Visible to Intel only — GUID: GUID-A2B1E805-2867-483C-8C1D-1CDA4B40B802
Visible to Intel only — GUID: GUID-A2B1E805-2867-483C-8C1D-1CDA4B40B802
ErfInv
Computes the inverse error function value.
Syntax
IppStatus ippsErfInv_32f_A11 (const Ipp32f* pSrc, Ipp32f* pDst, Ipp32s len);
IppStatus ippsErfInv_32f_A21 (const Ipp32f* pSrc, Ipp32f* pDst, Ipp32s len);
IppStatus ippsErfInv_32f_A24 (const Ipp32f* pSrc, Ipp32f* pDst, Ipp32s len);
IppStatus ippsErfInv_64f_A26 (const Ipp64f* pSrc, Ipp64f* pDst, Ipp32s len);
IppStatus ippsErfInv_64f_A50 (const Ipp64f* pSrc, Ipp64f* pDst, Ipp32s len);
IppStatus ippsErfInv_64f_A53 (const Ipp64f* pSrc, Ipp64f* 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 the inverse error function value for each element of pSrc and stores the result in the corresponding element of pDst.
For single precision data:
function flavor ippsErfInv_32f_A11 guarantees 11 correctly rounded bits of significand, or at least 3 exact decimal digits;
function flavor ippsErfInv_32f_A21 guarantees 21 correctly rounded bits of significand, or 4 ulps, or about 6 exact decimal digits;
function flavor ippsErfInv_32f_A24 guarantees 24 correctly rounded bits of significand, including the implied bit, with the maximum guaranteed error within 1 ulp.
For double precision data:
function flavor ippsErfInv_64f_A26 guarantees 26 correctly rounded bits of significand, or 6.7E+7 ulps, or approximately 8 exact decimal digits;
function flavor ippsErfInv_64f_A50 guarantees 50 correctly rounded bits of significand, or 4 ulps, or approximately 15 exact decimal digits;
function flavor ippsErfInv_64f_A53 guarantees 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] = erfinv(pSrc[n]), 0 ≤ n < len, where erfinv(x) = erf -1(x), and erf(x) denotes the error function defined as given by:
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 |
Indicates a warning that the argument is out of the function domain, that is, at least one of pSrc elements has the absolute value greater than 1. |
ippStsSingularity |
Indicates a warning that the argument is a singularity point, that is, at least one of the elements of pSrc has the absolute value equal to 1. |
Example
The example below shows how to use the function ippsErfcInv.
IppStatus ippsErfInv_32f_A21_sample(void) { const Ipp32f x[4] = {-0.842, 0.638, -0.345, -0.774}; Ipp32f y[4]; IppStatus st = ippsErfInv_32f_A21( x, y, 4 ); printf(" ippsErfInv_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:
ippsErfInv_32f_A21: x = -0.842 0.638 -0.345 -0.774 y = -0.998 0.645 -0.316 -0.856