Release Notes for 0.7.5
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These are the release notes for SymPy 0.7.5, which was released on February 22, 2014.
This version of SymPy has been tested on Python 2.6, 2.7, 3.2, 3.3, and PyPy.
The version of mpmath included in SymPy has been updated to 0.18.
New routines for efficiently compute the dispersion of a polynomial or a pair thereof.
Fancy indexing of matrices is now provided, e.g.
A[:, [1, 2, 5]]selects all rows and only 3 columns.
Enumeration of multiset partitions is now based on an implementation of Algorithm 184.108.40.206M from Knuth's The Art of Computer Programming. The new version is much faster, and includes fast methods for enumerating only those partitions with a restricted range of sizes, and counting multiset partitions. (See the new file sympy.utilities.enumerative.py.)
distancemethods were added to Line and Ray to compute the shortest distance to them from a point.
normal_linesmethod was added to Ellipse to compute the lines from a point that strike the Ellipse at a normal angle.
det_quickwere added as functions in solvers.py to facilitate fast solution of small symbolic matrices; their use in solve has reduced greatly the time needed to solve such systems.
solve_univariate_inequalityhas been added to sympy.solvers.inequalities.py.
as_setattribute for Relationals and Booleans has been added.
Several classes and functions strictly associated with vector calculus were moved from
sympy.physics.mechanicsto a new package
sympy.physics.vector. (PRs #2732 #2862 #2894)
New implementation of the Airy functions
Biand their derivatives
airybiprime, respectively). Most of the usual features of SymPy special function are present. Notable exceptions are Gruntz limit computation helpers and meijerg special functions integration code.
Euler-Lagrange equations (function
euler_equations) in a new package
Some improvements to the gamma function.
generate_bellnow generates correct permutations for any number of elements.
It is no longer necessary to provide
nargsto objects subclassed from Function unless an
evalclass method is not defined. (If
evalis defined, the number of arguments will be inferred from its signature.)
Pointcreation will be faster since simplification is done only on Floats
Some improvements to the intersection method of the Ellipse.
solutions from solve of equations involving multiple log terms are more robust
idiffcan now return higher order derivatives
sympy.physics.dyadic.Dyadic. (PR #2686).
Printing improvements for
sympy.physics.vectorobjects and mechanics printing. (PRs #2687, #2728, #2772, #2862, #2894)
Functions with LaTeX symbols now print correct LaTeX. (PR #2772)
init_printinghas several new options, including a flag
print_builtinto prevent SymPy printing of basic Python types (PR #2683), and flags to let you supply custom printers (PR #2894).
improvements in evaluation of
imagesetfor Intervals (PR #2723).
Set properties to determine boundary and interior (PR #2744).
input to a function created by lambdify no longer needs to be flattened.
Backwards compatibility breaks and deprecations
submatrixmethod of matrices was removed; access the functionality by providing slices or list of rows/columns to matrix directly, e.g.
A[:, [1, 2]].
Matrix([])now both return a 0x0 matrix
terms_gcdno longer removes a -1.0 from expressions
extract_multiplicativelywill not remove a negative Number from a positive one, so
(4*x*y).extract_multiplicatively(-2*x)will return None.
the shape of the result from
M.cross(B)now has the same shape as matrix M.
The factorial of negative numbers is now
0. This is consistent with the definition
factorial(n) = gamma(n + 1).
zoo.is_number is True(PR #2823).
oo < Iraises
TypeError, just as for finite numbers (PR #2734).
1**oo == naninstead of
1, better documentation for Pow class (PR #2606).
The following people contributed at least one patch to this release (names are given in alphabetical order by last name). A total of 34 people contributed to this release. People with a * by their names contributed a patch for the first time for this release; 11 people contributed for the first time for this release.
Thanks to everyone who contributed to this release!
- Tuomas Airaksinen
- Shipra Banga*
- Francesco Bonazzi
- Raoul Bourquin
- Ondřej Čertík
- Pramod Ch*
- Björn Dahlgren
- Avichal Dayal*
- Gilbert Gede
- James Goppert*
- Alexey U. Gudchenko
- Harsh Gupta
- Randy Heydon
- Sachin Joglekar
- Sergey B Kirpichev
- Stephen Loo
- Aaron Meurer
- Jonathan Miller*
- Jason Moore
- Khagesh Patel
- Thilina Rathnayake
- Timothy Reluga
- Julien Rioux
- Matthew Rocklin
- Rajath S*
- Paul Scott*
- Buck Shlegeris*
- Chris Smith
- Paul Strickland*
- Ramana Venkata