Computes the inverse cosine of vector elements divided by π.

Syntax

vsAcospi (n, a, y);

vmsAcospi (n, a, y, mode);

vdAcospi (n, a, y);

vmdAcospi (n, a, y, 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 vsAcospi

const float* for vmsAcospi

const double* for vdAcospi

const double* for vmdAcospi

Pointer to the array containing the input vector a.

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 vsAcospi

float* for vmsAcospi

double* for vdAcospi

double* for vmdAcospi

Pointer to an array containing the output vector y.

Description

The v?Acospi function computes the inverse cosine of vector elements divided by π. For an argument x, the function computes acos(x)/π.

See Special Value Notations for the conventions used in this table:

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

See Also

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