Should the following still work? In a fresh session:
N=: 1 : '- u % u d. 1' (_2 + *:) N^:3 ]1 1.41422 JVERSION Engine: j901/j64avx/windows Beta-i: commercial/2019-08-29T09:48:23 Library: 9.01.09 Qt IDE: 1.8.3/5.12.3 Platform: Win 64 Installer: J901 install InstallPath: c:/program files/j901 Contact: www.jsoftware.com Given the release notes "*Language deletion*: calculus primitives (d. D. D:) are removed from the language" I was expecting to get an error and have to redefine N using deriv_jcalculus. On Wed, Sep 4, 2019 at 2:44 AM Henry Rich <[email protected]> wrote: > If you need the inverse to !, you can use Roger's > > 3 : '(-(!-y"_)%0.001&*!"0 D:1])^:_<.&170^:(-:+)^.y' > > replacing D: with sslope_jcalculus_ (untested). You could even fix it > up to avoid the NaN error. > > Henry Rich > > > > On 9/3/2019 10:39 AM, Don Guinn wrote: > > Well I previously reported it to beta. So here it is again. > > > > To determine the inverse of factorial uses D: . In J807 forcing a > > deliberate error give the following: > > > > ! inv 0.001 > > > > |NaN error > > > > | (-(!-y"_)%0.001&*!"0 D:1])^:_<.&170^:(-:+)^.y > > > > In the middle of the magic function is D: . > > > > JVERSION > > > > Engine: j807/j64/windows > > > > Release-d: commercial/2019-03-18T13:21:35 > > > > Library: 8.07.26 > > > > Qt IDE: 1.7.10/5.9.7 > > > > Platform: Win 64 > > > > Installer: J807 install > > > > InstallPath: c:/j64-807 > > > > Contact: www.jsoftware.com > > > > ! inv 6 > > > > 3 > > > > Works just fine in 807. But in latest beta > > > > ! inv 6 > > > > |domain error > > > > | !inv 6 > > > > JVERSION > > > > Engine: j901/j64avx/windows > > > > Beta-i: commercial/2019-08-29T09:48:23 > > > > Library: 9.01.09 > > > > Qt IDE: 1.8.3/5.12.3 > > > > Platform: Win 64 > > > > Installer: J901 install > > > > InstallPath: c:/j64-j901 > > > > Contact: www.jsoftware.com > > > > > > There is nothing about factorial inverse being dropped in the release > > notes. I don't know if the inverse of factorial should be dropped or not. > > But I have found it quite useful. > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > > --- > 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 > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
