Acos
Acos
Computes inverse cosine of each vector element.
Syntax
IppStatus ippsAcos_32f_A11 (const Ipp32f*
pSrc
, Ipp32f*
pDst
, Ipp32s
len
);
IppStatus ippsAcos_32f_A21 (const Ipp32f*
pSrc
, Ipp32f*
pDst
, Ipp32s
len
);
IppStatus ippsAcos_32f_A24 (const Ipp32f*
pSrc
, Ipp32f*
pDst
, Ipp32s
len
);
IppStatus ippsAcos_64f_A26 (const Ipp64f*
pSrc
, Ipp64f*
pDst
, Ipp32s
len
);
IppStatus ippsAcos_64f_A50 (const Ipp64f*
pSrc
, Ipp64f*
pDst
, Ipp32s
len
);
IppStatus ippsAcos_64f_A53 (const Ipp64f*
pSrc
, Ipp64f*
pDst
, Ipp32s
len
);
IppStatus ippsAcos_32fc_A11 (const Ipp32fc*
pSrc
, Ipp32fc*
pDst
, Ipp32s
len
);
IppStatus ippsAcos_32fc_A21 (const Ipp32fc*
pSrc
, Ipp32fc*
pDst
, Ipp32s
len
);
IppStatus ippsAcos_32fc_A24 (const Ipp32fc*
pSrc
, Ipp32fc*
pDst
, Ipp32s
len
);
IppStatus ippsAcos_64fc_A26 (const Ipp64fc*
pSrc
, Ipp64fc*
pDst
, Ipp32s
len
);
IppStatus ippsAcos_64fc_A50 (const Ipp64fc*
pSrc
, Ipp64fc*
pDst
, Ipp32s
len
);
IppStatus ippsAcos_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 the inverse cosine of each element of
pSrc
, and stores the result in the corresponding element of
pDst
.
For single precision data:
function flavors
ippsAcos_32f_A11
and
ippsAcos_32cf_A11
guarantee 11 correctly rounded bits of significand, or at least 3 exact decimal digits;
function flavors
ippsAcos_32f_A21
and
ippsAcos_32fc_A21
guarantee 21 correctly rounded bits of significand, or 4 ulps, or about 6 exact decimal digits;
function flavors
ippsAcos_32f_A24
and
ippsAcos_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
ippsAcos_64f_A26
and
ippsAcos_64fc_A26
guarantee 26 correctly rounded bits of significand, or 6.7E+7 ulps, or approximately 8 exact decimal digits;
function flavors
ippsAcos_64f_A50
and
ippsAcos_64fc_A50
guarantee 50 correctly rounded bits of significand, or 4 ulps, or approximately 15 exact decimal digits;
function flavors
ippsAcos_64f_A53
and
ippsAcos_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] = acos(
pSrc
[n])
0 ≤ n <
.
len
Return Values
- ippStsNoErr
- Indicates no error.
- ippStsNullPtrErr
- Indicates an error whenpSrcorpDstpointer isNULL.
- ippStsSizeErr
- Indicates an error whenlenis 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 ofpSrchas an absolute value greater than 1.
Example
The example below shows how to use the function
ippsAcos
. IppStatus ippsAcos_32f_A21_sample(void)
{
const Ipp32f x[4] = {0.079, -0.715, -0.076, -0.529};
Ipp32f y[4];
IppStatus st = ippsAcos_32f_A21( x, y, 4 );
printf(" ippsAcos_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:
ippsAcos_32f_A21:
x = 0.079 -0.715 -0.076 -0.529
y = 1.492 2.368 1.647 2.129