v?Cos

Developer Reference for Intel® oneAPI Math Kernel Library for C

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ID 766684

Date 3/31/2023

Version

Public

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v?Cos

Computes cosine of vector elements.

Syntax

vsCos( n, a, y );

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

vmsCos( n, a, y, mode );

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

vdCos( n, a, y );

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

vmdCos( n, a, y, mode );

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

vcCos( n, a, y );

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

vmcCos( n, a, y, mode );

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

vzCos( n, a, y );

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

vmzCos( n, a, y, mode );

vmzCosI(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 vsCos, vmsCos const double* for vdCos, vmdCos const MKL_Complex8* for vcCos, vmcCos const MKL_Complex16* for vzCos, vmzCos	Pointer to an array that contains the input vector a.
inca, incy	const MKL_INT	Specifies increments for the elements of `a` and `y`.
mode	const MKL_INT64	Overrides global VM mode setting for this function call. See vmlSetMode for possible values and their description.

Output Parameters

Name	Type	Description
y	float* for vsCos, vmsCos double* for vdCos, vmdCos MKL_Complex8* for vcCos, vmcCos MKL_Complex16* for vzCos, vmzCos	Pointer to an array that contains the output vector y.

Name

Type

Description

float* for vsCos, vmsCos

double* for vdCos, vmdCos

MKL_Complex8* for vcCos, vmcCos

MKL_Complex16* for vzCos, vmzCos

Pointer to an array that contains the output vector y.

Description

The v?Cos function computes cosine of vector elements.

Note that arguments abs(a[i]) ≤ 2¹³ and abs(a[i]) ≤ 2¹⁶ for single and double precisions respectively are called fast computational path. These are trigonometric function arguments for which VM provides the best possible performance. Avoid arguments that do not belong to the fast computational path in the VM High Accuracy (HA) and Low Accuracy (LA) functions. Alternatively, you can use VM Enhanced Performance (EP) functions that are fast on the entire function domain. However, these functions provide less accuracy.

Special Values for Real Function v?Cos(x)
Argument	Result	VM Error Status	Exception
+0	+1
-0	+1
+∞	QNAN	VML_STATUS_ERRDOM	INVALID
-∞	QNAN	VML_STATUS_ERRDOM	INVALID
QNAN	QNAN
SNAN	QNAN		INVALID

Specifications for special values of the complex functions are defined according to the following formula

Cos(z) = Cosh(i*z).

Product and Performance Information
Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex. Notice revision #20201201

Product and Performance Information

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.

Notice revision #20201201

Parent topic: Trigonometric Functions

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Developer Reference for Intel® oneAPI Math Kernel Library for C

v?Cos