thnx, luis,
thats nearly what I'm looking for, but i missed something in my first post.
in my fractions i work with some variable (with are all integer, that's
why I missed this in the beginning)
I'd like to have something like this:
a,b = var('a,b')
v = vector([2/a, 1/ab])
and with the results:
vector_of_nums = (2b,1)
common_denom = ab
but I've to test if this is possible with you or yanns solution.
Johannes
Am 27.09.2010 17:53, schrieb luisfe:
> On Sep 27, 3:34 pm, Johannes <dajo.m...@web.de> wrote:
>
>> Hi list,
>> is there a way to get a sum of fraction to a common devisor? or even
>> better into a product of a fraction like \frac{1}{something here} and a
>> sum of integers?
>> and my next step would be this, i dont have a single value, which i want
>> to get as the above produkt, but i've got a vector for wich i want to
>> write as produkt of a skalar times an integervektor.
>> how can i do this?
>>
>> greatz Johannes
>>
> Hi,
>
> Is this what you want?
>
> sage: v = vector([2/3,1/4,0])
> sage: common_denom = denominator(v)
> sage: common_denom
> 12
> sage: vector_of_nums = v * common_denom
> sage: vector_of_nums
> (8, 3, 0)
>
> note that here, internally, vector of nums is a vector with rational
> entries. If you want a vector of sage integers you could do
>
> sage: vector_of_nums = vector_of_nums.change_ring(ZZ)
>
> And you will have a vector with Integer entries, if you need this last
> command or not depends on what do you want to do with your vector.
>
> Luis
>
>
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