UpdatePower

Integrates the square of an input vector with specified integration weight.

Syntax

IppStatus ippsUpdatePower_16s32s_I(const Ipp16s* pSrc, int len, Ipp32s* pSrcDst, int srcShiftRight,Ipp16s alpha, IppHintAlgorithm hint);

Parameters

pSrc	Pointer to the source vector.
len	Number of elements of the vector.
pSrcDst	Pointer to input and output
srcShiftRight	Shift value.
alpha	Integration weight.
hint	Suggests using specific code. The possible values for the hint argument are described in Hint Arguments.

Description

The function ippsUpdatePower is declared in the ipps.h file. This function performs len iterations in which the sum alpha * pSrcDst + (1 - alpha) * (pSrc[i] *pSrc[i]) _shift is calculated and stored in pSrcDst. Here i is the number of previous iterations, pSrcDst is the result of previous iteration, and (pSrc[i] * pSrc[i]) _shift is the squared i-th element right-shifted by the non-negative value srcShiftRight.

The example below shows how to use the function ippsUpdatePower.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error when at least one of the specified pointers is NULL.
ippStsSizeErr	Indicates an error when len is less than or equal to 0.

Using the Function ippsUpdatePower

void func_updatepower()

    Ipp16s pSrc[2] = {16, 32};

    Ipp32s pSrcDst = 1;

    Ipp16s alpha = 3;

    int shift = 1;

    int srcLen = 2;

    ippsUpdatePower_16s32s_I(pSrc, 2, &pSrcDst, shift, alpha, ippAlgHintFast);

Result:  -1783