Developer Reference for Intel® oneAPI Math Kernel Library for C

ID 766684
Date 12/16/2022
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.

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.