Cool - I'll have a go. Thanks,
Phil Slava Pestov wrote: > Hi Phil, > > Factor has four types of homogeneous arrays: > > - string > - byte-array > - bit-array > - float-array > > What you're proposing is subtly different -- a sequence backed by an > underlying alien object. That would be very valuable too, especially if > such sequence classes could be auto-generated for all C types one is > interested in (try doing it with parsing words!) > > Have fun, > > Slava > > Phil Dawes wrote: >> Hi Factor team, >> >> I've been using a ulong array type in my code for a while, and I noticed >> that Joel's code [1] would benefit from a float-array type. >> >> E.g. >> >> TUPLE: float-array address length ; >> >> C: <float-array> float-array >> >> M: float-array length float-array-length ; >> M: float-array nth-unsafe float-array-address float-nth ; >> M: float-array set-nth-unsafe float-array-address set-float-nth ; >> >> -------- >> >> and maybe: >> >> : with-mapped-float-array ( fname quot -- ) >> >r dup file-length r> >> [ [ mapped-file-address ] keep length 4 / <float-array> >> ] swap compose with-mapped-file ; >> >> -------- >> >> ... could make the faster version of Joel's code much cleaner: >> >> : (sum-floats) >> 0 [ clip + 2 / ] reduce ; >> >> : sum-floats >> "/tmp/floats.bin" [ (sum-floats) ] with-mapped-float-array ; >> >> >> I get the same times using this as with the faster version in Joel's >> post. Do you think it's worthwhile me adding homogeneous arrays to the >> factor library? >> >> Cheers, >> >> Phil >> >> [1] http://www.wagerlabs.com/blog/2008/01/introducing-fac.html >> >> >> >> ------------------------------------------------------------------------- >> This SF.net email is sponsored by: Microsoft >> Defy all challenges. Microsoft(R) Visual Studio 2008. >> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ >> _______________________________________________ >> Factor-talk mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/factor-talk >> >> > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2008. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > Factor-talk mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/factor-talk > ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Factor-talk mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/factor-talk
