SymPy 0.6.6 released

SymPy 0.6.6 has been released on December 20, 2009. It is available at

http://sympy.org

The source distribution can be downloaded from:
http://sympy.googlecode.com/files/sympy-0.6.6.tar.gz

You can get the Windows installer here:
http://sympy.googlecode.com/files/sympy-0.6.6.win32.exe

And the html documentation here:
http://sympy.googlecode.com/files/sympy-0.6.6-docs-html.zip

About SymPy

SymPy is a Python library for symbolic mathematics. It aims to become a full-featured computer algebra system (CAS) while keeping the code as simple as possible in order to be comprehensible and easily extensible. SymPy is written entirely in Python.

Changes since last stable release

• many documentation improvements, including docstrings and doctests
• new assumptions system (GSoC) (See assumptions documentation for more information or have a look at Fabian's blog.)
• Note: This is going to replace the old assumption system. It is encouraged to use it for new code, however it is not completely finished and parts of sympy have yet to be rewritten to use it; this scheduled for the 0.7 release.
• improvements to test runner
• printing improvements (especially LaTeX, but also mathml and pretty printing)
• discriminant of polys
• block diagonal methods for matrices
• vast improvements to solving of ODEs (GSoC) (See ODE documentation for full details or Aaron's blog).
• logcombine function
• improvements to sets
• better trigonometric simplification
• improvements to piecewise functions
• improvements to solve() and nsolve()
• improvements to as_numer_denom()
• much better quartic and cubic polynomial rootfinding
• code refactoring and cleanup
• physics: coupled clusters and wick expansion
• matrices: symbolic QR solving
• mpmath updated
• pyglet updated
• many, many bug fixes and small improvements

The following 22 people have contributed patches to this release (sorted alphabetically):

• Aaron Meurer
• Alan Bromborsky
• Andy R. Terrel
• Bill Flynn
• Chris Smith
• Eh Tan
• Fabian Pedregosa
• Fredrik Johansson
• Jorn Baayen
• Julio Idichekop Filho
• Kevin Goodsell
• Łukasz Pankowski
• Luke Peterson
• Øyvind Jensen
• Ondrej Certik
• Oscar Benjamin
• Priit Laes
• Renato Coutinho
• Ronan Lamy
• Ryan Krauss
• Ted Horst
• Toon Verstraelen
• Vinzent Steinberg

The following 10 people helped reviewing patches:

• Aaron Meurer
• Andy R. Terrel
• Chris Smith
• Fabian Pedregosa
• Fredrik Johansson
• Luke Peterson
• Mateusz Paprocki
• Ondrej Certik
• Ronan Lamy
• Vinzent Steinberg

SymPy 0.6.5 released

SymPy 0.6.5 has been released on July 17, 2009. It is available at

http://sympy.org

Source distribution can be downloaded from
http://sympy.googlecode.com/files/sympy-0.6.5.tar.gz

Windows binaries can be downloaded from
http://sympy.googlecode.com/files/sympy-0.6.5.win32.exe


About SymPy

SymPy is a Python library for symbolic mathematics. It aims to become a full-featured computer algebra system (CAS) while keeping the code as simple as possible in order to be comprehensible and easily extensible. SymPy is written entirely in Python and does not require any external libraries.


Changes since last stable release

This release has been marked by improved documentation,
C code generation, solve and dsolve improvements, mpath update, a new
logic module and the start of Google's Summer of Code program.


Major changes include:

- Geometric Algebra Improvements
- Upgrade GA module with left and right contraction operations
- Add intersection test for the vertical segment,
reimplementation of convex_hull (Florian Mickler)

- Implement series() as function (Barry Wardell)

- Core improvements
- Refactor Number._eval_power (Fabian Pedregosa)
- fix bugs in Number._eval_power (Chris Smith)

- Matrix improvements:
- Improve jacobian function, introduce vec and vech (Ben
Goodrich)


- Solver improvements:
- solutions past linear factor found in tsolve (Chris Smith)
- refactor sympy.solvers.guess_solve_strategy (Fabian Pedregosa)
- Small cleanups to the ODE solver and tests. (Priit Laes)
- Fix corner case for Bernoulli equation. (Priit Laes)


- Improvements on partial differential equations solvers (Priit
Laes)
- Added separation of variables for PDEs (Priit Laes)


- Expand improvements (Aaron Meurer)
- Refactoring
- exp(x)*exp(y) is no longer automatically combined into
exp(x+y), use powsimp for that


- Documentation improvements:
- Test also documentation under doc/ (Fabian Pedregosa)
- Added many docstrings
- Fix Sphinx complaints/warnings/errors (Priit Laes)
- Doctest coverage (Ondrej Certik)


- New logic module (Fabian Pedregosa)
- Efficient DPLL algorithm (Fabian Pedregosa)


- LaTeX printer improvements:
- Handle standard form in the LaTeX printer correctly (Freddie
Witherde)
- Latex: _print_Mul fix (issue 1282) (Nicolas Pourcelot)
- Robust printing of latex sub and superscripts (Toon Verstraelen)
- sorting _print_Add output using a main variable (Ryan Krauss)
- Matrix printing improvements (Ryan Krauss)


- MathML printing improvements:
- MathML's printer extended (Thomas Sidoti)


- Testing framework improvements
- Make tests pass without the "py" module (Ondrej Certik)


- Polynomial module improvements:
- Fixed subresultant PRS computation and ratint() (Mateusz
Paprocki)
- Removed old module sympy.polynomials (Priit Laes)


- limit fixes:
Compute the finite parts of the limit of a sum by direct
substitution (Ronan Lamy)


- Test coverage script (Ronan Lamy)


- Code quality improvements (remove string exceptions, code quality
test improvements) (Tomasz Buchert)


- C code generation (Toon Verstraelen)


- Update mpmath (Fredrik Johansson, Vinzent Steinberg)


The following people submitted code for this release (sorted by number
of patches):

* Fabian Pedregosa
* Ondrej Certik
* Priit Laes
* Vinzent Steinberg
* Toon Verstraelen
* Tomasz Buchert
* Nicolas Pourcelot
* Aaron Meurer
* Florian Mickler
* Jochen Voss
* Alan Bromborsky
* Barry Wardell
* Riccardo Gori
* Chris Smith
* Freddie Witherden
* Ben Goodrich
* Ronan Lamy
* Akshay Srinivasan
* Johann Cohen-Tanugi
* Luke Peterson
* Mateusz Paprocki
* Ted Horst
* Thomas Sidoti
* Vinay Kumar

SymPy 0.6.4 released

SymPy 0.6.4 has been released on April 4, 2009. It is available at

http://code.google.com/p/sympy/

About SymPy

SymPy is a Python library for symbolic mathematics. It aims to become a full-featured computer algebra system (CAS) while keeping the code as simple as possible in order to be comprehensible and easily extensible. SymPy is written entirely in Python and does not require any external libraries.

Major changes in this release:

• robust and fast (still pure Python) multivariate factorization
• sympy works with pickle protocol 2 (thus works in ipython parallel)
• ./sympy test now uses our testing suite and it tests both regular tests and doctests
• examples directory tidied up
• more trigonometric simplifications
• polynomial roots finding and factoring vastly improved
• mpmath updated
• many bugfixes (more than 200 patches since the last release)

The following 21 people have contributed patches to this release (sorted by the number of patches):

• Ondrej Certik
• Mateusz Paprocki
• Fabian Seoane
• Andy R. Terrel
• Freddie Witherden
• Robert Kern
• Priit Laes
• Riccardo Gori
• Fredrik Johansson
• Aaron Meurer
• Alan Bromborsky
• Brian E. Granger
• Felix Kaiser
• Kirill Smelkov
• Vinzent Steinberg
• Akshay Srinivasan
• Andrew Docherty
• Andrew Straw
• Henrik Johansson
• Kaifeng Zhu
• Ted Horst

The following people helped review patches:

• Riccardo Gori
• Fabian Seoane
• Vinzent Steinberg
• Gael Varoquaux
• Fredrik Johansson
• Robert Kern
• Alan Bromborsky
• Ondrej Certik

There were 218 new patches since 0.6.3:

$ git log --pretty=oneline sympy-0.6.3..sympy-0.6.4 | wc -l
218

Plans for the future:

Our roadmap: http://wiki.sympy.org/wiki/Plan_for_SymPy_1.0