Intel® Integrated Performance Primitives (Intel® IPP) Developer Guide and Reference

ID 790148
Date 3/22/2024
Public
Document Table of Contents

MeanStdDev

Computes the mean value and the standard deviation value of a vector.

Syntax

IppStatus ippsMeanStdDev_32f(const Ipp32f* pSrc, int len, Ipp32f* pMean, Ipp32f* pStdDev, IppHintAlgorithm hint);

IppStatus ippsMeanStdDev_64f(const Ipp64f* pSrc, int len, Ipp64f* pMean, Ipp64f* pStdDev);

IppStatus ippsMeanStdDev_16s_Sfs(const Ipp16s* pSrc, int len, Ipp16s* pMean, Ipp16s* pStdDev, int scaleFactor);

IppStatus ippsMeanStdDev_16s32s_Sfs(const Ipp16s* pSrc, int len, Ipp32s* pMean, Ipp32s* pStdDev, int scaleFactor);

Include Files

ipps.h

Domain Dependencies

Headers: ippcore.h, ippvm.h

Libraries: ippcore.lib, ippvm.lib

Parameters

pSrc

Pointer to the source vector.

pMean

Pointer to the output result - mean value.

pStdDev

Pointer to the output result - standard deviation.

len

Number of elements in the vector

hint

Suggests using specific code. The possible values for the hint argument are described in Hint Arguments.

scaleFactor

Scale factor, refer to Integer Scaling.

Description

This function computes both the mean value and the standard deviation of the input vector pSrc, and stores the results in pMean and pStdDev respectively. The vector length can not be less than 2. The mean of pSrc is defined by the formula:



The standard deviation of pSrc is defined by the unbiased estimate formula:



The hint argument suggests using specific code, either faster but less accurate calculation, or more accurate but slower calculation.

Return Values

ippStsNoErr

Indicates no error.

ippStsNullPtrErr

Indicates an error when one of the specified pointers is NULL.

ippStsSizeErr

Indicates an error when len is less than or equal to 1.