[SciPy-Dev] Fwd: Re: GSoC 2017: BSpline support

[Xavier Barthelemy]

Thanks!!
I didn't know this trick! Is it a recent one?

All the best
Xavier

2017-03-25 19:30 GMT+11:00 Evgeni Burovski <evgeny.burovskiy at gmail.com>:

>
>
> On Sat, Mar 25, 2017 at 9:23 AM, Xavier Barthelemy <xabart at gmail.com>
> wrote:
>
>> Dear everyone,
>>
>> While we are talking about splining, I would like to add a request if
>> possible.
>> I am a heavy user of the splprep and co routines, and many times I need
>> to get the local polynomial coefficients to compute the derivatives, and
>> found the analitical zeros.
>> I had found a recipe on stackoverlord years ago, on how to get back to
>> local coefficient from the spline description.
>>
>>
>> Maybe a method, or an option, returning the local polynomial coefficients
>> (and the interval?) could be implemented?
>> it's my 2 cents as a user
>>
>>
> You can convert to piecewise polynomials via
>
> >>> tck = splrep(x, y)
> >>> p = PPoly.from_spline(tck)
>
>
>
>
>> thanks for considering it and please, discard if you think it's not fit.
>>
>> All the best
>> Xavier
>>
>> 2017-03-25 15:29 GMT+11:00 Aman Pratik <amanpratik10 at gmail.com>:
>>
>>> Seems interesting. Though adding this would require doing away with some
>>> of the other part(s) of the project. I will do some research on it.
>>> Meanwhile, lets wait for feedback from the mentors.
>>>
>>>
>>>
>>>
>>> On 25 March 2017 at 04:43, Stefan van der Walt <stefanv at berkeley.edu>
>>> wrote:
>>>
>>>> On Fri, Mar 24, 2017, at 12:19, Aman Pratik wrote:
>>>>
>>>> Hello,
>>>> This is my second Draft, Proposal : Second Draft
>>>> <https://github.com/amanp10/scipy/wiki/GSoC-2017-:-Improve-support-for-B-splines>
>>>>
>>>>
>>>> Would this be a good opportunity to add subdivision splines to SciPy?
>>>> Their implementation (at least in 1D) is simple, and they give good
>>>> locality around nodes (i.e., yield predictable curves, useful for spline
>>>> design).
>>>>
>>>> An example is given here:
>>>>
>>>> https://gist.github.com/stefanv/a28d61694fe8f3ef2325b23cbc51312a
>>>>
>>>> Stéfan
>>>>
>>>>
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>>>>
>>>
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>>
>>
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>> pour le peuple et pour chaque portion du peuple, le plus sacré des droits
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>>
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-- 
 « Quand le gouvernement viole les droits du peuple, l'insurrection est,
pour le peuple et pour chaque portion du peuple, le plus sacré des droits
et le plus indispensable des devoirs »

Déclaration des droits de l'homme et du citoyen, article 35, 1793
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