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CTK Exchange
alexb
Charter Member
1650 posts |
Sep-30-05, 06:57 AM (EST) |
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1. "RE: Pocket Calculator"
In response to message #0
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I can't be 100% sure but there are
- Series,
- Series accelerators, e.g., Eitken's d2 process,
- Interpolation,
- Addition formulas,
- Finite difference formulas,
- and probably more of special tricks applicable to each of the functions.
A good place to find out is the Numerical Recipes site, which on my memory had a splendid book online. However, I just check: the book does not seem to be available online, but there is a forum to post questions. I think yours should be right to the point in their place. |
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alexb
Charter Member
1650 posts |
Oct-03-05, 12:08 PM (EST) |
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3. "RE: Pocket Calculator"
In response to message #2
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>Alexb: Many thanks for your helpful reply. Using your
>suggestions, I found that calculators apparently use an
>iterative algorithm called CORDIC to evaluate trig
>functions. You are welcome. >It only requires addition and multiplication to
>find answers. I would distinguish between an algorithm and its implementation, although in the case of CORDIC, implementation just jumps out of the algorithm. CORDIC uses addition and subtraction formulas for sine and cosine in combination with a judicious selection of angles. >Links to find explanations of CORDIC can be
>found by just typing CORDIC in a search box. Thank you.
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You may be curious to have a look at the old CTK Exchange archive.
Please do not post there.
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