Ln
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 bypDst
[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 bypSrcDst
[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 thepSrc,pDst, orpSrcDstpointer isNULL.
- ippStsSizeErr
- Indicates an error whenlenis 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
:
/*******************************************************************************
* Copyright 2015-2020 Intel Corporation.
*
* This software and the related documents are Intel copyrighted materials, and
* your use of them is governed by the express license under which they were
* provided to you (License). Unless the License provides otherwise, you may not
* use, modify, copy, publish, distribute, disclose or transmit this software or
* the related documents without Intel's prior written permission.
*
* This software and the related documents are provided as is, with no express
* or implied warranties, other than those that are expressly stated in the
* License.
*******************************************************************************/
#include <stdio.h>
#include "ipp.h"
/* Next two defines are created to simplify code reading and understanding */
#define EXIT_MAIN exitLine: /* Label for Exit */
#define check_sts(st) if((st) != ippStsNoErr) goto exitLine; /* Go to Exit if Intel(R) Integrated Primitives (Intel(R) IPP) function returned status different from ippStsNoErr */
/* Results of ippMalloc() are not validated because Intel(R) IPP functions perform bad arguments check and will return an appropriate status */
int main()
{
int len = 32;
int i;
Ipp16s *pSrc = ippsMalloc_16s(len * sizeof(Ipp16s));
Ipp16s *pDst = ippsMalloc_16s(len * sizeof(Ipp16s));
IppStatus status;
int scale = 0; //without scaling
printf("\n\nSource vector\n");
for (i = 0; i < len; i++)
{
pSrc[i] = 2 + i;
printf("%d; ", pSrc[i]);
}
check_sts(status = ippsLn_16s_Sfs(pSrc, pDst, len, scale));
printf("\n\nResult\n");
for (i = 0; i < len; i++) printf("%d; ", pDst[i]);
printf("\n\n");
EXIT_MAIN
ippsFree(pSrc);
ippsFree(pDst);
printf("Exit status %d (%s)\n", (int)status, ippGetStatusString(status));
return (int)status;
} Ln_I
:
/*******************************************************************************
* Copyright 2015-2020 Intel Corporation.
*
* This software and the related documents are Intel copyrighted materials, and
* your use of them is governed by the express license under which they were
* provided to you (License). Unless the License provides otherwise, you may not
* use, modify, copy, publish, distribute, disclose or transmit this software or
* the related documents without Intel's prior written permission.
*
* This software and the related documents are provided as is, with no express
* or implied warranties, other than those that are expressly stated in the
* License.
*******************************************************************************/
#include <stdio.h>
#include "ipp.h"
/* Next two defines are created to simplify code reading and understanding */
#define EXIT_MAIN exitLine: /* Label for Exit */
#define check_sts(st) if((st) != ippStsNoErr) goto exitLine; /* Go to Exit if Intel(R) Integrated Primitives (Intel(R) IPP) function returned status different from ippStsNoErr */
/* Results of ippMalloc() are not validated because Intel(R) IPP functions perform bad arguments check and will return an appropriate status */
int main()
{
int len = 32;
int i;
Ipp16s *pSrcDst = ippsMalloc_16s(len * sizeof(Ipp16s));
IppStatus status;
int scale = 0; //without scaling
printf("\n\nSource vector\n");
for (i = 0; i < len; i++)
{
pSrcDst[i] = 2 + i;
printf("%d; ", pSrcDst[i]);
}
check_sts(status = ippsLn_16s_ISfs(pSrcDst, len, scale));
printf("\n\nResult\n");
for (i = 0; i < len; i++) printf("%d; ", pSrcDst[i]);
printf("\n\n");
EXIT_MAIN
ippsFree(pSrcDst);
printf("Exit status %d (%s)\n", (int)status, ippGetStatusString(status));
return (int)status;
}