It looks like the book is incorrect. Here's more up-to-date information on how " D. " works: http://www.jsoftware.com/help/dictionary/ddcapdot.htm .
On Fri, Jun 22, 2012 at 4:42 PM, Andrew Seary <se...@sfu.ca> wrote: > Hi there: > > I hought it was time to give J another try, so I downloaded J602 and > started following the examples in Iverson's Calculus -- I always enjoy his > expositions. > > The following has stopped me in my tracks. > From the examples in Chapter 3 (copy/paste from a J session): > ===From J session==== > lwh=:4 3 2 > vol=:*/ > vol lwh > 24 > vol D.1 lwh > 6 8 12 > VOLS=:vol\ > VOLS lwh > 4 12 24 > VOLS D.1 lwh > 1 3 6 > 0 4 8 > 0 0 12 > ======================= > > That last result is the TRANPOSE of the what is shown in the text: > > ====From Calculus Ch. 3= > > VOLS D.1 lwh > 1 0 0 > 3 4 0 > 6 8 12 > ======================== > > Showstoppper! What the heck is going on? > > Andrew Seary > se...@sfu.ca > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm -- Devon McCormick, CFA ^me^ at acm. org is my preferred e-mail ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
