>From my reading of this article I don't think that it is Eugene's intention is >for these lines to be executable. He is referring to two lines that are part >of a larger program for calculating Eigenvalues previously published in >another article. They are simply there (along with his detailed explanation of >what they do) to frame the ideas discussed in the rest of article.
If you want Donald McIntyre's original code then they should be available in Vector 9, 3, January 1993. Unfortunately there doesn't seem to be an online version of this but perhaps you have a copy? > -----Original Message----- > From: [email protected] [mailto:programming- > [email protected]] On Behalf Of Devon McCormick > Sent: Saturday, 16 January 2010 10:51 > To: J-programming forum > Subject: [Jprogramming] "At Play with J" - missing fns? > > I opened my newly-received copy of "At Play With J" today to the > article on > Jacobi's method. Imagine my dismay at reading the first two lines of J > code > which I am unable to run as they depend on (at least) two definitions > not > given. In > > r=. ((cos,-sin),sin,cos) (ia R)} I > Q=. q ip |:r [ R=. r ip R ip |:r > > what are "ip" and "ia"? Am I missing something here in terms of a > reference? > > > -- > Devon McCormick, CFA > ^me^ at acm. > org is my > preferred e-mail > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
