Yes Luca, a glance back at Keith Smillie's original article shows the intention is to use "Wind" there -- which Eugene shortens to Wd -- and not some new word W.
It's wrong in http://www.jsoftware.com/jwiki/Doc/Articles/Play132 too. Most embarrassing. I wondered how it got past my rigorous testing process. But the affected verb Sp is nowhere used or run in the Volutes chapter. So all the code examples tested out although W was undefined. Keep those errata rolling in :) Ian On Wed, Dec 23, 2009 at 4:51 AM, miridian <[email protected]> wrote: > Hi, > > in the Volute article at page 88 there is, I suppose, a small error > QT=: [ ,"2 |.@|:@] > Wd=: [`(((#...@[{.]) QT [) Wd #...@[}.])@.(0:<#...@]) > Sp=: (i. @ ((-/ @ ]) , 0:)) W i.@(*/)@] > evKS=: (i.@(0:,0:)) Wd i...@*:@] > > The verb Sp is calling an undefined W > > I think it should be > Sp=: (i. @ ((-/ @ ]) , 0:)) Wd i.@(*/)@] > > MfG > > Luca > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
