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
> > _______________________________________________
> > Maxima mailing list
> > Maxima@www.math.utexas.edu
> > http://www.math.utexas.edu/mailman/listinfo/maxima
>
>
--
Camm Maguire camm@enhanced.com
==========================================================================
"The earth is but one country, and mankind its citizens." -- Baha'u'llah