ATAN2

• Source: https://www.freebasic.net/wiki/wikka.php?wakka=KeyPgAtan2
• Last revised: 2018-04-16

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Returns the arctangent of a ratio

Syntax

` declare function ATan2 ( byval y as double, byval x as double ) as double

`

Usage

` result = ATan2( y, x )

`

Parameters

y

Vertical component of the ratio.

x

Horizontal component of the ratio.

Return Value

The angle whose tangent is y/x, in radians, in the range [-Pi..Pi].

Description

ATan2 returns the arctangent of the ratio y/x as a Double within the range of -Pi to Pi. The arctangent is the inverse of the Tan function. The returned angle is measured in radians (not degrees).

ATan2 cannot be overloaded as operator to accept user-defined types.

Examples

start GeSHi

Print Atan2 ( 4, 5 )     'this is the same as PRINT ATN ( 4 / 5 )

end GeSHi

The output would be:

0.6747409422235527

Differences from QB

• New to FreeBASIC

Dialect Differences

• Not available in the -lang qb dialect unless referenced with the alias __Atan2.

See also

• Tan
• Atn
• A Brief Introduction To Trigonometry

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