SymPy 0.5.13

6 Mar 2008

• SymPy is now 2x faster in average compared to the previous release

  • first patches with 25% speedup

  • Basic.cos et. al. removed, use C.cos instead

  • sympy.core now uses direct imports

  • sympifyit decorator

  • speedup Integers creation and arithmetic

  • speedup unary operations for singleton numbers

  • remove silly slowdowns from fast-path of mul and div

  • significant speedup was achieved by reusing dummy variables

  • is_dummy is not an assumption anymore

  • Symbols & Wilds are cached

  • ((2+3*I)**1000).expand() is now at least 100x faster

  • .expand() was made faster for cases where an expression is already expanded

  • rational powers of integers are now computed more efficiently

  • unknown assumptions are now cached as well as known assumptions

• integrate() can handle most of the basic integrals now

• interactive experience with isympy was improved through adding support for , () and {} to pretty-printer, and switching to it as the default ipython printer

• new trim() function to map all non-atomic expressions, ie. functions, derivatives and more complex objects, to symbols and remove common factors from numerator and denominator. also cancel() was improved

• .expand() for noncommutative symbols fixed

• bug in (x+y+sin(x)).as_independent() fixed

• .subs_dict() improved

• support for plotting geometry objects added

• bug in .tangent_line() of ellipse fixed

• new atan2 function and assotiated fixes for .arg() and expanding rational powers

• new .coeff() method for returning coefficient of a poly

• pretty-printer now uses unicode by default

• recognition of geometric sums were generalized

• .is_positive and .is_negative now fallback to evalf() when appropriate

• as the result oo*(pi-1) now correctly simplifies to oo

• support for objects which provide __int__ method was added

• we finally started SymPy User’s Guide

• BasicMeths merged into Basic

• cache subsystem was cleaned up – now it supports only immutable objects