v?Powx

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?Powx

Computes vector a to the scalar power b.

Syntax

vsPowx( n, a, b, y );

vsPowxI(n, a, inca, b, y, incy);

vmsPowx( n, a, b, y, mode );

vmsPowxI(n, a, inca, b, y, incy, mode);

vdPowx( n, a, b, y );

vdPowxI(n, a, inca, b, y, incy);

vmdPowx( n, a, b, y, mode );

vmdPowxI(n, a, inca, b, y, incy, mode);

vcPowx( n, a, b, y );

vcPowxI(n, a, inca, b, y, incy);

vmcPowx( n, a, b, y, mode );

vmcPowxI(n, a, inca, b, y, incy, mode);

vzPowx( n, a, b, y );

vzPowxI(n, a, inca, b, y, incy);

vmzPowx( n, a, b, y, mode );

vmzPowxI(n, a, inca, b, y, incy, mode);

Include Files

mkl.h

Input Parameters

Name	Type	Description
n	const MKL_INT	Number of elements to be calculated.
a	const float* for vsPowx, vmsPowx const double* for vdPowx, vmdPowx const MKL_Complex8* for vcPowx, vmcPowx const MKL_Complex16* for vzPowx, vmzPowx	Pointer to an array that contains the input vector a.
b	const float for vsPowx, vmsPowx const double for vdPowx, vmdPowx const MKL_Complex8 for vcPowx, vmcPowx const MKL_Complex16 for vzPowx, vmzPowx	Constant value for power b.
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.

Precision Overflow Thresholds for Real v?Powx Function
Data Type	Threshold Limitations on Input Parameters
single precision	`abs(a[i]) < ( FLT_MAX )^1/b`
double precision	`abs(a[i]) < ( DBL_MAX )^1/b`

Precision overflow thresholds for the complex v?Powx function are beyond the scope of this document.

Output Parameters

Name	Type	Description
y	float* for vsPowx, vmsPowx double* for vdPowx, vmdPowx MKL_Complex8* for vcPowx, vmcPowx MKL_Complex16* for vzPowx, vmzPowx	Pointer to an array that contains the output vector y.

Name

Type

Description

float* for vsPowx, vmsPowx

double* for vdPowx, vmdPowx

MKL_Complex8* for vcPowx, vmcPowx

MKL_Complex16* for vzPowx, vmzPowx

Pointer to an array that contains the output vector y.

Description

The v?Powx function computes a to the power b for a vector a and a scalar b.

The real function v(s/d)Powx has certain limitations on the input range of a and b parameters. Specifically, if a[i] is positive, then b may be arbitrary. For negative a[i], the value of b must be an integer (either positive or negative).

The complex function v(c/z)Powx has no input range limitations.

Special values and VM Error Status treatment are the same as for the v?Pow function.

Parent topic: Power and Root Functions

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Developer Reference for Intel® oneAPI Math Kernel Library for C

v?Powx