MeanStdDev
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 thehintargument 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 isNULL.
- ippStsSizeErr
- Indicates an error whenlenis less than or equal to 1.