v?Powr

Developer Reference for Intel® oneAPI Math Kernel Library for C

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ID 766684

Date 12/16/2022

Version

Public

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v?Powr

Computes a to the power b for elements of two vectors, where the elements of vector argument a are all non-negative.

Syntax

vsPowr (n, a, b, y);

vsPowrI(n, a, inca, b, incb, y, incy);

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

vmsPowrI(n, a, inca, b, incb, y, incy, mode);

vdPowr (n, a, b, y);

vdPowrI(n, a, inca, b, incb, y, incy);

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

vmdPowrI(n, a, inca, b, incb, 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, b`	const float* for vsPowr const float* for vmsPowr const double* for vdPowr const double* for vmdPowr	Pointers to arrays containing the input vectors `a` and `b`.
inca, incb, incy	const MKL_INT	Specifies increments for the elements of `a`, `b`, and `y`.
`mode`	const MKL_INT64	Overrides the global VM mode setting for this function call. See vmlSetMode for possible values and their description.

Output Parameters

Name	Type	Description
`y`	float* for vsPowr float* for vmsPowr double* for vdPowr double* for vmdPowr	Pointer to an array containing the output vector `y`.

Name

Type

Description

y

float* for vsPowr

float* for vmsPowr

double* for vdPowr

double* for vmdPowr

Pointer to an array containing the output vector y.

Description

The v?Powr function raises each element of vector a by the corresponding element of vector b. The elements of a are all nonnegative (a_i≥ 0).

Precision Overflow Thresholds for Real Function v?Powr
Data Type	Threshold Limitations on Input Parameters
single precision	`a`_i < (FLT_MAX)^1/b_i
double precision	`a`_i < (DBL_MAX)^1/b_i

Special values and VM Error Status treatment for v?Powr function are the same as for v?Pow, unless otherwise indicated in this table:

Special values for Real Function v?Powr(x)
Argument 1	Argument 2	Result	VM Error Status	Exception
`x` < 0	any value `y`	NAN	VML_STATUS_ERRDOM	INVALID
0 < `x` < ∞	±0	1
±0	-∞ < `y` < 0	+∞
±0	-∞	+∞
±0	`y` > 0	+0
1	-∞ < `y` < ∞	1
±0	±0	NAN
+∞	±0	NAN
1	+∞	NAN
`x`≥ 0	NAN	NAN
NAN	any value `y`	NAN
0 < `x` <1	-∞	+∞
`x` > 1	-∞	+0
0 ≤`x` < 1	+∞	+0
`x` > 1	+∞	+∞
+∞	`x` < +0	+0
+∞	`x` > +0	+∞
QNAN	QNAN	QNAN	VML_STATUS_ERRDOM
QNAN	SNAN	QNAN	VML_STATUS_ERRDOM	INVALID
SNAN	QNAN	QNAN	VML_STATUS_ERRDOM	INVALID
SNAN	SNAN	QNAN	VML_STATUS_ERRDOM	INVALID

Parent topic: Power and Root Functions

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Developer Reference for Intel® oneAPI Math Kernel Library for C

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