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ATAN(3clc) | OpenCL Manual | ATAN(3clc) |

# NAME¶

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*

**);**

# DESCRIPTION¶

**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*) / π.

**atan2pi**computes

**atan2**(

*y*,

*x*) / π.

# NOTES¶

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. The built-in math functions take scalar or vector arguments. For any specific use of these function, the actual type has to be the same for all arguments and the return type unless otherwise specified. The generic type name**gentype**is used to indicate that the function can take

**float**,

**float2**,

**float3**,

**float4**,

**float8**,

**float16**,

**double**,

**double2**,

**double3**,

**double4**,

**double8**, or

**double16**as the type for the arguments. If extended with

**cl_khr_fp16**(3clc), generic type name

**gentype**may indicate

**half**and

**half{2|3|4|8|16}**as arguments and return values. The generic type name

**gentypef**is used to indicate that the function can take

**float**,

**float2**,

**float3**,

**float4**,

**float8**, or

**float16**as the type for the arguments. The generic type name

**gentyped**is used to indicate that the function can take

**double**,

**double2**,

**double3**,

**double4**,

**double8**, or

**double16**as the type for the arguments.

# SPECIFICATION¶

**OpenCL Specification**[1]

# SEE ALSO¶

**mathFunctions**(3clc)

# AUTHORS¶

**The Khronos Group**

# COPYRIGHT¶

Copyright © 2007-2011 The Khronos Group Inc.# NOTES¶

- 1.
- OpenCL Specification

page 244, section 6.12.2 - Math Functions

06/18/2014 | The Khronos Group |