Subject:
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RE: NQC with C++ header file
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 25 Oct 2000 15:57:52 GMT
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Original-From:
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John Barnes <barnes@sensorsAVOIDSPAM.com>
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Viewed:
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756 times
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Absolutely! You'd be amazed at what can be done with 16 bit integer
arithmetic if you operate at some suitable scale factor, depending upon
the requirements - x10, x100, x16, x256. It depends on the ease with
which you can shift and/or divide.
As far as transcendental functions are concerned, I am still waiting for
someone far more skilled, or should I say schooled, than I to implement
sin, cos tan etc using CORDIC in nqc. That would be a truely useful
include file!
JB
> Bah! We don't need no stinkin floating point. Here are a few approximations
> to real and transcendental numbers that you can make by dividing
> signed integers - the error is gennerally less that 1 in 1,000,000
>
> pi 355 /113
> sqrt(2) 19601 / 13860
> e 28667 / 10546
> c 24559 / 8192
>
> By the way, there's a discussion on fixed point mathi in my pbForth chapters
> in the new Extreme Mindstorms book. And I think Luis has some info on
> floats using legOS
>
> Cheers,
>
> Ralph Hempel - P.Eng
>
> --------------------------------------------------------------------
> Check out pbFORTH for LEGO Mindstorms at:
> <http://www.hempeldesigngroup.com/lego/pbForth>
>
> Buy "Extreme Mindstorms: an Advanced Guide to Lego Mindstorms"
> <http://www.amazon.com/exec/obidos/ASIN/1893115844/hempeldesigngrou>
> --------------------------------------------------------------------
> Reply to: rhempel at bmts dot com
> --------------------------------------------------------------------
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Message is in Reply To:
 | | Re: NQC with C++ header file
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| (...) What specifically do you have in mind? The limitation is going to be from the firmware bytecodes...no floating point, no transcendentals, no math larger than 16 bits. Switching over to legOS would give you floating point, but still no (...) (24 years ago, 25-Oct-00, to lugnet.robotics)
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