Henry et al, I have 2 questions.
How would the second root at 2 be found with Skip's problem? Why do I get the following error? server:~ brian$ /Users/brian/j901/bin/jconsole ; exit; JVERSION Engine: j901/j64avx/darwin Release-c: commercial/2020-01-11T12:22:31 Library: 9.01.20 Platform: Darwin 64 Installer: J901 install InstallPath: /users/brian/j901 Contact: www.jsoftware.com load'math/calculus' Newton =: adverb : ']-u%(u deriv_jcalculus_ 1)'(^:_)("0) (^~ - +:) Newton 0.5 |domain error: deriv_jcalculus_ | 13!:8(3) Thanks, On Wed, Feb 5, 2020 at 7:34 AM Henry Rich <henryhr...@gmail.com> wrote: > I misread your function. > > (^~ - +:) Newton 1.1 > 0.346323j1.2326e_32 > (^~ - +:) Newton 0.5 > 0.346323 > > Still need those guardrails! > > Henry Rich > > -- (B=) ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm