In J807: (i.0) p. 2 0
In the current j904 beta: (i.0) p. 2 |domain error, executing dyad p. |polynomial may not be empty | (i.0) p.2 I think this change should be reverted. I have not researched the full history of this change, but J polynomials may be padded with an arbitrary number of trailing zeros without changing their significance. So, mathematically speaking, empty polynomials should be within the domain of the p. verb. But, also, this breaks typical general case implementation of a derivative operation on polynomials. In other words, this worked fine under j807: pderiv=: 1 }. (* i.@#) (pderiv 5) p. 2 0 Thanks, -- Raul ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
