Name

atan — return the arc-tangent of the parameters

Declaration

genType atan(genType y, genType x);

genType atan(genType y_over_x);

Parameters

y

Specify the numerator of the fraction whose arctangent to return.

x

Specify the denominator of the fraction whose arctangent to return.

y_over_x

Specify the fraction whose arctangent to return.

Description

atan returns the angle whose trigonometric arctangent is y x or y_over_x, depending on which overload is invoked. In the first overload, the signs of y and x are used to determine the quadrant that the angle lies in. The values returned by atan in this case are in the range . Results are undefined if x is zero.

For the second overload, atan returns the angle whose tangent is y_over_x. Values returned in this case are in the range 2 2 .

Version Support

FunctionVersion 1.10Version 1.20Version 1.30Version 1.40Version 1.50Version 3.30Version 4.00Version 4.10Version 4.20Version 4.30
atanYYYYYYYYYY

See Also

sin, cos, tan

Copyright

Copyright © 2011 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/.