v?Powx

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

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ID 766686

Date 4/28/2026

Version

Public

v?Powx

vsPowx vdPowx vcPowx vzPowx vmsPowx vmdPowx vmcPowx vmzPowx 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`		Number of elements to be calculated.
`a`	Fortran 77: DOUBLE PRECISION for `vdpowx` , `vmdpowx`Fortran 77: COMPLEX for `vcpowx` , `vmcpowx`Fortran 77: DOUBLE COMPLEX for `vzpowx` , `vmzpowx`Fortran 90: REAL , INTENT(IN) for `vspowx` , `vmspowx`Fortran 90: DOUBLE PRECISION , INTENT(IN) for `vdpowx` , `vmdpowx`Fortran 90: COMPLEX , INTENT(IN) for `vcpowx` , `vmcpowx`Fortran 90: DOUBLE COMPLEX , INTENT(IN) for `vzpowx` , `vmzpowx`	Array `a` that specifies the input vector
`b`	Fortran 77: DOUBLE PRECISION for `vdpowx` , `vmdpowx`Fortran 77: COMPLEX for `vcpowx` , `vmcpowx`Fortran 77: DOUBLE COMPLEX for `vzpowx` , `vmzpowx`Fortran 90: REAL , INTENT(IN) for `vspowx` , `vmspowx`Fortran 90: DOUBLE PRECISION , INTENT(IN) for `vdpowx` , `vmdpowx`Fortran 90: COMPLEX , INTENT(IN) for `vcpowx` , `vmcpowx`Fortran 90: 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`		Overrides global VM mode setting for this function call. See vmlSetMode (Sets a new mode for VM functions according to the mode parameter and stores the previous VM mode to oldmode.) 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`	Fortran 77: DOUBLE PRECISION for `vdpowx` , `vmdpowx`Fortran 77: COMPLEX for `vcpowx` , `vmcpowx`Fortran 77: DOUBLE COMPLEX for `vzpowx` , `vmzpowx`Fortran 90: REAL , INTENT(OUT) for `vspowx` , `vmspowx`Fortran 90: DOUBLE PRECISION , INTENT(OUT) for `vdpowx` , `vmdpowx`Fortran 90: COMPLEX , INTENT(OUT) for `vcpowx` , `vmcpowx`Fortran 90: 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.

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Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

v?Powx

Syntax

Include Files

Input Parameters

Output Parameters

Description