Hello.
All the receipts in this dicussion look very interesting.Maybe all of this
ones could be put in the official documentation.
Christophe BAL
2014-06-06 13:34 GMT+02:00 Andrei Berceanu <andreiberce...@gmail.com>:
> The unflatten_mul function factorized the 2, but not the g, i.e. it returns
>
> 2(g*|psi1|**2 + g*|psi2|**2)
>
> instead of
>
> 2g*(|psi1|**2 + |psi2|**2)
>
>
> On Friday, June 6, 2014 1:07:26 PM UTC+2, F. B. wrote:
>
>>
>>
>> On Friday, June 6, 2014 12:22:14 PM UTC+2, Andrei Berceanu wrote:
>>>
>>> Tnx!
>>> I think there is an error in the line (unbalanced paranthesis):
>>>
>>> return node.xreplace ({e: S.One, conjugate(e): S.One})*abs(e)**2)
>>>
>>>
>> Yes, sorry, just remove the last parenthesis.
>>
>>
>>
>>> Also, do you know how I can force the factorization of the 2*g to get
>>> 2*g(|psi1|**2 + |psi2|**2)?
>>>
>>>
>> Try this one:
>>
>> import collections
>>
>> def unflatten_mul(node):
>> d = collections.defaultdict(lambda: [])
>> new_args = []
>> for arg in node.args:
>> if arg.args and arg.args[0].is_Number:
>> d[arg.args[0]].append(arg.func(*arg.args[1:]))
>> continue
>> new_args.append(arg)
>> print d
>> for key, item in d.items():
>> new_args.append(Mul(key, Add(*item), evaluate=False))
>> return node.func(*new_args, evaluate=False)
>>
>>
>> apply this function on *expr*, it should work.
>>
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