Does anyone have a better idea for how to canonicalize the args for
Add (perhaps Mul, too).
>>> from sympy.abc import *
>>> from sympy import *
>>> 3*x+6*y
3*x + 6*y
>>> _.args
(3*x, 6*y)
>>> (x+2*y).args
(2*y, x)
>>> (2*x+2*y+z).args
(2*y, z, 2*x)
>>>
Speed needs to be considered too.
Aaron Meurer
On Fri, May 27, 2011 at 6:22 AM, smichr wrote:
> Does anyone have a better idea for how to canonicalize the args for
> Add (perhaps Mul, too).
>
> >>> from sympy.abc import *
> >>> from sympy import *
> >>> 3*x+6*y
> 3*x + 6*y
> >>> _
The reason for the apparent arbitrariness is that Add uses key=hash (for
speed) while Mul uses Basic.compare.
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Hi,
On 27 May 2011 23:27, Chris Smith wrote:
> The reason for the apparent arbitrariness is that Add uses key=hash (for
> speed) while Mul uses Basic.compare.
It seems we just overlooked Basic.compare in Mul. I git blame
sympy/core/mul.py and the line with Basic.compare didn't change since the
Hi,
On 27 May 2011 14:22, smichr wrote:
> Does anyone have a better idea for how to canonicalize the args for
> Add (perhaps Mul, too).
>
>>>> from sympy.abc import *
>>>> from sympy import *
>>>> 3*x+6*y
>3*x + 6*y
>>>> _.args
>(3*x, 6*y)
>>>> (x+2*y).args
>(2*y,
Hi,
On 28 May 2011 08:45, Mateusz Paprocki wrote:
> Hi,
>
> On 27 May 2011 23:27, Chris Smith wrote:
>
>> The reason for the apparent arbitrariness is that Add uses key=hash (for
>> speed) while Mul uses Basic.compare.
>
>
> It seems we just overlooked Basic.compare in Mul. I git blame
> sympy/
+1 to as_ordered_args. I think for most places that use .args the
order doesn't really matter. Those should use .args, and the slower
.as_ordered_args should only be used in the cases where the order does
matter.
It would be nice if there were a function that were just as fast as
hash that wasn'
