[Numpy-discussion] (no subject)

Ralf Gommers ralf.gommers at gmail.com
Fri Jan 24 17:25:10 EST 2014

On Thu, Jan 23, 2014 at 11:58 PM, jennifer stone
<jenny.stone125 at gmail.com>wrote:

> Scipy doesn't have a function for the Laplace transform, it has only a
>> Laplace distribution in scipy.stats and a Laplace filter in scipy.ndimage.
>> An inverse Laplace transform would be very welcome I'd think - it has real
>> world applications, and there's no good implementation in any open source
>> library as far as I can tell. It's probably doable, but not the easiest
>> topic for a GSoC I think. From what I can find, the paper "Numerical
>> Transform Inversion Using Gaussian Quadrature" from den Iseger contains
>> what's considered the current state of the art algorithm. Browsing that
>> gives a reasonable idea of the difficulty of implementing `ilaplace`.
> A brief scanning through the paper "Numerical Transform Inversion Using
> Gaussian Quadrature" from den Iseger does indicate the complexity of the
> algorithm. But GSoC project or not, can't we work on it, step by step? As I
> would love to see a contender for Matlab's ilaplace on open source front!!

Yes, it would be quite nice to have. So if you're interested, by all means
give it a go. An issue for a GSoC will be how to maximize the chance of
success - typically merging smaller PRs frequently helps a lot in that
respect, but we can't merge an ilaplace implementation step by step.

> You can have a look at https://github.com/scipy/scipy/pull/2908/files for
>> ideas. Most of the things that need improving or we really think we should
>> have in Scipy are listed there. Possible topics are not restricted to that
>> list though - it's more important that you pick something you're
>> interested
>> in and have the required background and coding skills for.
> Thanks a lot for the roadmap. Of the options provided, I found the
> 'Cython'ization of Cluster great. Would it be possible to do it as the
> Summer project if I spend the month learning Cython?

There are a couple of things to consider. Your proposal should be neither
too easy nor too ambitious for one summer. Cythonizing cluster is probably
not enough for a full summer of work, especially if you can re-use some
Cython code that David WF or other people already have. So some new
functionality can be added to your proposal. The other important point is
that you need to find a mentor. Cluster is one of the smaller modules that
doesn't see a lot of development and most of the core devs may not know so
well. A good proposal may help find an interested mentor. I suggest you
start early with a draft proposal, and iterate a few times based on
feedback on this list.

You may want to have a look at your email client settings by the way, your
replies seem to start new threads.


> Regards
> Janani
>> Cheers,
>> Ralf
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