Hi both, great to get such a positive response.
On 22/10/16 15:59, Gilles wrote: > Hello. > > On Sat, 22 Oct 2016 12:51:03 +0200, Eric Barnhill wrote: >> Dear Bernd, >> >> Thank you for this interesting contribution. I use these sorts of >> filters >> frequently so I will be interested to give it a look. I just build my >> Butterworths in k space so I will be interested to see how yours work >> differently. Sorry I meant I used the laguerre solver for Bessel. I'm sure we both did a similar approach for Butterworth. Either way the library is written in a way that it's very modular and you can do it the traditional way by providing analogue lowpass poles/zeroe and then the library does the rest for you or you can directly put complex conjugate pairs into a biquad cascade. Hoping that people also come up with other filter patches such as Linkwitz, for example. >> >> The math package is in flux as others can tell you, > > This is a mild description... ;-) > > To better appreciate the situation, I suggest to browse through the > "dev" ML archive (starting around last May). OK. I'll have a read! > > The bottom line is that we critically need contributors to help > maintain, and continue developing, selected packages from the > Commons Math codebase. I'd be up for it (obviously with reason). I've been teaching DSP for many years and now developing a couple of Android apps for which I need filters so that will be ongoing and happy to maintain packages and add new ones. > >> however I think such >> functionality fits the commons mission quite well and I am certainly >> happy >> to help support the code to give it a home here some how. > > It will be a good fit if the code comes with developer(s) willing > to provide support too. Yes of course I would provide support and of course see it through to the release. That comes without saying. > >> >> Best, >> Eric >> On 22 Oct 2016 01:35, "Bernd Porr" <m...@berndporr.me.uk> wrote: >> >>> Dear all, >>> >>> I've created an IIR filter library: >>> https://github.com/berndporr/iirj >>> >>> It's a re-coded version of my / Vinnie's DSP library originally written >>> in C++. I've spent quite some time to make it work with the apache >>> Complex type and I've also used the polynomial solver for the >>> Butterworth filters. >>> >>> It implements Butterworth, Elliptic, Bessel and Chebyshev Type I. The >>> library is very modular and adding new filter types is easy as adding >>> different filter topologies. >>> >>> Is there interest in fully integrating this into math commons? > > In "Commons Math" per se, no (cf. above) but as its own component, > yes. > >>> I'm aware that I don't have any maven script just now and the >>> documentation is probably not complete for apache but before I >>> embark on >>> it I'd rather ask if there is interest. > > If Eric is willing to help you, it's a good start; but you > should also be willing to stay around here long enough to > work with us towards an official release of that code. > And if, in addition, you can offer advice, and help with > other tasks, that will be really great. Sure. Def happy to stay on till the release and the ongoing maintenance. That's what I had in mind anyway. It's rather that I need you especially in terms of the build scripts which I have been avoiding for too long and need to catch up with them. > > Welcome and best regards, > Gilles Thanks! Best regards /Bernd > >>> >>> Best, >>> /Bernd Porr >>> -- >>> www: http://www.berndporr.me.uk/ >>> http://www.linux-usb-daq.co.uk/ >>> http://www.imdb.com/name/nm3293421/ >>> Mobile: +44 (0)7840 340069 >>> Work: +44 (0)141 330 5237 >>> University of Glasgow >>> School of Engineering >>> Rankine Building, Oakfield Avenue, >>> Glasgow, G12 8LT >>> > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org > For additional commands, e-mail: dev-h...@commons.apache.org > -- www: http://www.berndporr.me.uk/ http://www.linux-usb-daq.co.uk/ http://www.imdb.com/name/nm3293421/ Mobile: +44 (0)7840 340069 Work: +44 (0)141 330 5237 University of Glasgow School of Engineering Rankine Building, Oakfield Avenue, Glasgow, G12 8LT --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org For additional commands, e-mail: dev-h...@commons.apache.org
