I'll try to keep an eye on http://www.jsoftware.com/jwiki/Community/Conference2014
I'll try to attend this year. I might even be able to come up with something worth presenting. We'll see... Thanks again, -- Raul On Fri, Dec 27, 2013 at 10:53 AM, John Baker <[email protected]> wrote: > Raul, > > I believe that Eric's JD does exactly what you suggest. dbi.ijs was written > more for comphrehension and compatibility with old APL code than > performance but I was pleased by how effective it was. Organizing database > tables by columns just works. > > Have a great new year. I'll be looking forward to seeing you in Toronto at > the next J conference this summer. > > John > > > On Fri, Dec 27, 2013 at 8:45 AM, Raul Miller <[email protected]> wrote: > >> Nice! >> >> That said,here are some untested ideas for alternative implementations. >> >> First, 1!:1 and 1!:2 are nicely modular, but if you want high >> performance the apl shared variable concept (visible in J's mapped >> files) can give you higher performance. For an "inverted file" (or >> "table implemented as a named list of columns), it would be tempting >> to implement this as: >> >> A top level structural file, defining the columns, and one file for >> each column (all using the same name prefix, to slightly reduce the >> tedium of potential manual recovery work). >> >> You lose slightly with the overhead of opening those files, but if >> speed matters and you have a lot of data you gain from not having to >> read whichever columns are currently irrelevant. >> >> That said, there are a variety of other optimization techniques you >> can apply to this kind of system when you run into performance issues. >> >> Thanks, >> >> -- >> Raul >> >> On Thu, Dec 26, 2013 at 11:15 PM, John Baker <[email protected]> wrote: >> > I've put up some more goodies in jacks. dbi.ijs is a simple inverted file >> > system that can be shared with companion APL and C# systems. >> > >> > >> http://bakerjd99.wordpress.com/2013/12/26/apl-software-archaeology-dbi-edition/ >> > >> > Check out the APL character Christmas tree - latex generated. >> > >> > >> > On Mon, Dec 23, 2013 at 1:29 PM, John Baker <[email protected]> wrote: >> > >> >> Jurkey - a cross of J and turkey yielding something like jerky. I like >> it. >> >> Cheers >> >> >> >> >> >> On Mon, Dec 23, 2013 at 8:56 AM, Y-01 <[email protected]> wrote: >> >> >> >>> John, thanks for your J-turkey for Christmas. >> >>> >> >>> >> >>> On Sat, Dec 21, 2013 at 11:54 PM, John Baker <[email protected]> >> wrote: >> >>> >> >>> > I have set up a GitHub repo that consolidates all the J code >> referenced >> >>> on >> >>> > ADND. For more check: >> >>> > >> >>> > http://bakerjd99.wordpress.com/2013/12/21/jacks-repository/ >> >>> > >> >>> > Merry Christmas worldwide J'ugglers. You guys/gals consistently >> produce >> >>> the >> >>> > most interesting email in my inboxes. >> >>> > >> >>> > -- >> >>> > John D. Baker >> >>> > [email protected] >> >>> > >> ---------------------------------------------------------------------- >> >>> > For information about J forums see >> http://www.jsoftware.com/forums.htm >> >>> > >> >>> ---------------------------------------------------------------------- >> >>> For information about J forums see http://www.jsoftware.com/forums.htm >> >>> >> >> >> >> >> >> >> >> -- >> >> John D. Baker >> >> [email protected] >> >> >> > >> > >> > >> > -- >> > John D. Baker >> > [email protected] >> > ---------------------------------------------------------------------- >> > For information about J forums see http://www.jsoftware.com/forums.htm >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm >> > > > > -- > John D. Baker > [email protected] > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
