Developer Reference for Intel® Integrated Performance Primitives 2019

Ln

Computes the natural logarithm of each element of a vector.

Syntax

IppStatus ippsLn_32f(const Ipp32f* pSrc, Ipp32f* pDst, int len);

IppStatus ippsLn_64f(const Ipp64f* pSrc, Ipp64f* pDst, int len);

IppStatus ippsLn_16s_Sfs(const Ipp16s* pSrc, Ipp16s* pDst, int len, int scaleFactor);

IppStatus ippsLn_32s_Sfs(const Ipp32s* pSrc, Ipp32s* pDst, int len, int scaleFactor);

IppStatus ippsLn_16s_ISfs(Ipp16s* pSrcDst, int len, int scaleFactor);

IppStatus ippsLn_32s_ISfs(Ipp32s* pSrcDst, int len, int scaleFactor);

IppStatus ippsLn_32f_I(Ipp32f* pSrcDst, int len);

IppStatus ippsLn_64f_I(Ipp64f* pSrcDst, int len);

Include Files

ipps.h

Domain Dependencies

Headers: ippcore.h, ippvm.h

Libraries: ippcore.lib, ippvm.lib

Parameters

pSrc

Pointer to the source vector.

pDst

Pointer to the destination vector.

pSrcDst

Pointer to the source and destination vector for the in-place operation.

len

Number of elements in the vector

scaleFactor

Scale factor, refer to Integer Scaling.

Description

This function computes the natural logarithm of each element of the vector pSrc and stores the result in pDst as given by

pDst[n] = loge (pSrc[n])

The in-place flavors of ippsLn compute the natural logarithm of each element of the vector pSrcDst and store the result in pSrcDst as given by

pSrcDst[n] = loge (pSrcDst[n])

If the function ippsLn encounters a zero or negative value in the input, it returns a warning status and continues execution with the corresponding result value (see appendix A "Handling of Special Cases" for more information).

Return Values

ippStsNoErr

Indicates no error.

ippStsNullPtrErr

Indicates an error when the pSrc, pDst, or pSrcDst pointer is NULL.

ippStsSizeErr

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

ippStsLnZeroArg

Indicates a warning for zero-valued input vector elements.

ippStsLnNegArg

Indicates a warning for negative input vector elements.

Example

Ln.c

Ln_I.c