ConjPack

Syntax

IppStatus ippsConjPack_16sc(const Ipp16s* pSrc, Ipp16sc* pDst, int lenDst);

IppStatus ippsConjPack_32fc(const Ipp32f* pSrc, Ipp32fc* pDst, int lenDst);

IppStatus ippsConjPack_64fc(const Ipp64f* pSrc, Ipp64fc* pDst, int lenDst);

IppStatus ippsConjPack_16sc_I(Ipp16sc* pSrcDst, int lenDst);

IppStatus ippsConjPack_32fc_I(Ipp32fc* pSrcDst, int lenDst);

IppStatus ippsConjPack_64fc_I(Ipp64fc* pSrcDst, int lenDst);

Parameters

pSrc	Pointer to the source vector.
pDst	Pointer to the destination vector.
pSrcDst	Pointer to the source and destination vector (for the in-place operation).
lenDst	Number of elements in the vector.

Description

The function ippsConjPack is declared in the ipps.h file. This function converts the data in

format in the vector pSrc to complex data format and stores the results in pDst.

The in-place function ippsConjPack converts the data in Pack format in the vector pSrcDst to complex data format and stores the results in pSrcDst.

The table below shows the examples of unpack from the Pack format. The Data column contains the real input data to be converted by the forward FFT transform to the packed data. The packed real data are in the Packed column. The output result is the complex data vector in the Extended column. The number of vector elements is in the Length column.

Examples of Unpack from the Pack Format
Data	Packed	Extended	Length
FFT([1])	1	{1, 0}	1
FFT([1 2])	3, -1	{3, 0}, {-1, 0}	2
FFT([1 2 3])	6, -1.5, 0.86	{6, 0}, {-1.5, 0.86}, {-1.5, -0.86}	3
FFT([1 2 3 9])	15, -2, 7, -7	{15, 0}, {-2, 7}, {-7, 0}, {-2, -7}	4

Code example below shows how to use the function ippsConjPack.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error when the pSrcDst, pDst, or pSrc pointer is NULL.
ippStsSizeErr	Indicates an error when lenDst is less than or equal to 0.

Using the ippsConjPack Function

void ConjPack(void) {

      Ipp16s x[8] = {1,2,3,5,6,7,8,9};

      Ipp16sc zero={0,0}, y[6];

      IppStatus st;

      ippsSet_16sc( zero, y, 6 );

      st = ippsConjPack_16sc( x, y, 6 );

      printf_16sc(“pack 6”, y, 6, st );

      ippsSet_16sc( zero, y, 6 );

      st = ippsConjPack_16sc( x, y, 5 );

      printf_16sc(“pack 5”, y, 5, st );

Output:
    Pack 6: {1,0} {2,3} {5,6} {7,0} {5,-6} {2,-3}

    Pack 5: {1,0} {2,3} {5,6} {5,-6} {2,-3}