Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

ID 766686
Date 3/22/2024
Public

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v?Acospi

Computes the inverse cosine of vector elements divided by π.

Syntax

call vsacospi (n, a, y)

call vsacospii(n, a, inca, y, incy)

call vmsacospi (n, a, y, mode)

call vmsacospii(n, a, inca, y, incy, mode)

call vdacospi (n, a, y)

call vdacospii(n, a, inca, y, incy)

call vmdacospi (n, a, y, mode)

call vmdacospii(n, a, inca, y, incy, mode)

Include Files

  • mkl_vml.f90

Input Parameters

Name

Type

Description

n

INTEGER

Specifies the number of elements to be calculated.

a

REAL for vsacospi

REAL for vmsacospi

DOUBLE PRECISION for vdacospi

DOUBLE PRECISION for vmdacospi

Pointer to the array containing the input vector a.

inca, incy

INTEGER, INTENT(IN)

Specifies increments for the elements of a and y.

mode

INTEGER (KIND=8)

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

Output Parameters

Name

Type

Description

y

REAL for vsacospi

REAL for vmsacospi

DOUBLE PRECISION for vdacospi

DOUBLE PRECISION 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