Thanks, the addon is updated now.
On Sun, Feb 7, 2021 at 6:13 AM 'Jon Hough' via Programming <[email protected]> wrote: > > Mike, thanks. I noticed I missed that out too. > > I have added fexp and merged. > > Thanks, > Jon > On Sunday, February 7, 2021, 09:19:56 PM GMT+9, 'Michael Day' via > Programming <[email protected]> wrote: > > For interest, I had a look at the changes in the script. > > I tried both derivatives, and both failed in different ways: > a) polynomials using p. : > (1 2 3 & p. ) deriv 1 NB. result should be 2 6&p. > 0&p. > (0 & p. ) deriv 1 NB. ok! > 0&p. > > b) f() ^ h() > (*: ^ *:) deriv 1 > |domain error: deriv_jcalculus_ > | 13!:8(3) > > After some puzzlement, I traced the difficulties with each: > a) line 170 > if. coeffs=. -: '' do. '0&p.' return. > should of course be > if. coeffs -: '' do. '0&p.' return. > > b) I couldn't see what was wrong until I realised that fexp is undefined! > So adding a definition along the lines of the other fops removes the > error condition. > > fexp =: 4 : 0 > '((',x,')^(',y,'))' > ) > > I wouldn't dare try altering the online source code! > > Cheers, > > Mike > > On 05/02/2021 04:34, 'Jon Hough' via Programming wrote: > > I wrote a bug report and fix in the source chat a couple of weeks ago. > > There was no response, so I guess I wrote in the wrong chat. > > > > The calculus addon script has one glaring issue, and one small issue with > > an easy fix. > > > > The glaring issue is the inability to differentiate the constant zero > > function > > > > 0&p. > > > > that gives an error. > > > > The fix is here: https://github.com/jsoftware/math_calculus/pull/2 > > > > I think this should be fixed asap, as it also causes an error on double > > differentiation of a linear polynomial. > > > > 1 2&p. > > > > The other issue is differentiating a general f^g function, which currently > > gives an error, but is easily doable. > > > > Thanks, > > Jon > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > > -- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
