ok well here is the problem i am havin, hopefully someone will be able to help.. r(t) = [2cos(t),3sin(t)], from this i am to find the angle between v(3*%pi/4) and a(3*%pi/4), for whatever reason i cannot get the angle. i do understand that theta = acos(v.a/(mag_v)*(mag_a)). ok i actually didnt use mag_v command. i set it up as norm, norm(a):=sqrt(a.a)$ is what i did..and its still not working out for me..any thoughts? i attached my work..maybe this weill help you see where im going wrong...
be ye steadfast, unmoveable, unshakable, always abounding in the work of the Lord.....
> From: maxima-request at math.utexas.edu
> Subject: Maxima Digest, Vol 50, Issue 54
> To: maxima at math.utexas.edu
> Date: Tue, 28 Sep 2010 05:55:09 -0500
>
> Send Maxima mailing list submissions to
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> When replying, please edit your Subject line so it is more specific
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>
> Today's Topics:
>
> 1. Re: find_root with bfloats (Raymond Toy)
> 2. Re: More documentation of Maxima internals (Raymond Toy)
> 3. Re: find_root with bfloats (Raymond Toy)
> 4. information about maxima (maurizio de sanctis)
> 5. Re: Error in nonlinear system (Andrea Bottino)
> 6. create a function (Paul.Lennon at beatles.com)
> 7. beginner trying to learn how to use maxima for calc
> applications (Alejandro Morales)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 27 Sep 2010 20:31:04 -0400
> From: Raymond Toy <toy.raymond at gmail.com>
> To: maxima at math.utexas.edu
> Subject: Re: [Maxima] find_root with bfloats
> Message-ID: <4CA13748.4000405 at gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> On 9/27/10 1:41 PM, Kostas Oikonomou wrote:
> > Ray,
> >
> > I tried using your bf_find_root, which is indeed much, much simpler
> > than what I was doing, on an example I'm working on. My use of
> > bf_find_root is embedded in a lot of maxima code, which I'm not
> > posting. bf_find_root works, but SBCL 1.0.40 produced a bunch of
> > warnings. I am attaching them in case they're useful.
> I looked at some of the warnings. The warning about *nounsflag* seems
> bogus since *nounsflag* IS a special variable on cmucl and ccl.
>
> Anyway, I'm going to ignore that for now.
>
> If you find some bug in bf_find_root, please let me know.
>
> Ray
>
>
>
> ------------------------------
>
> Message: 2
> Date: Mon, 27 Sep 2010 22:31:48 -0400
> From: Raymond Toy <toy.raymond at gmail.com>
> To: maxima at math.utexas.edu
> Subject: Re: [Maxima] More documentation of Maxima internals
> Message-ID: <4CA15394.3090203 at gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> On 9/26/10 11:29 AM, Dieter Kaiser wrote:
> > Because we do not have a technical documentation of Maxima internals, I
> > have started to write some documentations of functions I have worked on.
> > The following examples try to document the functions PLS, ADDK, EXPTA,
> > and EXPTB in simp.lisp. I have taken the Common Lisp HyperSpec as a
> > guide to document the functions.
> >
> > I am interested to add the documentations to the project. We might add
> > it to the Lisp files (the documentation might be to verbose) or we start
> > to add a technical documentation in a TEXI format.
> >
> > Opinions or suggestions?
> >
> I think this is a great idea. I would certainly like the documentation
> to be in the Lisp files. I think that's more likely to be up-to-date
> than having the documentation in some other file.
>
> Also, my personal wish-list item would be to have docstrings for the
> functions. They don't have to be as elaborate as the comments you've
> proposed, but a simplified version would be awful nice when you want to
> use the function but forget exactly what the arguments are or forget
> exactly what it does. Yes, I can look up the source code, but I'm more
> likely to remember the name of the function than the file the function
> lives in. :-)
>
> Oh, this is not saying that you, Dieter, needs to add the docstrings. I
> can do that, and I hope others can if there is nice documentation for
> the functions already.
>
> Ray
>
>
>
> ------------------------------
>
> Message: 3
> Date: Mon, 27 Sep 2010 23:43:21 -0400
> From: Raymond Toy <toy.raymond at gmail.com>
> To: Robert Dodier <robert.dodier at gmail.com>
> Cc: maxima at math.utexas.edu
> Subject: Re: [Maxima] find_root with bfloats
> Message-ID: <4CA16459.6060101 at gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> On 9/26/10 9:39 PM, Robert Dodier wrote:
> > On 9/26/10, Raymond Toy <toy.raymond at gmail.com> wrote:
> >
> >> As the author of the bigfloat package, I'm biased. But, as you can see,
> >> I barely made any changes to find-root-subr, so it does make it easier
> >> to convert existing double-float routines to handle bigfloats. The
> >> difficult parts are usually in figuring out when to convert to and from
> >> the bigfloat representation to maxima's internal bfloat representation.
> >>
> >> But here is my quick attempt at bf_find_root. I'm pretty sure there are
> >> bugs here, but the couple of examples I tried work:
> > I don't really have any preference. So if you have a working version,
> > by all means please go ahead and commit it.
>
> Ok, I think I have a unified version now. I moved the guts of
> coerce-float-fun to another function that takes another argument to
> specify whether to $float or $bfloat the answer. Same for the support
> functions. Now there's coerce-float-fun (as before), and coerce-bfloat-fun.
>
> The testsuite is working fine now with these changes, but I haven't
> tried to do the equivalent tests with bf_find_root.
>
> One issue is find_root_abs and find_root_rel. I added bf_find_root_abs
> and bf_find_root_rel. But I left find_root_error unchanged. Maybe
> there should be a bf_find_root_error too?
>
> If further testing is ok, I'll check in the changes.
>
> Ray
>
>
>
> ------------------------------
>
> Message: 4
> Date: Fri, 24 Sep 2010 19:59:46 -0500
> From: maurizio de sanctis <mrz.desanctis at gmail.com>
> To: maxima at math.utexas.edu
> Subject: information about maxima
> Message-ID:
> <AANLkTinzXkSEu1M9J1=UY7nE-3-Xkm4fyuZVZjnps3+h at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Dear Sirs,
> I have started to use Maxima and I find it very useful for my research in
> theoretical phyisics.
> I ask you if it exists a Maxima package for angular momentum algebra,
> Clebsch-Gordan coefficients and so on...
>
> Sincerely
>
> Maurizio De Sanctis
>
> Associated Professor
> Universidad Nacional de Colombia, Departamento de F?sica, Bogota' Colombia
> ex INFN Roma, Italia
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>
> ------------------------------
>
> Message: 5
> Date: Fri, 24 Sep 2010 10:31:31 +0200
> From: Andrea Bottino <andrea.bottino at polito.it>
> To: Barton Willis <willisb at unk.edu>
> Cc: maxima at math.utexas.edu
> Subject: Re: [Maxima] Error in nonlinear system
> Message-ID: <4C9C61E3.1080807 at polito.it>
> Content-Type: text/plain; charset="us-ascii"
>
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> ------------------------------
>
> Message: 6
> Date: Mon, 27 Sep 2010 13:45:38 +0200
> From: Paul.Lennon at beatles.com
> To: maxima at math.utexas.edu
> Subject: create a function
> Message-ID: <4CA083E2.3010505 at beatles.com>
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
>
> Hi,
>
> I try to contruct a function real -> function.
>
> s(o):=lambda([m],2*m-o);
>
> where o and m are liste of two reals don't work.
>
> an idee ?
>
> Thanks.
>
> PL
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>
> ------------------------------
>
> Message: 7
> Date: Sat, 25 Sep 2010 15:02:34 -0500 (CDT)
> From: Alejandro Morales <mori at ce.fis.unam.mx>
> To: maxima at math.utexas.edu
> Subject: beginner trying to learn how to use maxima for calc
> applications
> Message-ID: <Pine.LNX.4.64.1009251438020.17073 at ce.fis.unam.mx>
> Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
>
> Dear Jack:
> All maxima commands are in
> http://maxima.sourceforge.net/docs/manual/en/maxima.html
> and some tutorials in
> http://maxima.sourceforge.net/documentation.html
> Although written for macsyma, "Macsyma user' guide", second edition (1996)
> could be useful for begginers despite differences with actual Maxima.
> A. Morales. Good luck.
>
>
> ------------------------------
>
> _______________________________________________
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>
> End of Maxima Digest, Vol 50, Issue 54
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