notes-0.14.rst

Diofant 0.14

Not Released Yet

New features

• Support calculating limits with ~diofant.functions.elementary.piecewise.Piecewise functions and boolean expressions, see 1214 and 1218.
• Support directional limits on the complex plane, see 1232.

Major changes

• Use recursive (former poly() method, without using ~diofant.core.function.expand) algorithm of creating polynomials from expressions, see 1047.

Compatibility breaks

• Removed support for CPython 3.9, see 1192.
• Removed to_mpi() method of ~diofant.sets.sets.Interval, see 1194.
• Removed poly() function, use ~diofant.core.expr.Expr.as_poly method to create a ~diofant.polys.polytools.Poly instance from ~diofant.core.expr.Expr, see 1047.
• Removed functions bool_map(), POSform() and SOPform(), see 04ea41a220 and be319badf5.
• Changed semantics of the dir kwarg for the ~diofant.calculus.limits.Limit, now '+' is -1, '-' is 1 and 'real' is ~diofant.sets.fancysets.Reals, see 1234 and 1235.
• Removed diofant.calculus.euler and diofant.calculus.finite_diff modules, see 1271.
• Removed diofant.vector module, see 1274.
• Removed diofant.diffgeom module, see 1281.
• Removed diofant.stats module, see 1276.
• Removed diofant.geometry module and line_integrate function, see 1283.
• Removed diofant.plotting module, see 1284.
• Removed unused prefixes, postfixes, capture and variations functions, see 1282 and 1290.
• Drop support for multivariate ~diofant.calculus.order.Order notion, see 1296.
• Removed Add.extract_leading_order method, see 1292.

Minor changes

• Support unevaluated ~diofant.polys.rootoftools.RootOf's over finite fields, see 1209.
• Provide default clause (condition ~diofant.logic.boolalg.BooleanTrue) for ~diofant.functions.elementary.piecewise.Piecewise, see 1215.

Developer changes

• Drop dependency on the flake8-rst and depend on the flake518 instead, see 1268.

Issues closed

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

These Sympy issues also were addressed:

• 22487: [integrals] Wrong result for Integral((cos(x*2)-cos(x))/x*2, (x, -oo, oo))
• 22493: Series expansion introduces new variables
• 22558: Error in ODE-Solver-Documentation
• 22837: Solve simplest algebraic equations with dummy parameter
• 22836: Series: Possible improvements for Order of expressions involving factorials
• 22788: RecursionError for unevluated expression in latex
• 22863: Hangs: integrate((3*x*3-x2+2x-4)/sqrt(x*2-3x+2), (x, 0, 1))
• 22862: Problem with separable differential equation
• 22893: 'limit' in combination with 'positive=True' gives wrong result
• 22878: RecursionError in trigsimp
• 22982: limit((log(E + 1/x) - 1)**(1 - sqrt(E + 1/x)), x, oo) returns 0 instead of oo
• 22986: limit(acosh(1 + 1/x)*sqrt(x), x, oo) is evaluated incorrectly.
• 14433: x not in QQ.frac_field(1/x)
• 23069: integrate(r*4sqrt(1 - r**2), (r, 0, 1)) gives incorrect result
• 19639: TypeError in integrate
• 23086: Incorrect result of simplify
• 23156: sympy.Sum() bug when summing up reciprocal of gamma
• 23174: Problem with gf_edf_zassenhaus()
• 21409: Printing of polynomial over FF
• 22673: Roots of a polynomial over a finite field computed regardless of specified polynomial domain
• 12531: cancel does not return expanded form
• 6322: degree((x+1)**10000) takes too long
• 22583: is_polynomial right for wrong reasons (and sometimes wrong)
• 23202: Dropping "all" __ne__ methods?
• 23223: Wrong integration results of trigonometric functions
• 23224: Python code printer not respecting tuple with one element
• 23231: Sympy giving the wrong solution
• 14387: Tutorial on limits creates impression that they are two-sided by default
• 8166: Limit assumes function is continuous?
• 14502: Problem with limit including factorial.
• 18492: Limit of Piecewise function - NotImplementedError: Don't know how to calculate the mrv
• 23266: Regression(?) in 1.10 for limits
• 7391: Limits for expressions with undetermined functions give wrong results
• 23287: Regression in is_integer for Mul of Pow
• 11496: Wrong result in limit calculation of limit(erfc(ln(1/x)),x,oo)?
• 3663: series expansion of acosh and acoth
• 23299: Sympy is unable to integrate this
• 23319: testing limit of n*tan(pi/n) results in incorrect answer in 1.7rc1+
• 5539: Equal Integrals compare different when using different variables
• 23425: PolynomialError when I try to call classify_ode
• 23432: Series expansion around float fails with NotImplementedError
• 8433: limit involving error function returns bad result
• 13750: erf has wrong limit in -oo
• 23497: binomial(-1, -1) returns 0, should return 1
• 23562: In new version of sympy, dsolve does not give a solution when another derivative is involved
• 23585: FiniteSet documentation inconsistent with usage in sympy
• 23596: Integral of real function has complex result
• 23605: Inefficiency in the Integrator with a Rational Expression
• 23637: Missing solutions from polynomial system (various solvers)
• 23479: Sparse poly gcd fails with HeuristicGCDFailed('no luck')
• 22605: Incorrect result from minpoly(cos(pi/9))
• 23677: minimal_polynomial fails for very complicated algebraic number
• 23836: Incorrect results for limits of Piecewise at discontinuity
• 23845: Gruntz should have been free of _w, value error, recursion error
• 23855: linsolve gives odd result if symbols are duplicated
• 24067: incorrect limit in simple parametric rational polynomial
• 24127: Error on all limits with Piecewise
• 23702: Cannot specify ODE initial conditions as just f(0)
• 23707: AttributeError in integral
• 24210: Error on limits regarding terms like (1+u)^v.
• 24225: Multivariable limit should be undefined, but gives unity.
• 24266: Changed behaviour of series() involving exp, I
• 24331: Limit of log(z) as z goes to 0 with z complex returns '-oo' instead of 'zoo'
• 23766: Factor hangs on exponential functions with base e
• 24360: Remove usage of numpy.distutils in autowrap module
• 24346: factor with extension=True fails for rational expression
• 20913: Poly(x + 9671406556917067856609794, x).real_roots() is slow
• 24386: sympy.limit yields wrong limit in sigmoidal expression
• 24390: Incorrectly evaluated expression
• 24461: sympy.polys.polyerrors.HeuristicGCDFailed: no luck -- when multiplying two Polys
• 24543: Rational calc value error
• 6326: PolynomialRing should not derive from CharacteristicZero
• 24684: Unable to evaluate erfcinv
• 6822: Multivariate Order()
• 24477: Expand before integrate gives different results with big O
• 24928: simplify(asinh(2)-oo)->0