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Mike-
If you want to, I'd be happy (later- busy this week) to mirror those on
the sourceforge site. They look quite useful, and I'll be sure to mention
those in the HOWTO (whenever I next have time for that. :|
Luis
On Tue, 14 Nov 2000, Michael J Ash wrote:
> Date: Tue, 14 Nov 2000 00:10:56 GMT
> From: Michael J Ash <mikeash@csd.uwm.edu>
> To: lugnet.robotics.rcx.legos@lugnet.com
> Subject: Fixed-point Math
>
> I'm not sure if this will make it to the list, but we'll see. I sent out a
> message twice and it still hasn't shown up.
>
> Anyway, I have uploaded my fixed-point math routines to my web site. This
> includes simple stuff like multiplication and division, but also a full
> set of trigonometry routines. Even if you'd rather use floating-point, you
> may find the technique for the trig functions valuable, since they're
> pretty fast and reasonably accurate, and wouldn't be difficult to convert
> to floating.
>
> The URLs are:
>
> http://www.mikeash.com/lego/fixedpoint.h
> http://www.mikeash.com/lego/fixedpoint.c
>
> The code is fairly well-explained in the comments (I hope!). I don't have
> any additional write-up besides them, though. If you have any questions,
> please feel free to e-mail me.
>
> I haven't done any speed tests, but I don't expect any significant speed
> differences. 32-bit integer math isn't native to the RCX CPU, and there's
> extra bitshifting work that has to be done as well, so my guess is that it
> won't be much faster than floating-point. However, it does seem to take up
> much less code space, which I personally find very valuable.
>
> Comments, suggestions, criticisms, and offers of money are all welcome. :)
>
> --
> "Say not, 'I have found the truth,' but rather, 'I have found a truth.'
> "Say not, 'I have found the path of the soul.' Say rather, 'I have met the
> soul walking upon my path.'" -- Khalil Gibran
> Mike Ash - <http://www.mikeash.com/>, <mailto:mail@mikeash.com>
>
>
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Message has 1 Reply:
 | | Re: Fixed-point Math
|
| (...) By all means go ahead. I can write up some explanation as to what they are and how they work, too, once I find time. Also, nobody seems willing/able to write anything about semaphores, so when I write that up I'll see about a little blurb on (...) (24 years ago, 16-Nov-00, to lugnet.robotics.rcx.legos)
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Message is in Reply To:
| | Fixed-point Math
|
| I'm not sure if this will make it to the list, but we'll see. I sent out a message twice and it still hasn't shown up. Anyway, I have uploaded my fixed-point math routines to my web site. This includes simple stuff like multiplication and division, (...) (24 years ago, 14-Nov-00, to lugnet.robotics.rcx.legos)
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