v?Powx

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

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ID 766686

Date 3/31/2023

Version

Public

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v?Powx

Computes vector a to the scalar power b.

Syntax

call vspowx( n, a, b, y )

call vspowxi(n, a, inca, b, y, incy)

call vmspowx( n, a, b, y, mode )

call vmspowxi(n, a, inca, b, y, incy, mode)

call vdpowx( n, a, b, y )

call vdpowxi(n, a, inca, b, y, incy)

call vmdpowx( n, a, b, y, mode )

call vmdpowxi(n, a, inca, b, y, incy, mode)

call vcpowx( n, a, b, y )

call vcpowxi(n, a, inca, b, y, incy)

call vmcpowx( n, a, b, y, mode )

call vmcpowxi(n, a, inca, b, y, incy, mode)

call vzpowx( n, a, b, y )

call vzpowxi(n, a, inca, b, y, incy)

call vmzpowx( n, a, b, y, mode )

call vmzpowxi(n, a, inca, b, y, incy, mode)

Include Files

mkl_vml.f90

Input Parameters

Name	Type	Description
n	INTEGER, INTENT(IN)	Number of elements to be calculated.
a	DOUBLE PRECISION for vdpowx, vmdpowx COMPLEX for vcpowx, vmcpowx DOUBLE COMPLEX for vzpowx, vmzpowx REAL, INTENT(IN) for vspowx, vmspowx DOUBLE PRECISION, INTENT(IN) for vdpowx, vmdpowx COMPLEX, INTENT(IN) for vcpowx, vmcpowx DOUBLE COMPLEX, INTENT(IN) for vzpowx, vmzpowx	Array `a` that specifies the input vector
b	DOUBLE PRECISION for vdpowx, vmdpowx COMPLEX for vcpowx, vmcpowx DOUBLE COMPLEX for vzpowx, vmzpowx REAL, INTENT(IN) for vspowx, vmspowx DOUBLE PRECISION, INTENT(IN) for vdpowx, vmdpowx COMPLEX, INTENT(IN) for vcpowx, vmcpowx DOUBLE COMPLEX, INTENT(IN) for vzpowx, vmzpowx	Scalar value `b` that is the constant power.
inca, incy	INTEGER, INTENT(IN)	Specifies increments for the elements of `a` and `y`.
mode	INTEGER(KIND=8), INTENT(IN)	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	DOUBLE PRECISION for vdpowx, vmdpowx COMPLEX for vcpowx, vmcpowx DOUBLE COMPLEX for vzpowx, vmzpowx REAL, INTENT(OUT) for vspowx, vmspowx DOUBLE PRECISION, INTENT(OUT) for vdpowx, vmdpowx COMPLEX, INTENT(OUT) for vcpowx, vmcpowx DOUBLE COMPLEX, INTENT(OUT) for vzpowx, vmzpowx	Array that specifies the output vector y.

Name

Type

Description

DOUBLE PRECISION for vdpowx, vmdpowx

COMPLEX for vcpowx, vmcpowx

DOUBLE COMPLEX for vzpowx, vmzpowx

REAL, INTENT(OUT) for vspowx, vmspowx

DOUBLE PRECISION, INTENT(OUT) for vdpowx, vmdpowx

COMPLEX, INTENT(OUT) for vcpowx, vmcpowx

DOUBLE COMPLEX, INTENT(OUT) for vzpowx, vmzpowx

Array that specifies 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 Fortran

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