notes-0.5.13.rst

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