"fast" in the gf package faster than "fib"

On the other hand graphics on TV are usually not scientifically accurate, maybe it is worth doing anyway.  I don't know.


 ------------Original Message------------
From: "Richard Hennessy"<rvh2007 at comcast.net>
To: "Maxima List" <maxima at math.utexas.edu>
Date: Wed, Jul-9-2008 10:39 PM
Subject: Re: [Maxima] "fastfib" in the gf package faster than "fib"

Maybe I should just watch the Science channel more.  They have great graphics of all kinds of stuff.  I could not do better than them.

As Gilda Radnor used to say, "never mind".  I can think of more student like fun stuff to do on my PC.

Rich
 


 ------------Original Message------------
From: "Richard Hennessy"<rvh2007 at comcast.net>
To: "Maxima List" <maxima at math.utexas.edu>
Date: Wed, Jul-9-2008 9:35 PM
Subject: Re: [Maxima] "fastfib" in the gf package faster than "fib"

The virtual PC's at Amazon might work for this.  I could assign 8 virtual PC's for each frame of the movie clip, one for each octant.  Maybe it is possible, I didn't think of that before.  I have mastered all the math needed.  






 ------------Original Message------------
From: "Richard Hennessy"<rvh2007 at comcast.net>
To: "Maxima List" <maxima at math.utexas.edu>, "Michel Talon" <talon at lpthe.jussieu.fr>
Date: Wed, Jul-9-2008 9:06 PM
Subject: Re: [Maxima] "fastfib" in the gf package faster than "fib"

In other words I want to watch the hydrogen atoms electron cloud change shape, so the output would be a movie clip maybe using draw(terminal=animated_gif, etc...


Rich




 ------------Original Message------------
From: "Richard Hennessy"<rvh2007 at comcast.net>
To: "Maxima List" <maxima at math.utexas.edu>, "Michel Talon" <talon at lpthe.jussieu.fr>
Date: Wed, Jul-9-2008 8:55 PM
Subject: Re: [Maxima] "fastfib" in the gf package faster than "fib"

One of the things I would like to do is specify the initial size and shape of a hydrogen atom's electron cloud in terms of some simple formula.  Then I want to compute the weights of each eigenfunction and use the time dependent Shrodinger equation to predict the time evolution of this particular initial state.  I think any physicists reading know what I mean.  But these kind of calculations are so complex that it just can't be done in a reasonable amount of time on my PC.  Maybe if I had a cluster of mainframes at my disposal, but I sadly do not.

Rich





 ------------Original Message------------
From: Michel Talon <talon at lpthe.jussieu.fr>
To: maxima at math.utexas.edu
Date: Wed, Jul-9-2008 6:04 PM
Subject: Re: [Maxima] "fastfib" in the gf package faster than "fib"

Stavros Macrakis wrote:

> If all you want is two processors, you can certainly run a two
> separate Maxima processes on your local machine.  I was suggesting
> that you might want to think about the general case.  But then, I'm
> still not clear what you're trying to accomplish.
> 
> By the way, if you're doing *floating-point* calculations, probably
> the most cost-effective platform (FLOPS per dollar) right now is
> graphics accelerator cards (!), and there are people working on real
> physics using them.  Not something I see Maxima using any time soon,
> though.
>

We have bought one in our lab. However one must be aware that one needs
to do a lot of programming to send the computations to the nVidia board
or use modified programs such as Matlab which know how to use it. 
Using Matlab means losing a lot of speed. And finally if i remember well,
the board does only single precision floating point, which for my needs is
next to useless. In many cases of interest the computation involves
quantities differing by several orders of magnitude, and having a lot
of precision is the only way to get significative answers at the end. For
example i have to diagonalize 100x100 matrices, and i need to keep around
100 decimals to get correct answers. I do that using symbolic computations
programs, e.g. mathematica. If more speed was necessary, i would use
e.g. Gnu GMP. I see a very fast single-precision board useful mainly for
statistical mechanics computations, Monte-Carlo or similar stuff.


-- 
Michel Talon
_______________________________________________
Maxima mailing list
Maxima at math.utexas.edu
http://www.math.utexas.edu/mailman/listinfo/maxima


_______________________________________________
Maxima mailing list
Maxima at math.utexas.edu
http://www.math.utexas.edu/mailman/listinfo/maxima


_______________________________________________
Maxima mailing list
Maxima at math.utexas.edu
http://www.math.utexas.edu/mailman/listinfo/maxima


_______________________________________________
Maxima mailing list
Maxima at math.utexas.edu
http://www.math.utexas.edu/mailman/listinfo/maxima


_______________________________________________
Maxima mailing list
Maxima at math.utexas.edu
http://www.math.utexas.edu/mailman/listinfo/maxima