On Tuesday 17 December 2013 00:18:09 dave did opine: > On Mon, 2013-12-16 at 19:25 +0000, andy pugh wrote: > > On 16 December 2013 19:05, Gene Heskett <ghesk...@wdtv.com> wrote: > > > This "jerk" you are discussing seems like the ideal place to have a > > > module similar in nature to one of the limit functions, and which > > > would subject a step change in speed to what I would call in a > > > broadcast waveform analyzing situation as a "sine-squared" > > > function. > > > > Unfortunately it isn't quite that simple, as the motion planner needs > > to be able to put the controlled point at the right place at the > > right time. > > > > For the infinite-jerk case the motion planner has to solve the > > equation s = ut + 1/2 at^2 > > For the finite-jerk case the equation is s = ut + 1/2 at^2 + 1/6 jt^3. > > I suspect that harder is equivalent to slower and probably for 9 space > MUCH slower. > > However, this is one solution and has been around awhile. > > www.sites.mech.ubc.ca/~caris/Publications/sonja.pdfâ€ژ > > Dave
That looks what I was going on about. The waveforms are precisely what I meant. I assume this is computationally intensive? Seems to me like weighted shift registers could get us there too, using stepwise approximations with 10% of the data shuffling. OTOH I don't think its going to be easy to carve it up and paint it in a .hal file either. Suitably scaled, byte wide integers could do it nicely, and that should be plenty fast. Food for thought when I'm bored... > > The equation becomes cubic in time, and somewhat harder to solve. > > Things are (naturally) harder still in 9-space. > > ------------------------------------------------------------------------ > ------ Rapidly troubleshoot problems before they affect your business. > Most IT organizations don't have a clear picture of how application > performance affects their revenue. With AppDynamics, you get 100% > visibility into your Java,.NET, & PHP application. Start your 15-day > FREE TRIAL of AppDynamics Pro! > http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.cl > ktrk _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> We are all so much together and yet we are all dying of loneliness. -- A. Schweitzer A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. ------------------------------------------------------------------------------ Rapidly troubleshoot problems before they affect your business. Most IT organizations don't have a clear picture of how application performance affects their revenue. With AppDynamics, you get 100% visibility into your Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users