Mul

Performs element by element multiplication of two vectors.

Syntax

IppStatus ippsMul_32f_A24 (const Ipp32f* pSrc1, const Ipp32f* pSrc2, Ipp32f* pDst, Ipp32s len);

IppStatus ippsMul_64f_A53 (const Ipp64f* pSrc1, const Ipp64f* pSrc2, Ipp64f* pDst, Ipp32s len);

IppStatus ippsMul_32fc_A11 (const Ipp32fc* pSrc1, const Ipp32fc* pSrc2, Ipp32fc* pDst, Ipp32s len);

IppStatus ippsMul_32fc_A21 (const Ipp32fc* pSrc1, const Ipp32fc* pSrc2, Ipp32fc* pDst, Ipp32s len);

IppStatus ippsMul_32fc_A24 (const Ipp32fc* pSrc1, const Ipp32fc* pSrc2, Ipp32fc* pDst, Ipp32s len);

IppStatus ippsMul_64fc_A26 (const Ipp64fc* pSrc1, const Ipp64fc* pSrc2, Ipp64fc* pDst, Ipp32s len);

IppStatus ippsMul_64fc_A50 (const Ipp64fc* pSrc1, const Ipp64fc* pSrc2, Ipp64fc* pDst, Ipp32s len);

IppStatus ippsMul_64fc_A53 (const Ipp64fc* pSrc1, const Ipp64fc* pSrc2, Ipp64fc* pDst, Ipp32s len);

Parameters

pSrc1	Pointer to the first source vector.
pSrc2	Pointer to the second source vector.
pDst	Pointer to the destination vector.
len	Number of elements in the vectors.

Description

The function ippsMul is declared in the ippvm.h file. This function performs element by element multiplication of the vectors pSrc1 and pSrc2, and stores the result in the corresponding element of the vector pDst.

For single precision data:

function flavor ippsMul_32fc_A11 guarantees 11 correctly rounded bits of significand, or at least 3 exact decimal digits;

function flavor ippsMul_32fc_A21 guarantees 21 correctly rounded bits of significand, or 4 ulps, or about 6 exact decimal digits;

function flavors ippsMul_32f_A24 and ippsMul_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 flavor ippsMul_64fc_A26 guarantees 26 correctly rounded bits of significand, or 6.7E+7 ulps, or approximately 8 exact decimal digits;

function flavor ippsMul_64fc_A50 guarantees 50 correctly rounded bits of significand, or 4 ulps, or approximately 15 exact decimal digits;

function flavors ippsMul_64f_A53 and ippsMul_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] = (pSrc1[n]) x (pSrc2[n]), 0 ≤ n < len.

The example below shows how to use the function ippsMul.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error when pSrc1, pSrc2 or pDst pointer is NULL.
ippStsSizeErr	Indicates an error when len is less than or equal to 0.

Using ippsMul Function

IppStatus ippsMul_32f_A24_sample(void)

const Ipp32f x1[4] = {+4.885, -0.543, -3.809, -4.953};

const Ipp32f x2[4] = {-0.543, -3.809, -4.953, +4.885};

Ipp32f  y[4];

	IppStatus st = ippsMul_32f_A24( x1, x2, y, 4 );

	printf(" ippsMul_32f_A24:\n");

	printf(" x1 = %+.3f %+.3f %+.3f %+.3f \n", x1[0], x1[1], x1[2], x1[3]);

	printf(" x2 = %+.3f %+.3f %+.3f %+.3f \n", x2[0], x2[1], x2[2], x2[3]);

	printf(" y  = %+.3f %+.3f %+.3f %+.3f \n",  y[0],  y[1],  y[2],  y[3]);

	return st;

Output results:

 ippsMul_32f_A24:

 x1 = +4.885 -0.543 -3.809 -4.953

 x2 = -0.543 -3.809 -4.953 +4.885

  y = -2.653 +2.068 +18.866 -24.195