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. -- Devon McCormick, CFA Quantitative Consultant ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
