Hi - I still haven't figured out myself how to plot discrete data points
with Maxima, which I think is what you're trying to do. The problem lies
with the plotting, not Newton. Sorry... Dave Holmgren
> -----Original Message-----
> From: Camm Maguire [SMTP:camm at enhanced]
> Sent: Tuesday, July 17, 2001 2:03 PM
> To: David Holmgren
> Cc: 'maxima@www.ma.utexas.edu'
> Subject: Re: [Maxima] Numerical routines in maxima
>
> Greetings, and thanks so much for your helpful reply! Now do you know
> how to get something like this to work?
>
> z(c):=NEWTON(%E^d-d-c,d,1.0,0.01);
> plot2d(z(c),[c,1.2,2.3]);
>
>
> I get the following error:
>
> MACSYMA was unable to evaluate the predicate:
> ABS(c - 1.718281828459045) < 0.01
> #0: NEWTON(exp=%E^d-d-c,var=d,x0=1.0,eps=0.01)
> #1: zz(c=c)
> #2: z(c=1.5)
> -- an error. Quitting. To debug this try DEBUGMODE(TRUE);)
> (C242)
>
> David Holmgren <DavidHolmgren@smarttech.com> writes:
>
> > Hi Camm,
> >
> > Certainly! At the beginning of a session, type numer:true - this will
> let
> > you do nearly everything in floating point. There is a routine in the
> share
> > directory for Newton's method for your nonlinear equation. I've done a
> few
> > numerical routines by essentially transcribing published Fortran or C
> codes.
>
> I've a little library built up myself. Have you interfaced into
> maxima? If so, how?
>
> Many thanks!
>
> >
> > Dave Holmgren
> >
> > Dr. David E. Holmgren,
> > Imaging Scientitst,
> > SMART Technologies, Inc.
> > Calgary, AB, Canada
> > http://www.smarttech.com
> > [403]-235-1452, ext. 251
> > DavidHolmgren@smarttech.com
> >
> > > -----Original Message-----
> > > From: Camm Maguire [SMTP:camm at enhanced]
> > > Sent: Monday, July 16, 2001 6:48 PM
> > > To: maxima@www.ma.utexas.edu
> > > Subject: [Maxima] Numerical routines in maxima
> > >
> > >
> > > Greetings! I've been looking at a number of the numerical routines
> > > listed by the info pages as accessible under maxima, but I can't get
> > > any of them to work. Like zsolve, for example. Are these routines
> > > still available?
> > >
> > > If not, is there any other convenient way to numerically, rather than
> > > symbolically, process a given stage of a maxima session? Can one for
> > > example approximate the root of d=%E^d-1.5?
> > >
> > > Is there any interest in providing some numerical functions, say from
> > > the gsl library, under maxima? If so, is there a howto or simple
> > > example? I could probably add what I need.
> > >
> > > Take care,
> > >
> > > --
> > > Camm Maguire
> camm@enhanced.com
> > >
> ==========================================================================
> > > "The earth is but one country, and mankind its citizens." --
> Baha'u'llah
> > > _______________________________________________
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> >
> >
>
> --
> Camm Maguire camm@enhanced.com
> ==========================================================================
> "The earth is but one country, and mankind its citizens." -- Baha'u'llah