Hi Chris,
On Apr 18, 12:01 pm, smichr <smi...@gmail.com> wrote:
> Hi Ben,
>
> I tried the original expressions that you posted and this takes 9
> minutes on my pretty modest machine with branch 1766 (on which I've
> reworked the expand quite a bit). Try
>
> numer = (first*second - third**2).expand(mul=1)
>
> and see what you get there.
>
> /c
I hit a problem with your 1766 branch on github just now
bgoodr...@room320:/tmp/smichr-sympy-8279aa7$ ./bin/isympy
Traceback (most recent call last):
File "./bin/isympy", line 80, in <module>
from sympy.interactive import init_session
File "./sympy/__init__.py", line 22, in <module>
from sympy.core import *
File "./sympy/core/__init__.py", line 4, in <module>
from basic import Basic, Atom, S, C
File "./sympy/core/basic.py", line 1774, in <module>
from sympy.core.symbol import Symbol, Wild
File "./sympy/core/symbol.py", line 3, in <module>
from expr import Expr
File "./sympy/core/expr.py", line 1262, in <module>
from mul import Mul
File "./sympy/core/mul.py", line 5, in <module>
from sympy.utilities.iterables import make_list, iff
File "./sympy/utilities/__init__.py", line 5, in <module>
from iterables import (iff, make_list, flatten, subsets,
numbered_symbols,
File "./sympy/utilities/iterables.py", line 33
return expr.func(*[rebuild(a, new) for a in expr.args],
evaluate=evaluate_basic)
^
SyntaxError: invalid syntax
Mateusz's suggestions are working well for me, just ugly. And it is
still slow and RAM-hungry when you convert a big sdp polynomial back
into basic SymPy form at the end, but maybe your work on expand / core
will help a bit with that.
Thanks,
Ben
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