Diofant 0.11

Not Released Yet

New features

• Added discrete_log() to compute discrete logarithms, see #785. Thanks to Gabriel Orisaka.

Major changes

• Poly now use sparse polynomial representation (via PolyElement) internally, see #795.

Compatibility breaks

• Removed support for Python 3.5 and 3.6, see #775.

• is_monomial attribute of Poly renamed to is_term, see #780.

• Removed log() helper from RationalField, see #787.

• Removed seterr() function, see #794.

• Removed DMP class, see #795.

• Removed ring_series module, see #820.

• Equality doesn’t support single-argument call, see #828.

• Removed is_nonnegative() and is_nonpositive() methods of Domain subclasses, see #834.

• Former fast=True option is now a default for intervals() and refine_root(), see #834.

• Change order of keyword arguments for integrate(), see #834.

Minor changes

• Support truncation for elements of RealAlgebraicField to int, see #788.

• Matrix’s and Array’s support symbolic indexes, see #785. Thanks to Francesco Bonazzi.

Developer changes

• Depend on sphinxcontrib-bibtex to track the bibliography, see #766.

Issues closed

See the release milestone for complete list of issues and pull requests involved in this release.

These Sympy issues also were addressed:

• sympy/sympy#15943 Wrong result from summation

• sympy/sympy#12163 matematica code printer does not handle floats and derivatives correctly

• sympy/sympy#11642 Geometric sum doesn’t evaluate with float base

• sympy/sympy#15984 Value error in limit

• sympy/sympy#7337 Wrong integration result

• sympy/sympy#11600 re and im should work for matrix expressions

• sympy/sympy#16038 solve_poly_system works with integers but not floats

• sympy/sympy#15553 rsolve can not solve this kind of recurrences

• sympy/sympy#11581 conjugate of real expression should not change expression

• sympy/sympy#11976 Typo in ellipse.py

• sympy/sympy#11275 LaTeX printer inconsistent with pretty printer

• sympy/sympy#11841 Function(‘gamma’) pretty prints as Γ

• sympy/sympy#11926 ccode does not accept user_functions for Max and Min

• sympy/sympy#11855 DiracDelta function is zero for nonzero arguments

• sympy/sympy#11955 diophantine gives wrong solution for -4*x**2+4*x*y-y**2+2*x-3

• sympy/sympy#11502 Discrete logarithms

• sympy/sympy#11435 str printing of logic expressions should use operators

• sympy/sympy#12200 coeff docstring is wrong

• sympy/sympy#9123 apart drops term

• sympy/sympy#12177 Wrong result with apart Wrong Result

• sympy/sympy#8129 The probability function does not handle expressions like b>=b

• sympy/sympy#9983 Product(1 + 1/n**(S(2)/3), (n, 1, oo)).doit() raise RunTimeError

• sympy/sympy#11726 pde_separate does not allow expressions as input

• sympy/sympy#11981 powsimp() fails with noncommutative variables

• sympy/sympy#12092 evalf does not call _imp_ recursively

• sympy/sympy#10472 pprint should align the middle of the matrix to the baseline?

• sympy/sympy#11959 diophantine gives wrong solution for -4*x**2+4*x*y-y**2+2*x-3

• sympy/sympy#11944 matrix vstack/hstack can fail with immutable matrix as first argument

• sympy/sympy#11732 Fails operators between Interval and some S.Sets

• sympy/sympy#12178 Empty intersection should be UniversalSet

• sympy/sympy#10681 TypeError: ‘Float’ object cannot be interpreted as an integer from integrate(r**2*(R**2-r**2)**0.5, r)

• sympy/sympy#11078 TypeError: ‘Float’ object cannot be interpreted as an integer from integrate((6-x*x)**(1.5))

• sympy/sympy#11877 integrate(log(0.5-x), (x, 0, 0.5)) wrongly produces imaginary part

• sympy/sympy#7337 Wrong integration result

• sympy/sympy#10211 integrate((1/sqrt(((y-x)**2 + h**2))**3), (x,0,w), (y,0,w)) is wrong

• sympy/sympy#11806 Incorrectly evaluating integral

• sympy/sympy#12325 string formatting error in dmp_integrate_in

• sympy/sympy#16222 Poly(E**100000000) is slow to create

• sympy/sympy#15413 rootof fails for polynomial with irrational coefficients

• sympy/sympy#16432 a.is_even does not imply a.is_finite

• sympy/sympy#16431 a.is_zero is False does not imply a.is_nonzero is True

• sympy/sympy#16530 (1/x).is_real should be None if x can be zero

• sympy/sympy#16562 Eq with 1 argument is allowed?

• sympy/sympy#16589 roots gives incorrect result