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#### 1Coranac » Off on a tangent : a look at arctangent implementations

Or: everything you never wanted to know about arctangent implementations and weren't afraid to not ask.
13 years ago by @jaeschke
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#### 1arctangent for the PIC

This routine will take an 8 bit integer that corresponds to the numerator of a fraction whose denominator is 256 and find its arctangent. So the input ranges from 0 to 255 which corresponds to 0 to 255/256 = 0.996 . The output for an arctangent routine that returns a floating point number would be from 0 (atan(0)) to 0.783 (atan(255/256)) radians; or if you prefer, 0 to 44.89 degrees. However, this routine scales the output so that pi/4 radians (or 45 degrees) corresponds to 256. So for the input range of 0 to 255 you get an output of 0 to 255 ( atan(255/256) * 256 / (pi/4) is about 255). It's probably a little more interesting to see an intermediate data point or two:
13 years ago by @jaeschke
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#### 1Quick and dirty four-quadrant integer-only arctangent in Spin :: Parallax Forums

I needed a quick arctangent function using integer arithmetic, so I could convert (Δx, Δy) target locations to turn angles.
13 years ago by @jaeschke
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#### 1Arctan(x)

by polynomial approximation
13 years ago by @jaeschke
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#### 1Trigonometry demystified

McGraw-Hill "Demystified" series McGraw-Hill, Second edition edition, (2012)
10 hours ago by @glonga
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#### 1Teach Yourself Trigonometry, Revised edition

McGraw-Hill Education, Second edition, (2003)
24 hours ago by @glonga
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#### 1Effects of GeoGebra Software Package on the Mathematics Performance of Senior Secondary Students with Dyscalculia in Bayelsa State Nigeria

International Journal of Trend in Scientific Research and Development 5 (1): 1397-1401 (December 2020)
3 years ago by @ijtsrd
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#### 1Implementation of Rotation and Vectoring-Mode Reconfigurable CORDIC

International Journal of Trend in Scientific Research and Development 2 (4): 1594-1602 (June 2018)
5 years ago by @ijtsrd
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#### 1Math Bite: Sums of Sines and Cosines

Mathematics Magazine 82 (2): 126 (2009)
8 years ago by @ytyoun
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#### 1Sines and Cosines of Angles in Arithmetic Progression

Mathematics Magazine 82 (5): 371--372 (2009)
8 years ago by @ytyoun
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#### 1Trigonometric Series

Cambridge University Press, Cambridge, UK, (2003)
8 years ago by @ytyoun
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#### 1Ueber die Darstellbarkeit einer Function durch eine trigonometrische Reihe

Abhandlungen der Königlichen Gesellschaft der Wissenschaften zu Göttingen (1868)
14 years ago by @rwst
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#### 1MicrEuclide, een goniometrisch grafisch pakket

I. Ghys, and J. Paredaens. WISINF 87-05. (1987)
14 years ago by @hidders
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