Subject:
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Re: basic trigonometric functions on the handyboard..
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 9 Mar 1999 21:13:46 GMT
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Original-From:
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Jeroen van der Vegt <A.J.VANDERVEGT@saynotospamITS.TUDELFT.NL>
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Viewed:
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1141 times
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The attached GIF shows the Taylor series of the arcsin and arccos.
arctan=arccos/arcsin. I haven't tried to implement these formulas on a
68HC11.
3 to 4 steps are quite precise already.
Jeroen van der Vegt.
-----Original Message-----
From: Raymond, Shelby <srr@cherry-semi.com>
To: 'SHETTI.NITIN.MANGESH' <shettin@giasbmc.vsnl.net.in>; Guy & Gad Berg
<gberg@netvision.net.il>
Cc: handyboard@media.mit.edu <handyboard@media.mit.edu>
Date: dinsdag 9 maart 1999 17:48
Subject: RE: basic trigonometric functions on the handyboard..
> Wouldn't it be easier to just use the cosine function itself?
> x = cos y
> You know x, but you want to find y.
> Pick a y (maybe 45 deg) and calculate the x.
> Use successive approximation to determine y within
> a tolerance. Almost like calculating a transcendental
> equation.
>
> -Shelby
>
> > Dear Berg,
> > You can perhaps express cos^-1 in the forms of a Taylor series and
> > use that series for finding the approximate value. I have however not
> > tried it.
> > There is no math function for inverse cosine.Refer to handy board
> > manual available el.www.mit.media.edu for details on IC.
> > Yours sincerely,
> > Nitin
> >
> > On Tue, 9 Mar 1999, Guy & Gad Berg wrote:
> >
> > > Hi.
> > > We've been trying to build an algorithm which will allow our HB to
> > > travel between given points.
> > > We need to use the inverse cosine function (cos^-1), how can we do • that?
> > > Is there a math library which contains this and other trig functions?
> > >
> > > Thanks,
> > > Guy.
> > >
> > >
>
--
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