I guess I was expecting a numerical solution if a symbolic one is not found.
On Fri, Jan 15, 2021 at 10:05 PM Henry Rich <[email protected]> wrote: > What do you expect the derivative of #.&1 _1 _2&> to be? > > I see that #.&1 _1 _2 has no derivative, but 1 _1 _2&p. does. > > Deficiencies in math/calculus are not 'issues'. They are opportunities > for improvement by users. > > Henry Rich > > On 1/15/2021 9:37 PM, Devon McCormick wrote: > > I tried to update chapter 23 of the "50 Shades of J" essay using the new > > version of Newton's method from " > > https://code.jsoftware.com/wiki/Essays/Newton%27s_Method"; but this > breaks > > examples in "50 Shades", e.g. > > > > f1=: #.&1 _1 _2&> NB. Function to use > > Newton=: adverb : ']-u % (u deriv_jcalculus_ 1' > > f1 Newton 1 > > |domain error: deriv_jcalculus_ > > | 13!:8(3) > > |deriv_jcalculus_[:19] > > > > Is this a known issue? > > > > I've left my "fix" in as the existing code will also break in the current > > version of J. > > > > > -- > This email has been checked for viruses by AVG. > https://www.avg.com > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > -- Devon McCormick, CFA Quantitative Consultant ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
