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Math.atan() (Function)

The inverse tangent of the passed in value.

Availability:

ECMAScript edition - 2
JavaScript - 1.0
JScript - 1.0
Internet Explorer - 3.02
Netscape - 2.0
Netscape Enterprise Server version - 2.0
Opera - 3.0
Property/method value type:Number primitive
JavaScript syntax:-Math.atan(aValue)
Argument list:aValueSome meaningful numeric value

This function returns the arc tangent of the argument.

Special boundary conditions that affect the results are:

ArgumentResult
00
minus infinity-pi/2
NaNNaN
plus infinity+pi/2

The exact value yielded by this function may vary slightly from implementation to implementation due to differences in the underlying precision of the implementations math routines and the specific algorithm selected to evaluate this function.

The result of this method is the arc-tangent of the passed in value. The result is expressed in radians and ranges from -pi/2 to +pi/2.

See also:Math object, Math.acos(), Math.asin(), Math.atan2(), Math.cos(), Math.sin(), Math.tan(), Trigonometric function

Cross-references:

ECMA 262 edition 2 - section - 15.8.2.4

ECMA 262 edition 3 - section - 15.8.2.4

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JavaScript Programmer's Reference, Cliff Wootton
Wrox Press (www.wrox.com)

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