[IronPython] sympy on IP 2.6B2

[Jeffrey Sax]

I got sympy 0.6.5 running *without* frames by commenting out some lines:

sympy\__init__.py: line 44
# evalf._create_evalf_table()

Sympy\utilities\__init__.py: lines 14 and 18:
# from source import source
# from runtests import test, doctest

There are two more anomalies I'd like to report:


1. Performance

CPython 2.6:
>>> from time import time
>>> from sympy import Symbol, cos
>>> x = Symbol("x")
>>> a=time(); cos(x).diff(x,1000); time()-a
0.10899996757507324

IronPython 2.6b2:
>>> from time import time
>>> from sympy import Symbol, cos
>>> x = Symbol("x")
>>> a=time(); cos(x).diff(x,1000); time()-a
5.678321838378906

So IronPython is 50 times slower here on pure Python code.


2. Problem with '*' (splat operator)

Using the same setup code as above:

CPython 2.6:
>>> cos(x).series(x,0,10)
1 - x**2/2 + x**4/24 - x**6/720 + x**8/40320 + O(x**10)

IronPython 2.6b2:
>>> cos(x).series(x,0,10);
Traceback (most recent call last):
  File "C:\Program Files
(x86)\Python26\Lib\site-packages\sympy\core\basic.py", line 2139, in series
  File "C:\Program Files
(x86)\Python26\Lib\site-packages\sympy\core\basic.py", line 2206, in nseries
  File "C:\Program Files
(x86)\Python26\Lib\site-packages\sympy\core\function.py", line 308, in
_eval_nseries
  File "C:\Program Files
(x86)\Python26\Lib\site-packages\sympy\core\basic.py", line 2206, in nseries
  File "C:\Program Files
(x86)\Python26\Lib\site-packages\sympy\core\mul.py", line 753, in
_eval_nseries
  File "C:\Program Files
(x86)\Python26\Lib\site-packages\sympy\simplify\simplify.py", line 1008, in
powsimp
TypeError: __call__() argument after * must be a sequence, not generator

The offending line:
   newexpr = Mul(newexpr, Mul(*(Pow(b,e) for b, e in c_powers.items())))

Oddly enough, something like:

>>> def f(*args):
...     pass
...
>>> f(*(x for x in range(3)))

works fine, but

>>> from sympy import Mul
>>> Mul(*(x for x in range(3)))
	
does not. Mul is the type that represents a multiplication operation in
sympy.

Jeffrey

-----Original Message-----
From: users-bounces at lists.ironpython.com
[mailto:users-bounces at lists.ironpython.com] On Behalf Of Dino Viehland
Sent: July-24-09 4:50 PM
To: Discussion of IronPython
Subject: Re: [IronPython] sympy on IP 2.6B2

-X:FullFrames promotes all local variables into the heap.  So you can
always crawl the stack and look/change them for all methods.

-X:Frames only creates the frame objects and if something happens to
make us promote local variables (e.g. a closure, or a call to locals(),
exec, eval, dir(), vars()) then the local variables will be available
for that specific method.