Visible to Intel only — GUID: GUID-5F301AB9-0651-4CE8-AAE2-938C389C924A
Visible to Intel only — GUID: GUID-5F301AB9-0651-4CE8-AAE2-938C389C924A
Ln
Computes natural logarithm of each vector element.
Syntax
IppStatus ippsLn_32f_A11 (const Ipp32f* pSrc, Ipp32f* pDst, Ipp32s len);
IppStatus ippsLn_32f_A21 (const Ipp32f* pSrc, Ipp32f* pDst, Ipp32s len);
IppStatus ippsLn_32f_A24 (const Ipp32f* pSrc, Ipp32f* pDst, Ipp32s len);
IppStatus ippsLn_64f_A26 (const Ipp64f* pSrc, Ipp64f* pDst, Ipp32s len);
IppStatus ippsLn_64f_A50 (const Ipp64f* pSrc, Ipp64f* pDst, Ipp32s len);
IppStatus ippsLn_64f_A53 (const Ipp64f* pSrc, Ipp64f* pDst, Ipp32s len);
IppStatus ippsLn_32fc_A11 (const Ipp32fc* pSrc, Ipp32fc* pDst, Ipp32s len);
IppStatus ippsLn_32fc_A21 (const Ipp32fc* pSrc, Ipp32fc* pDst, Ipp32s len);
IppStatus ippsLn_32fc_A24 (const Ipp32fc* pSrc, Ipp32fc* pDst, Ipp32s len);
IppStatus ippsLn_64fc_A26 (const Ipp64fc* pSrc, Ipp64fc* pDst, Ipp32s len);
IppStatus ippsLn_64fc_A50 (const Ipp64fc* pSrc, Ipp64fc* pDst, Ipp32s len);
IppStatus ippsLn_64fc_A53 (const Ipp64fc* pSrc, Ipp64fc* pDst, Ipp32s len);
Include Files
ippvm.h
Domain Dependencies
Headers: ippcore.h
Libraries: ippcore.lib
Parameters
pSrc |
Pointer to the source vector. |
pDst |
Pointer to the destination vector. |
len |
Number of elements in the vectors. |
Description
This function computes a natural logarithm of each element of pSrc and stores the result in the corresponding element of pDst.
For single precision data:
function flavors ippsLn_32f_A11and ippsLn_32cf_A11 guarantee 11 correctly rounded bits of significand, or at least 3 exact decimal digits;
function flavors ippsLn_32f_A21 and ippsLn_32fc_A21 guarantee 21 correctly rounded bits of significand, or 4 ulps, or about 6 exact decimal digits;
function flavors ippsLn_32f_A24 and ippsLn_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 ippsLn_64f_A26 and ippsLn_64fc_A26 guarantee 26 correctly rounded bits of significand, or 6.7E+7 ulps, or approximately 8 exact decimal digits;
function flavors ippsLn_64f_A50 and ippsLn_64fc_A50 guarantee 50 correctly rounded bits of significand, or 4 ulps, or approximately 15 exact decimal digits;
function flavors ippsLn_64f_A53 and ippsLn_64fc_A53 guarantee 53 correctly rounded bits of significand, including the implied bit, with the maximum guaranteed error within 1 ulp.
The computation is performed as follows:
pDst[n] = loge(pSrc[n]), 0 ≤ n < len.
Return Values
ippStsNoErr |
Indicates no error. |
ippStsNullPtrErr |
Indicates an error when pSrc 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 of the elements of pSrc is less than 0. |
IppStsSingularity |
In real functions, indicates a warning that the argument is the singularity point, that is, at least one of the elements of pSrc is equal to 0. |
Example
The example below shows how to use the function ippsLn.
IppStatus ippsLn_32f_A21_sample(void) { const Ipp32f x[4] = {0.188, 3.841, 5.363, 5.755}; Ipp32f y[4]; IppStatus st = ippsLn_32f_A21( x, y, 4 ); printf(" ippsLn_32f_A21:\n"); printf(" x = %.3f %.3f %.3f %.3f \n", x[0], x[1], x[2], x[3]); printf(" y = %.3f %.3f %.3f %.3f \n", y[0], y[1], y[2], y[3]); return st; }
Output:
ippsLn_32f_A21: x = 0.188 3.841 5.363 5.755 y = -1.670 1.346 1.680 1.750