Erf
Erf
Computes the error function value.
Syntax
IppStatus ippsErf_32f_A11 (const Ipp32f*
pSrc
, Ipp32f*
pDst
, Ipp32s
len
);
IppStatus ippsErf_32f_A21 (const Ipp32f*
pSrc
, Ipp32f*
pDst
, Ipp32s
len
);
IppStatus ippsErf_32f_A24 (const Ipp32f*
pSrc
, Ipp32f*
pDst
, Ipp32s
len
);
IppStatus ippsErf_64f_A26 (const Ipp64f*
pSrc
, Ipp64f*
pDst
, Ipp32s
len
);
IppStatus ippsErf_64f_A50 (const Ipp64f*
pSrc
, Ipp64f*
pDst
, Ipp32s
len
);
IppStatus ippsErf_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 error function value for each element of
pSrc
and stores the result in the corresponding element of pDst
.For single precision data:
function flavor
ippsErf_32f_A11
guarantees 11 correctly rounded bits of significand, or at least 3 exact decimal digits;function flavor
ippsErf_32f_A21
guarantees 21 correctly rounded bits of significand, or 4 ulps, or about 6 exact decimal digits;function flavor
ippsErf_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
ippsErf_64f_A26
guarantees 26 correctly rounded bits of significand, or 6.7E+7 ulps, or approximately 8 exact decimal digits;function flavor
ippsErf_64f_A50
guarantees 50 correctly rounded bits of significand, or 4 ulps, or approximately 15 exact decimal digits;function flavor
ippsErf_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] = erf(pSrc
[n])0 ≤ n <
, where len
Return Values
- ippStsNoErr
- Indicates no error.
- ippStsNullPtrErr
- Indicates an error whenpSrcorpDstpointer isNULL.
- ippStsSizeErr
- Indicates an error whenlenis less than or equal to 0.
Example
The example below shows how to use the function
ippsErf
.IppStatus ippsErf_32f_A21_sample(void)
{
const Ipp32f x[4] = {-0.982, 0.838, -0.448, -0.454};
Ipp32f y[4];
IppStatus st = ippsErf_32f_A21( x, y, 4 );
printf(" ippsErf_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 results:
ippsErf_32f_A21:
x = -0.982 0.838 -0.448 -0.454
y = -0.835 0.764 -0.474 -0.479