So Henry, can you imagine yourself doing FFT on a sparse hypercube, sparse because many of the entries are 0? For this application not having rank restricted to 63 or less would be nice.
On Sun, Apr 4, 2021 at 8:04 AM Roger Hui <[email protected]> wrote: > > I haven't used rank beyond 6 that I can recall, if that. > > FFT uses a high rank array, a hypercube with shape (>.2^.#x)$2 . Of > course, a rank-64 hypercube would blow current computers out of the water. > > https://code.jsoftware.com/wiki/Essays/FFT > > > > On Sun, Apr 4, 2021 at 7:55 AM 'robert therriault' via Programming < > [email protected]> wrote: > >> I haven't used rank beyond 6 that I can recall, if that. >> >> I suppose that I could get around the limit by boxing items of a higher >> rank to reduce them to lower rank and using one verb to manipulate the >> boxes and another to manipulate the dimensions within the box. >> >> What is the performance advantage to setting a boundary? >> >> >> > On Apr 4, 2021, at 07:45, bill lam <[email protected]> wrote: >> > >> > What's special about 63? Why not 128, say. >> > >> > On Sun, Apr 4, 2021, 9:52 PM Henry Rich <[email protected]> wrote: >> > >> >> I propose that the maximum value for a rank, whether of a verb or a >> >> noun, will be 63. Minimum verb rank will be _63. >> >> >> >> You got a problem with that? >> >> >> >> Henry Rich >> >> >> >> -- >> >> This email has been checked for viruses by AVG. >> >> https://www.avg.com >> >> >> >> ---------------------------------------------------------------------- >> >> For information about J forums see http://www.jsoftware.com/forums.htm >> >> >> > ---------------------------------------------------------------------- >> > For information about J forums see http://www.jsoftware.com/forums.htm >> >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm >> > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
