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MathGroup Archive 1996

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implementation of cos,sin,tan,etc.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg3904] implementation of cos,sin,tan,etc.
  • From: nfogelso at ix.cs.uoregon.edu (Nicholas S Fogelson)
  • Date: Sun, 5 May 1996 23:11:51 -0400
  • Organization: University of Oregon Computer and Information Sciences Dept.
  • Sender: owner-wri-mathgroup at wolfram.com

Does anyone know exactly how MM calculates cos,sin,etc.  I know that its
not by expansion of a Taylor series because it makes the answer too
darn fast to be doing that (ie - if you went through the taylor calculation
of sin1000000 it would take quite a few seconds before it started outputting.
Just doing sin1000000 will cause instant output).

I know that the MM implementations are not public, but I thought maybe
somebody knows this anyway. 

Also - does anyone know how an HP calculator does these calculations?
Is is the same way?


--
Nicholas Fogelson
University of Oregon
Department of Computer and Information Science
nfogelso at cs.uoregon.edu  (503)683-7885

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