Hi,
In the course of implementing kauers algorithm I wanted to implement a
function that can take as input a term like summation(f(x), (x, 1, k)) and
outputs the f(x+1) that is the difference between (f(x), (x, 1, k + 1))
and (f(x), (x, 1, k)). Instead, it just returns "summation(f(x), (x, 1,
On Thu, Aug 30, 2012 at 8:02 PM, Saurabh Jha wrote:
> Hi,
>
> In the course of implementing kauers algorithm I wanted to implement a
> function that can take as input a term like summation(f(x), (x, 1, k)) and
> outputs the f(x+1) that is the difference between (f(x), (x, 1, k + 1)) and
> (f(x),
The question is, do we want Sum to automatically combine like that?
If not, then I would add it as a different method than __sub__.
Aaron Meurer
On Thu, Aug 30, 2012 at 8:51 AM, Chris Smith wrote:
> On Thu, Aug 30, 2012 at 8:02 PM, Saurabh Jha wrote:
>> Hi,
>>
>> In the course of implementing k
Doesn't this call for some sort of Sum_simplify?
I don't like the idea of overriding __sub__. I do like the idea of looking
at an expression tree and seeing if it can be simplified. Is there a
mechanism in SymPy to write down these simplifications and have them
applied when you call simplify? I'm
On Thu, Aug 30, 2012 at 10:28 PM, Aaron Meurer wrote:
> The question is, do we want Sum to automatically combine like that?
> If not, then I would add it as a different method than __sub__.
>
`_eval_expand_basic`, perhaps?
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This doesn't really make sense as expansion, though.
This is closely related to
http://code.google.com/p/sympy/issues/detail?id=2297.
Aaron Meurer
On Aug 30, 2012, at 12:37 PM, Chris Smith wrote:
> On Thu, Aug 30, 2012 at 10:28 PM, Aaron Meurer wrote:
>> The question is, do we want Sum to aut
On Fri, Aug 31, 2012 at 12:41 AM, Aaron Meurer wrote:
> This doesn't really make sense as expansion, though.
>
> This is closely related to
> http://code.google.com/p/sympy/issues/detail?id=2297.
>
If you expanded the sums you would obtain the single `f(x+1)`-like
term. It's just a thought and `
This also doesn't work well with expand() because the method would
have to be on Add to work. I think the best solution would be to
write a function that takes an expression with summations and tries to
combine them.
Aaron Meurer
On Thu, Aug 30, 2012 at 12:59 PM, Chris Smith wrote:
> On Fri, Au
