
360 0.5.4 (15 March 2000)
361 * Some algorithms in class matrix (notably determinant) were replaced by
362 less brain-dead ones and should now have much better performance.
363 * Checks were completely reorganized and split up into three parts:
364 a) exams (small regression tests with predefined input)
365 b) checks (lenghty coherence checks with random input)
366 c) timings (for coherence and crude benchmarking)
367 * Behaviour of .evalf() was changed: it doesn't .evalf() any exponents.
368 * Expanded expressions now remember they are expanded to prevent
369 superfluous expansions.
370 * Small bugfixes and improvements in the series expansion.
372 0.5.3 (23 February 2000)
373 * A more flexible scheme for registering functions was implemented,
374 allowing for remembering, too.
377 0.5.2 (16 February 2000)
378 * Mainly fixes a bug in the packaging of release 0.5.1.
380 0.5.1 (14 February 2000)
381 * Fixes a small number of bugs.
383 0.5.0 (7 February 2000)
384 * Expressions can be written ("archived") to files and read therefrom.
385 * Addition of GiNaC-cint, which lets you write complete programs in
386 an interactive shell-like manner in your favoured programming
389 0.4.1 (13 December 1999)
390 * Series Expansion of Gamma function and some other trigonometric
391 functions at their poles works now.
392 * Many more evaluations of special functions at points where
394 * info_flags::rational doesn't return true for complex extensions
395 any more---use info_flags::crational for the old behaviour.
396 info_flags::integer and -::cinteger work similarly, the same
397 holds for types like info_flags::rational_polynomial.
399 0.4.0 (26 November 1999)
400 * First public release.