Please see phrases d21 and d22 in http://www.jsoftware.com/jwiki/JPhrases/ParitySymmetry
----- Original Message ----- From: Tracy Harms <[EMAIL PROTECTED]> Date: Wednesday, August 15, 2007 15:33 Subject: [Jprogramming] a vector product To: [email protected] > In "Elementary Matrix Theory", Howard Eves defines a vector > product, for > three-dimensional (real) Cartesian coordinate use, so: > > c = (a2b3 - a3b2, a3b1 - a1b3, a1b2 - a2b1) > > (Above, all numerals are subscripts denoting vector elements.) > > I implemented that calculation of c with the following definitions: > > atomsb =: 1 0 { atomsa =: 3 4 A. i.3 > vp =: -/@:((atomsa { [) * atomsb { ]) > > My question is, does this seem as good a way as any to handle > this? In > particular, is this a case where it is not worth trying to shoe- > horn the > functions into a dot phrasing? ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
