Re: Math function: ATAN2

Subject: Re: Math function: ATAN2
From: Richard Mateosian <srm -at- C2 -dot- ORG>
Date: Thu, 27 Jun 1996 11:20:57 -0700

The arctangent is a standard mathematical function. Arctan(v), roughly, is
the angle whose tangent has the value v.

ATAN2 is a function available in a number of language environments -- BASIC,
Excel functions, etc -- is a two-argument version of the arctangent.

ATAN2(x,y), again roughly, is the angle from the x-axis, moving
counterclockwise, to the line from (0,0) to (x,y).

Since the tangent of an angle is the ratio of opposite side to adjacent side
(remember sohcahtoa), ATAN2(x,y) = arctan(y/x). ...RM

Richard Mateosian Freelance Technical Writer
srm -at- c2 -dot- org Copyright 1996 Review Editor, IEEE Micro All rights reserved President, Berkeley STC

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