Hi,
Sorry for coming in late ... While editing calculus.ijs, could someone
please replace ". by (0!:100) at line 102?
That allows pderiv_jcalculus_ to handle multi-line verbs (user's
functions), as suggested by Raul in
https://www.jsoftware.com/pipermail/beta/2019-October/009456.html .
Thanks,
Ben
On Mon, 8 Feb 2021 at 02:19, chris burke <cbu...@jsoftware.com> wrote:
> Thanks, the addon is updated now.
>
> On Sun, Feb 7, 2021 at 6:13 AM 'Jon Hough' via Programming
> <programm...@jsoftware.com> 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 <programm...@jsoftware.com> 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
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> >
> >
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