Sqr

Computes a square of each element of a vector.

Syntax

IppStatus ippsSqr_32f(const Ipp32f* pSrc, Ipp32f* pDst, int len);

IppStatus ippsSqr_64f(const Ipp64f* pSrc, Ipp64f* pDst, int len);

IppStatus ippsSqr_32fc(const Ipp32fc* pSrc, Ipp32fc* pDst, int len);

IppStatus ippsSqr_64fc(const Ipp64fc* pSrc, Ipp64fc* pDst, int len);

IppStatus ippsSqr_32f_I(Ipp32f* pSrcDst, int len);

IppStatus ippsSqr_64f_I(Ipp64f* pSrcDst, int len);

IppStatus ippsSqr_32fc_I(Ipp32fc* pSrcDst, int len);

IppStatus ippsSqr_64fc_I(Ipp64fc* pSrcDst, int len);

IppStatus ippsSqr_8u_Sfs(const Ipp8u* pSrc, Ipp8u* pDst, int len, int scaleFactor);

IppStatus ippsSqr_16s_Sfs(const Ipp16s* pSrc, Ipp16s* pDst, int len, int scaleFactor);

IppStatus ippsSqr_16u_Sfs(const Ipp16u* pSrc, Ipp16u* pDst, int len, int scaleFactor);

IppStatus ippsSqr_16sc_Sfs(const Ipp16sc* pSrc, Ipp16sc* pDst, int len, int scaleFactor);

IppStatus ippsSqr_8u_ISfs(Ipp8u* pSrcDst, int len, int scaleFactor);

IppStatus ippsSqr_16s_ISfs(Ipp16s* pSrcDst, int len, int scaleFactor);

IppStatus ippsSqr_16u_ISfs(Ipp16u* pSrcDst, int len, int scaleFactor);

IppStatus ippsSqr_16sc_ISfs(Ipp16sc* pSrcDst, int len, int scaleFactor);

Parameters

pSrc	Pointer to the source vector.
pDst	Pointer to the destination vector.
pSrcDst	Pointer to the source and destination vector for in-place operations.
len	Number of elements in the vector
scaleFactor	Scale factor, refer to Integer Scaling.

Description

The function ippsSqr is declared in the ipps.h file. This function computes the square of each element of the vector pSrc, and stores the result in pDst. The computation is performed as follows:

pDst[n] = pSrc[ n]²

The in-place flavors of ippsSqrcompute the square of each element of the vector pSrcDst and store the result in pSrcDst. The computation is performed as follows:

pSrcDst[n] = pSrcDst[ n]²

When computing the square of an integer number, the output result can exceed the data range and become saturated. To get a precise result, use the scale factor. The example below shows how to get the value of 200². Without scaling this result is clipped to 32767. Scaling retains the output data range but results in the precision loss in low-order bits.

Return Values

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

Using the ippsSqr Function

IppStatus sqr(void) {

      Ipp16s x[4] = {-3, 2, 30, 200};

      IppStatus st = ippsSqr_16s_ISfs(x, 4, 1);

      printf_16s(“sqr =”, x, 4, st);

      return st;

Output:

    sqr =  4 2 450 20000