Changelog

pynac-0.7.22 (2018-Jun-24)

• fix matching
• fix rational decomposition
• fix power inconsistency
• internal fix of another power inconsistency (Sage 25639)
• (x^a)^b --> x^(ab) IF x real, a odd integer, ab integer
• add ex::treesize() as complexity metric

pynac-0.7.21 (2018-Jun-06)

• add missing file
• matching fixes
• provide working versions of quo_rem and rational decomposition
• information for packagers

pynac-0.7.20 (2018-May-29)

• implement commutative matching; fix GiNaC's matching deficiencies (Sage #25168)
• substitute patternless if no wildcards present
• remove some compiler warnings
• update AX_CXX_COMPILE_STDCXX.m4

pynac-0.7.19 (2018-Apr-08)

• fix exp(c*f(x)) simplification
• fix cases(...).subs(...)
• function::info for min/max_symbolic; see Sage #21945
• performance and readability improvements

pynac-0.7.18 (2018-Mar-27)

• correct sinh/cosh/tanh return type (Sage #24299)
• atan2 fixes
• potential memleaks fixed
• fixes in Giac interface
• subs can now substitute numeric terms (Sage #23964)

pynac-0.7.17 (2018-Feb-26)

• fix memleak in in-place PyObject numerics; see Sage 24745
• Python interface / Py3 fixes and improvements (thx Erik Bray, Sage #24561, #24752)
• fix internal asin/acos of complex balls
• draw factors out of add^rational; see Sage 24768
• exp(f(x)), exp(c*f(x)), f inv. hyperbolic simplifications
• always extend trig/hyperbolic functions to complex domain (Sage #24428)
• extensive code readability improvements

pynac-0.7.16 (2018-Feb-06)

• Python interface / Py3 fixes and improvements (thx Erik Bray, Sage #24561)
• atan2 fixes (Sage #24604)
• beta fixes
• fix atanh/acoth(real) and polylog (Sage #24299)
• immediate atanh/acoth --> log simplifications (Sage #24658)
• legendre_P (Sage #24553)
• chebyshev_T/U (Sage #16812)
• speedup in special polynomial creation
• remove clang-check error
• remove many clang-tidy warnings
• remove unused code
• added CONTRIBUTING.md

pynac-0.7.15 (2018-Jan-09)

• fix mpz conversion (Sage #24418)
• fix infinity.info(), function.info(), power.info(negative)
• fix symbol.real/imag_part()
• fix bug showing with nonnumeric rationals
• fix Pyth on import from sage.rings
• rational symbol domain (Sage #24368)
• implement constant.is_nonzero() (Sage #18630)
• fully implement info(even) (Sage #24351)
• fully implement info(nonzero)
• fully implement info(rational)

pynac-0.7.14 (2017-Dec-06)

• fix subs regression (Sage #24262)
• improve inexact numerics (Sage #24299, #24317)
• (x^-a)^-b --> (x^a)^b, with a,b numeric > 0
• fix mul of infinities (Sage #24327)
• implement has_function() (Sage #24283)
• use arb for inverse trig/hyperbolic funs
• internally rename tgamma to gamma (affects print order)

pynac-0.7.13 (2017-Nov-21)

• fix ex.coefficients() bugs (Sage #23545, #24147)
• fix interface to Singular GCD (Sage #23845)
• fix compiler warnings
• asin/atan enhancements (Sage #24211)
• set_of_all() function (Sage #24176)
• upgrade ax_cxx_compile_stdcxx_11.m4

pynac-0.7.12 (2017-Oct-01)

• symbol replacements should inherit flags; care for exp() (Sage #23861)
• check series and polynomials for exponent overflow (Sage #12589)
• fixes and improvements to Singular conversion
• make factor() as capable as Maxima's (Sage #23835)
• immediate exp(x)^y simplifications
• immediate log of small powers simplifications (Sage #23224)
• make degree functions return numeric

pynac-0.7.11 (2017-Sep-10)

• fix coeff() problem with fraction as argument (Sage #19996)
• fix: useries wasn't adapted to long numeric changes
• include last-minute fix from Sage #23325
• hold context; see Sage #10035
• immediate simplification of trig function with argument of form I*x
• immediate simplification of hyperbolic function with argument of form I*x
• (x*y^(m/n)*z)^(r/s) ---> y^t*(x*z)^(r/s), if t integer
• cases function; see Sage #20191
• use Singular for expansion of mul above certain threshold
• improvements with using libtool in configure
• remove unused code

pynac-0.7.10 (2017-Aug-09)

• fix segmentation fault with coefficients(); see Sage #23545
• fix compile error --with-giac=yes
• fix tgamma/lgamma return types
• internal LONG numeric; general speedup

pynac-0.7.9 (2017-Jun-24)

• remove static PyObjects; (Sage #23134)
• (real^m)^(1/n) --> abs(real)^(m/n), m even, m/n integer; see Sage #14305
• fix add::conjugate(); see Sage #23135
• fix is_real(zeta(real))
• negative symbolic domain from assume(sym<0); see Sage #21973
• add missing calls to set_domain in symbol constructors; see Sage #23138
• implement add.info(negative)
• exact comparison of overall_coefficients
• fast internal in-place arithmetic operators
• obsolete some internal usages of Python

pynac-0.7.8 (2017-Jun-03)

• fix series bug (Sage #22733)
• fix polylog return type for some arguments (Sage #18386)
• fix Python3 compile (thanks François)
• fix symbol.set_domain(); fix power.is_real() (Sage #23093)
• add limit function to functions with bound symbols (part of Sage #20179)
• numeric power speedup and cleanup
• optimizations in usage of Sage Python functions
• optimizations in Python C API usage
• source cleanup using clang checks; removes some compile warnings

pynac-0.7.7 (2017-May-10)

• fix regression in Singular interface (known bug in Sage #22838)
• fix series problems (Sage #22959)
• fix dilog/polylog numerics (Sage #18386, #19906)
• avoid Python errors when comparing complex in richcmp
• general handling of evalf of one-arg functions (obsoletes py_sin etc)

pynac-0.7.6 (2017-Apr-20)

• fix test failure with debug version of Singular
• heaviside and unit_step equivalent to Sage's versions (Sage #10070)
• always return unsigned infinity with zeta(1.0) (Sage #19439)
• return symbolic NaN in asin/acos (Sage #22823)
• unconditionally use Singular for resultants (Sage #22364)
• add ex::free_symbols() and interface it (Sage #20179)
• Appell F1 improvements

pynac-0.7.5 (2017-Feb-12)

• Gosper algorithm improvements
• pynac.pc was missing giac

pynac-0.7.4 (2017-Jan-20)

• improve domain logic (Sage #18883, #22026)
• improve derivatives of conjugate, real, imag, abs (Sage #22209)
• precision was lost with some useries
• replace crationality with exactness when deciding when to evalf (fixes Sage #22142)
• fix giac support (Sage #21885)
• expose to_gamma() and gamma_normalize() to Sage (Sage #22174)
• improve gamma normalization in Gosper summation
• performance improvements

pynac-0.7.3 (2017-Jan-04)

• Gosper algorithm (see Sage #22090 for details)
• fixes to Singular interface
• internal expression factorization
• internal integer factorization (into longs) via Flint and divisors
• internal integer factorial and binomial via GMP
• make all info requests on NaN return false,

pynac-0.7.2 (2016-Dec-06)

• fix dilog problems (Sage #19906)
• fix Singular GCD interface
• fix is_real(positive^positive) (Sage #21940)
• better error message with evalf of some orthogonal polys
• improve pkg-config usage

pynac-0.7.1 (2016-Nov-24)

• add libfactory interface; unconditionally replace GiNaC GCD with Singular (Giac still optional); this fixes Sage #10284; it means that Singular is now another Pynac dependency
• fix zeta expansion around 1 (behackl)
• fix Giac GCD doctest fail
• fix NaN unpickling (uncovered in Sage #20939)
• fix Flint underlinking (fbissey)
• add internal rising/falling factorial

pynac-0.7.0 (2016-Nov-05)

• Pynac now depends on Flint
• fast univariate series expansion using Flint (Sage #14878)
• fix gamma(QQbar(1/2)) problem
• gegenbauer(n,a,x) fixes and enhancements (Sage #21639)
• fix hermite derivative wrt index (Sage #21618)

pynac-0.6.91 (2016-Oct-02)

• compiles with clang
• fix cot(float) bug; (Sage #21365)
• NaN constant; return NaN with atan2(0,0) (Sage #21614)
• numeric log fixes
• prevent some overflow exceptions in cot/csc
• two-argument log (log to base)
• Support gegenbauer(n,a,x) with non-numeric a
• update AUTHORS

pynac-0.6.9 (2016-Aug-30)

• fix bug affecting Cygwin compile (Sage #21265)
• combine some numerics in nested powers; (Sage #21360)
• fix and clean up ex::coefficients() (Sage #20455)
• expand() denominators too (Sage #21302)
• make ex::combine_fractions() recursive (Sage #20858)
• more normal() options (Sage #21335)
• Appell F1 function skeleton
• updates from GiNaC

pynac-0.6.8 (2016-Jul-17)

• fix polylog evalf (Sage #18368)
• better beta_evalf() (Sage #15196)
• fix bug in cancelling of fractions (Sage #19775, #20843)
• fix some positive/nonnegative bugs
• do not ignore _print_latex_() in GinacFunctions
• provide Pynac version of Maxima's ex.coefficients() (Sage #20455)
• some fixes ported from GiNaC

pynac-0.6.7 (2016-Jun-08)

• fix trig function arg reflection (Sage #20752)
• fix compile without giac
• fix giac detection

pynac-0.6.6 (2016-Jun-01)

• fix Hermite/Gegenbauer evalf
• fix Py3 compile
• fix clang compile errors
• install pynac-config.h instead of config.h to prevent duplicate defines
• fix internal binomial of noninteger
• optionally use giac for GCD

pynac-0.6.5 (Apr 20, 2016)

• fix for: assume(x>0) sets integer flag
• fix Maxima crashes by implementing fast Hermite and Gegenbauer polynomials in Pynac
• some fixes to handling of elements of rings with positive characteristics
• Python 3 build fix
• automatic trigonometric and log simplifications
• direct call of Sage's hypergeometric::_evalf_ to compute pFq

pynac-0.6.4 (Mar 5, 2016)

• fix positive+integer assumption conflicts
• from GiNaC: [bugfix] fix elusive bug in quo, rem,...
• from GiNaC: [bugfix] fix sqrfree(poly) for zero polynomials in disguise.
• more trigonometric simplifications
• always expand function arguments
• performance: GiNaC functions for coth/sech/csch/acoth/asech/acsch
• AUTHORS updated

pynac-0.6.3 (Feb 29, 2016)

• fix Re/Im(tanh); see Sage ticket 20098
• sin/cos/tan of numeric: reduce mod 2*pi
• exp of numeric: reduce mod 2*pi*I
• performance: speed up sin/cos/tan/cot/coth evaluation

pynac-0.6.2 (Feb 22, 2016)

• fix bugs in zeta series and powers of series
• performance: GiNaC functions for sec/csc/asec/acsc

pynac-0.6.1 (Jan 23, 2016)

• Stieltjes constant function
• zeta expansion at 1 using stieltjes() (thanks Benjamin Hackl)
• fix hashing of infinities
• fix exp and atan of oo
• fix pseries print order
• speedups and fixes from GiNaC

pynac-0.6.0 (Jan 2, 2016)

• backward-incompatible interface change

pynac-0.5.4 (Jan 1, 2016)

• fix expansion of abs(power)
• fix a wrong function option with zeta/zeta2
• fix wrong formula for tan(...).imag()
• fix mpq_pythonhash
• change hash type to int64_t
• expand exp(m/n*pi*I) with trig functions if they can be expanded
• start changing libtool version with each release
• performance: in exp_eval check for Pi and I before trying to divide
• performance: much less canonicalizations of GMP rationals
• performance: cache pseries coeff accesses in pseries::mul_series
• performance: GinacFunctions for cot/acot
• C++11: add override where possible

pynac-0.5.3 (Dec 18, 2015)

• fix gmp linking and .pc file

pynac-0.5.2 (Nov 27, 2015)/pynac-0.5.1 (Nov 25, 2015)

• bugfix release

pynac-0.5.0 (Oct 16, 2015)

• libgmp bigints and bigrats instead of ZZ and QQ Python objects
• assumptions/domains can influence Pynac computation (changes versus 0.3.9.5 following)
• C++11 results in better code readability
• better decisions through more info flags and logic
• return not implemented and undecidable for some decisions
• add inexact flag for possible expansions / FP simplifications
• abs() expansion
• function::info()
• from GiNaC: Fix pow(+(...),2).expand()
• remove some unused files and other cleanup; add missing autoconf macro;
• some older memleaks closed

pynac-0.3.9.5 (Sep 13, 2015)

• revert math. logic changes for now (they are still in master)
• fix regression with rational multiples of pi
• fix dbgprinttree() of functions
• performance fixes

pynac-0.4.3 (Jul 31, 2015)

• better decisions through more info flags and logic
• return not implemented and undecidable for some decisions
• fix performance issue with real/imag of powers
• more rational multiples of pi as argument to sin,cos,tan expanded
• remove realsymbol and possymbol

pynac-0.3.9.3 (Jul 31, 2015)

• fix regression in arithmetic with positive characteristic ring elements
• better decisions through more info flags and logic
• return not implemented and undecidable for some decisions
• fix performance issue with real/imag of powers
• more rational multiples of pi as argument to sin,cos,tan expanded

pynac-0.4.2 (Jul 11, 2015)

• better arithmetic with positive characteristic ring elements
• fix is_zero bug, affecting comparisons
• better nonnumeric comparisons with infinity
• add integer domain, propagate to symbol info
• add inexact flag for possible expansions / FP simplifications

pynac-0.3.9.2 (Jul 11, 2015)

• better arithmetic with positive characteristic ring elements
• fix is_zero bug, affecting comparisons
• better nonnumeric comparisons with infinity
• add integer domain, propagate to symbol info

pynac-0.4.1 (Jun 10, 2015)

• abs() expansion
• function::info()
• from GiNaC: Fix pow(+(...),2).expand()
• remove some unused files and other cleanup; add missing autoconf macro;
• C++11:
• more auto instead of iterator declarations
• get usage of smart pointers right
• more range-based loop modernization

pynac-0.4.0 (May 28, 2015)

• requires >=gcc-4.6 or equivalent with -std=c++11
• C++11:
• manual switch from auto_ptr to unique_ptr
• applied clang-modernize to use auto, nullptr, range-based loops, pass-by-value via move

pynac-0.3.9 (May 28, 2015)

• fix Python includes

pynac-0.3.8 (May 18, 2015)

• several abs() additions and fixes
• pynac now compiles with Python3 headers too
• from GiNaC: power::expand() (x*p)^c -> x^c * p^c, if p>0
• merge numeric and Number_T classes

pynac-0.3.7 (May 04, 2015)

• unhandled print order comparisons now call generic code instead of throwing exceptions
• fix bug in adds with simplified numerics
• check if infinity direction is numeric before comparing to zero

pynac-0.3.6 (April 30, 2015)

• treat muls and powers only with integer +/- one as special
• 0^0 is no longer an error
• latest version of AX_PYTHON_DEVEL macro

pynac-0.3.5 (April 17, 2015)

• revert GiNaC commit interfering with Pynac print order
• fix code that produced warnings

pynac-0.3.3 (April 11, 2015)

• fixed the series expansion of zeta(s) around 1
• print_latex of wildcards
• clear the libtool versioning scheme
• sync with current GiNaC as much as possible

pynac-0.3.2 (March 20, 2014)

• memory leaks fixed
• framework for explicit template instantiation
• implement function::subs() callback into Python
• merging branch evalf_dict

pynac-0.3.1 (September 29, 2013)

• Implement Pynac->Python callback for function::subs() Sage issue #14800
• Change argument of evalf to an arbitrary dict Sage issue #12289
• Use \cdot to separate coefficient from following digit in latex mul output Sage issue #13356

pynac-0.3.0 (May 10, 2013)

• Fix ordering used to print symbolic expressions Sage issue #9880

pynac-0.2.6 (November 20, 2012)

• Fix infinite loop in content normalization of add objects within mul::eval (Pynac issue #12) (Sage issue #13609)
• Fix fallout from infinities rewrite where expairseq eagerly simplified infinity objects in its contructor. (Pynac issue #14) (Sage issue #13587)
• Fix printing of parenthesis around exponents of power objects. (Reported and fixed by Sebastien Gouezel.)

pynac-0.2.5 (July 9, 2012)

• Build system improvements by Julien Puydt.
• Less verbose output during build.
• Fix detection of Python.
• Do not include release version in library name.
• Fix infinite loop in power::eval.

pynac-0.2.4 (May 15, 2012)

• Evaluate psi1 numerically if argument is not crational.
• Infinities rewrite by Volker Braun.
• beta() remains symbolic if both arguments are crational.
• Fix unarchiving of symbolic functions defined at runtime without any custom methods.
• Use PyObject_Cmp to compare numerics wrapping Python objects.
• Make atan2(0,0) throw error. (Sage Trac #11423)
• correctly handle complex numbers in numeric::info(nonnegative).
• Add method to ex for counting number of symbols in an expression.

pynac-0.2.3 (May 31, 2011)

• Remove extra braces printed when typesetting mul objects.
• Fix mul::conjugate().
• Fix tests for custom evaluation functions defined in Python to use bitwise and.

pynac-0.2.2 (May 9, 2011)

• Merge patches from upstream with the following:
• Sage issue #9981 where (5-e^x).substitute(x=log(x)) gave 5-log(x)
• Sage issue #9947 where add.eval() did not canonicalize expression properly
• Sage issue #8943, series expansion can handle some trivial singularities now
• conjugate functions for sinh, cosh and tanh
• bunch of fixes for msvc compiler

pynac-0.2.1 (September 12, 2010)

• Print rational functions and mul objects better.
• Include patches from GiNaC to fix memory leaks in power::eval and improve conjugation of special functions.
• Allow disabling automatic evaluation in add and mul constructors.
• zeta(1) now returns UnsignedInfinity.
• Fix csgn function to conform to the original GiNaC specification.
• Do not generate function.{h,cpp} automatically.
• Fix latex typesetting of rational functions. #9314

pynac-0.2.0 (May 5, 2010)

• Add support for GCC 4.5.0.
• Move Sage interface functions to a function table, to add Cygwin support.
• Add autoconf macros to detect Python.
• Import GiNaC patch to make binomial(n,0) -> 1.
• Remove extra parenthesis when typesetting rational fractions.

pynac-0.1.12 (April 12, 2010)

• Apply upstream patches to fix “division by zero” error on atan2(-pi,0).
• Apply upstream patches to fix incorrect use of STL iterators.

pynac-0.1.11 (January 19, 2010)

• Fix unarchiving overloaded functions.
• Move numeric evaluation of log higher in eval.
• Fix serious bug in printing where coefficients were printed with -, but not negated.
• Change typesetting of rational functions to separate the numerator and denominator of the coefficient as well.
• Speed up real_part() by removing calls to is_real().
• Allow overriding builtin function custom methods from python.
• Allow setting domain and latex_name of symbols.
• Improve deduction capabilities of info() for arithmetic classes.

pynac-0.1.10 (November 22, 2009)

• Minor changes to auto* files to make them work with libtool-2.
• Fix hash collisions for fderivatives yet again.
• Fix segfault when mul tries to simplify powers of exp.
• Latex typesetting of nested powers print valid latex code.
• Latex typesetting of add and mul uses \left( and \right).

pynac-0.1.10.a0 (November 19, 2009)

• Pass parent instead of precision to custom evalf methods.
• Pass function instance to custom methods of functions.
• Change typesetting to match Sage conventions.
• Handle exceptions while autoevaluating exp.

pynac-0.1.9 (September 22, 2009)

• Only simplify exp(a)^b -> exp(a*b) when b is an integer.
• Fix latex printing of log to \log (was \ln).
• Fix hash collision for fderivatives.
• Fix comparison of fderivatives and functions.
• Allow numeric approximation of functions on inexact input again.
• Change printing of lgamma to log_gamma and \log \Gamma.

pynac-0.1.9.p0 (September 24, 2009)

• Put parenthesis around exp when printing powers.

pynac-0.1.8.p2 (August 1, 2009)

• Fix latex typesetting of conjugate(), real_part() and imag_part().
• When calculating hash of fderivative use paramset to avoid collisions.
• Add support for infinity to functions defined in inifcns_trans.cpp.
• Add parameter to disable application of chain rule while differentiating symbolic functions.

pynac-0.1.8.p0 (June 14, 2009)

• Fix serious bug in comparison of mul and pow objects.
• Conjugates of symbolic functions no longer just apply conjugate to the arguments.
• Latex printing of exp now works correctly.
• Better error handling for calls to python printing functions.
• polylog prints as Li to match Sage.

pynac-0.1.8 (June 4, 2009)

• Add error handling for py_get_constant.
• Simplify exp(a)*exp(b) -> exp(a+b)
• Revert previous changes to symbol::calchash

pynac-0.1.7 (May 18, 2009)

• Many fixes needed to make Pynac work as the default system for symbolic manipulation in Sage.

pynac-0.1.6 (May 6th, 2009)

• Fix error handling in Number_T::hash().
• Add support for archiving numeric and function objects.
• Fix comparison bug in mul.
• Fix gcc warnings about conversion of strings to char*.
• Change exp to not prints exponents of 1.
• Add power method to exp so that (e^x)^y -> e^(x*y).

pynac-0.1.5 (April 13th, 2009)

• Change printing of pi (Pi -> pi)
• Delay evaluation of special functions until .evalf() is called
• Add precision parameter to .evalf()

pynac-0.1.4 (April 11th, 2009)

• Add support for arithmetic with infinity.
• Use python repr function for printing numeric objects.
• Print paranthesis in latex mode with \left and \right.
• Call python for latex names of symbols.
• Support calling user specified python functions to print function instances.
• Call python for printing function and fderivative.

pynac-0.1.3 (February 26th, 2009)

• Fix serious bug in expairseq::compare_same_type which resulted in wrong simplifications.
• Remove dependencies on lex, yacc, and dlopen.

pynac-0.1.2 (January 30th, 2009)

• factorial now prints as factorial(n), not n!.
• Change comparison functions to make higher degree terms print first.
• functions (and fderivatives) now print after other types.
• Add latex printing for binomials.
• exp is now printed as e^x.
• Change the way rational functions are printed to match Sage.

pynac-0.1.1.p0 (January 20th, 2009)

• add OSX 64 bit build support

pynac-0.1.1 (October 15th, 2008)

• Allow python functions to provide custom evaluation, derivative, series expansion, etc. functionality of symbolic functions
• Change names of more files to prevent clashing with a ginac installation.
• Fix several bugs when working with modular coefficients.

pynac-0.1.p0 (September 20th, 2008)

• Change library name, include file location to reflect the package name and not conflict with ginac
• Change library version numbers to reflect package version
• Fix build problems where autoheader was run

pynac-0.1 (August 8th, 2008)

• Summary of changes from GiNaC:
• GiNaC::numeric was replaced completely to rely on Python and Sage types instead of CLN.
• Use Pari via Sage to compute numerical values for special functions.
• Printing order is consistent between different runs.
• Inverse trig functions print with “arc” instead of “a”