Computes Cauchy robust error function and its first and second derivatives
Syntax
IppStatus ippsCauchy_32f_I(Ipp32f* pSrcDst, int len, Ipp32f param);
IppStatus ippsCauchyD_32f_I(Ipp32f* pSrcDst, int len, Ipp32f param);
IppStatus ippsCauchyDD2_32f_I(Ipp32f* pSrcDst, Ipp32f* pD2FVal, int len, Ipp32f param);
Parameters
pSrcDst |
Pointer to the source and destination vector. |
len |
Number of elements in the vector |
pD2FVal |
Pointer to the array of the values of the second derivatives. |
param |
Parameter C of the Cuachy function. |
Description
These functions are declared in the ipps.h file. For len elements of the source vector pSrcDst the function perform the following operations:
the function ippsCauchy calculates the Cauchy function and stores the results in the vector pSrcDst;
the function ippsCauchyD calculates first derivatives of the Cauchy function and stores the results in the vector pSrcDst;
the function ippsCauchyDD2 calculates first and second derivatives of the Cauchy function and stores the values of first derivatives in the vector pSrcDst, values of second derivatives - in the array pD2FVal.
The following pseudo-codes show how these operations are performed.
Calculating the Cauchy function (ippsCauchy):
for( int i = 0; i < len; i++ ) pSrcDst[i] = φC(pSrcDst[i]);
Calculating first derivatives of the Cauchy function (ippsCauchyD):
for( int i = 0; i < len; i++ ) pSrcDst[i] =ψC(pSrcDst[i]);
Calculating first and second derivatives of the Cauchy function (ippsCauchyDD2):
for( int i = 0; i < len; i++ ){
pD2FVal[i] = ψ'C(pSrcDst[i]);
pSrcDst[i] = ψC(pSrcDst[i]);
}
Here
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 0. |