Developer Reference for Intel® oneAPI Math Kernel Library for C

ID 766684
Date 3/31/2023
Public

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v?Atanpi

Computes the inverse tangent of vector elements divided by π.

Syntax

vsAtanpi (n, a, y);

vsAtanpiI(n, a, inca, y, incy);

vmsAtanpi (n, a, y, mode);

vmsAtanpiI(n, a, inca, y, incy, mode);

vdAtanpi (n, a, y);

vdAtanpiI(n, a, inca, y, incy);

vmdAtanpi (n, a, y, mode);

vmdAtanpiI(n, a, inca, y, incy, mode);

Include Files
  • mkl.h
Input Parameters

Name

Type

Description

n

const MKL_INT

Specifies the number of elements to be calculated.

a

const float* for vsAtanpi

const float* for vmsAtanpi

const double* for vdAtanpi

const double* for vmdAtanpi

Pointer to the array containing the input vector a.

inca, incy

const MKL_INT

Specifies increments for the elements of a and y.

mode

const MKL_INT64

Overrides the global VM mode setting for this function call. See vmlSetMode for possible values and their description.

Output Parameters

Name

Type

Description

y

float* for vsAtanpi

float* for vmsAtanpi

double* for vdAtanpi

double* for vmdAtanpi

Pointer to an array containing the output vector y.

Description

The v?Atanpi function computes the inverse tangent of vector elements divided by π. For an argument x, the function computes atan(x)/π.

Special values for Real Function v?Atanpi(x)
Argument Result VM Error Status Exception
+0 +0    
-0 -0    
+ +1/2    
- -1/2    
QNAN QNAN    
SNAN QNAN   INVALID

See Also