atan, atan2, atanh, atanpi, atan2pi

Tangent functions.

gentype atan ( gentype y_over_x)
gentype atan2 ( gentype y,
  gentype x)
gentype atanh ( gentype )
gentype atanpi ( gentype x)
gentype atan2pi ( gentype y,
  gentype x)


atan is the arc tangent function.

atan2 is the arc tangent of y / x.

atanh is the hyperbolic arc tangent function.

atanpi computes atan (x) / pi.

atan2pi computes atan2 (y, x) / pi.


The vector versions of the math functions operate component-wise. The description is per-component.

The built-in math functions are not affected by the prevailing rounding mode in the calling environment, and always return the same value as they would if called with the round to nearest even rounding mode.

These built-in math functions take scalar or vector arguments. The generic type name gentype is used to indicate that the function can take float, float2, float4, float8, or float16 as the type for the arguments. For any specific use of these function, the actual type has to be the same for all arguments and the return type.

If extended with cl_khr_fp64, generic type name gentype may indicate double and double{2|4|8|16} as arguments and return values. If extended with cl_khr_fp16, generic type name gentype may indicate half and half{2|4|8|16} as arguments and return values.


OpenCL Specification

Also see

Math Functions

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