Powx

Intel® Integrated Performance Primitives Developer Guide and Reference

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ID 790148

Date 11/07/2023

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Powx

Raises each element of a vector to a constant power.

Syntax

IppStatus ippsPowx_32f_A11 (const Ipp32f* pSrc1, const Ipp32f ConstValue, Ipp32f* pDst, Ipp32s len);

IppStatus ippsPowx_32f_A21 (const Ipp32f* pSrc1, const Ipp32f ConstValue, Ipp32f* pDst, Ipp32s len);

IppStatus ippsPowx_32f_A24 (const Ipp32f* pSrc1, const Ipp32f ConstValue, Ipp32f* pDst, Ipp32s len);

IppStatus ippsPowx_64f_A26 (const Ipp64f* pSrc1, const Ipp64f ConstValue, Ipp64f* pDst, Ipp32s len);

IppStatus ippsPowx_64f_A50 (const Ipp64f* pSrc1, const Ipp64f ConstValue, Ipp64f* pDst, Ipp32s len);

IppStatus ippsPowx_64f_A53 (const Ipp64f* pSrc1, const Ipp64f ConstValue, Ipp64f* pDst, Ipp32s len);

IppStatus ippsPowx_32fc_A11 (const Ipp32fc* pSrc1, const Ipp32fc ConstValue, Ipp32fc* pDst, Ipp32s len);

IppStatus ippsPowx_32fc_A21 (const Ipp32fc* pSrc1, const Ipp32fc ConstValue, Ipp32fc* pDst, Ipp32s len);

IppStatus ippsPowx_32fc_A24 (const Ipp32fc* pSrc1, const Ipp32fc ConstValue, Ipp32fc* pDst, Ipp32s len);

IppStatus ippsPowx_64fc_A26 (const Ipp64fc* pSrc1, const Ipp64fc ConstValue, Ipp64fc* pDst, Ipp32s len);

IppStatus ippsPowx_64fc_A50 (const Ipp64fc* pSrc1, const Ipp64fc ConstValue, Ipp64fc* pDst, Ipp32s len);

IppStatus ippsPowx_64fc_A53 (const Ipp64fc* pSrc1, const Ipp64fc ConstValue, Ipp64fc* pDst, Ipp32s len);

Include Files

ippvm.h

Domain Dependencies

Headers: ippcore.h

Libraries: ippcore.lib

Parameters

pSrc1	Pointer to the source vector.
ConstValue	Constant value.
pDst	Pointer to the destination vector.
len	Number of elements in the vectors.

Description

This function raises each element of the vector pSrc1 to the constant power ConstValue and stores the result in the corresponding element of pDst.

For single precision data:

function flavors ippsPowx_32f_A11and ippsPowx_32cf_A11 guarantee 11 correctly rounded bits of significand, or at least 3 exact decimal digits;

function flavors ippsPowx_32f_A21 and ippsPowx_32fc_A21 guarantee 21 correctly rounded bits of significand, or 4 ulps, or about 6 exact decimal digits;

function flavors ippsPowx_32f_A24 and ippsPowx_32fc_A24 guarantee 24 correctly rounded bits of significand, including the implied bit, with the maximum guaranteed error within 1 ulp.

For double precision data:

function flavors ippsPowx_64f_A26 and ippsPowx_64fc_A26 guarantee 26 correctly rounded bits of significand, or 6.7E+7 ulps, or approximately 8 exact decimal digits;

function flavors ippsPowx_64f_A50 and ippsPowx_64fc_A50 guarantee 50 correctly rounded bits of significand, or 4 ulps, or approximately 15 exact decimal digits;

function flavors ippsPowx_64f_A53 and ippsPowx_64fc_A53 guarantee 53 correctly rounded bits of significand, including the implied bit, with the maximum guaranteed error within 1 ulp.

Note that for ippsPowx complex functions there may be argument ranges where the accuracy specification does not hold.

The computation is performed as follows:

pDst[n] = (pSrc[n])^ConstValue, 0 ≤ n < len.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error when pSrc1 or pDst pointer is NULL.
ippStsSizeErr	Indicates an error when len is less than or equal to 0.
ippStsDomain	In real functions, indicates a warning that the argument is out of the function domain, that is, at least one pair of the elements meets the following condition: element of pSrc1 is finite, less than 0, and ConstValue is finite, non-integer.
IppStsSingularity	In real functions, indicates a warning that the argument is the singularity point, that is, at least one pair of the elements is as follows: element of pSrc1 is equal to 0, and ConstValue is integer and less than 0.

Example

The example below shows how to use the function ippsPowx.

IppStatus ippsPowx_32f_A21_sample(void) {
	const Ipp32f x1[4] = {0.483, 0.565, 0.776, 0.252};
	const Ipp32f x2 = 0.823;
	Ipp32f y[4];
	IppStatus st = ippsPowx_32f_A21( x1, x2, y, 4 );
	
	printf(" ippsPowx_32f_A21:\n");
	printf(" x1 = %.3f %.3f %.3f %.3f \n", x1[0], x1[1], x1[2], x1[3]);
	printf(" x2 = %.3f \n", x2);
	printf(" y  = %.3f %.3f %.3f %.3f \n", y[0],  y[1],  y[2],  y[3]);
	return st;
}

Output results:

ippsPowx_32f_A21:
x1 = 0.483 0.565 0.776 0.252
x2 = 0.823
y  = 0.549 0.625 0.812 0.322

Parent topic: Power and Root Functions

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Intel® Integrated Performance Primitives Developer Guide and Reference

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Syntax

Include Files

Domain Dependencies

Parameters

Description

Return Values

Example