Intel® Integrated Performance Primitives Developer Reference

Developer Reference

  • 2021
  • 03/26/2021
  • Public Content
Contents

NormDiff

Computes the C, L1, L2, or L2Sqr norm of two vectors' difference.

Syntax

IppStatus ippsNormDiff_Inf_32f(const Ipp32f*
pSrc1
, const Ipp32f*
pSrc2
, int
len
, Ipp32f*
pNorm
);
IppStatus ippsNormDiff_Inf_64f(const Ipp64f*
pSrc1
, const Ipp64f*
pSrc2
, int
len
, Ipp64f*
pNorm
);
IppStatus ippsNormDiff_Inf_16s32f(const Ipp16s*
pSrc1
, const Ipp16s*
pSrc2
, int
len
, Ipp32f*
pNorm
);
IppStatus ippsNormDiff_Inf_32fc32f(const Ipp32fc*
pSrc1
, const Ipp32fc*
pSrc2
, int
len
, Ipp32f*
pNorm
);
IppStatus ippsNormDiff_Inf_64fc64f(const Ipp64fc*
pSrc1
, const Ipp64fc*
pSrc2
, int
len
, Ipp64f*
pNorm
);
IppStatus ippsNormDiff_L1_32f(const Ipp32f*
pSrc1
, const Ipp32f*
pSrc2
, int
len
, Ipp32f*
pNorm
);
IppStatus ippsNormDiff_L1_64f(const Ipp64f*
pSrc1
, const Ipp64f*
pSrc2
, int
len
, Ipp64f*
pNorm
);
IppStatus ippsNormDiff_L1_16s32f(const Ipp16s*
pSrc1
, const Ipp16s*
pSrc2
, int
len
, Ipp32f*
pNorm
);
IppStatus ippsNormDiff_L1_32fc64f(const Ipp32fc*
pSrc1
, const Ipp32fc*
pSrc2
, int
len
, Ipp64f*
pNorm
);
IppStatus ippsNormDiff_L1_64fc64f(const Ipp64fc*
pSrc1
, const Ipp64fc*
pSrc2
, int
len
, Ipp64f*
pNorm
);
IppStatus ippsNormDiff_L2_32f(const Ipp32f*
pSrc1
, const Ipp32f*
pSrc2
, int
len
, Ipp32f*
pNorm
);
IppStatus ippsNormDiff_L2_64f(const Ipp64f*
pSrc1
, const Ipp64f*
pSrc2
, int
len
, Ipp64f*
pNorm
);
IppStatus ippsNormDiff_L2_16s32f(const Ipp16s*
pSrc1
, const Ipp16s*
pSrc2
, int
len
, Ipp32f*
pNorm
);
IppStatus ippsNormDiff_L2_32fc64f(const Ipp32fc*
pSrc1
, const Ipp32fc*
pSrc2
, int
len
, Ipp64f*
pNorm
);
IppStatus ippsNormDiff_L2_64fc64f(const Ipp64fc*
pSrc1
, const Ipp64fc*
pSrc2
, int
len
, Ipp64f*
pNorm
);
IppStatus ippsNormDiff_L2Sqr_16s64s_Sfs(const Ipp16s*
pSrc1
, const Ipp16s*
pSrc2
, int
len
, Ipp64s*
pNorm
, int
scaleFactor
);
IppStatus ippsNormDiff_Inf_16s32s_Sfs(const Ipp16s*
pSrc1
, const Ipp16s*
pSrc2
, int
len
, Ipp32s*
pNorm
, int
scaleFactor
);
IppStatus ippsNormDiff_L1_16s32s_Sfs(const Ipp16s*
pSrc1
, const Ipp16s*
pSrc2
, int
len
, Ipp32s*
pNorm
, int
scaleFactor
);
IppStatus ippsNormDiff_L1_16s64s_Sfs(const Ipp16s*
pSrc1
, const Ipp16s*
pSrc2
, int
len
, Ipp64s*
pNorm
, int
scaleFactor
);
IppStatus ippsNormDiff_L2_16s32s_Sfs(const Ipp16s*
pSrc1
, const Ipp16s*
pSrc2
, int
len
, Ipp32s*
pNorm
, int
scaleFactor
);
Include Files
ipps.h
Domain Dependencies
Headers:
ippcore.h
,
ippvm.h
Libraries:
ippcore.lib
,
ippvm.lib
Parameters
pSrc1
,
pSrc2
Pointers to the two source vectors;
pSrc2
 can be
NULL
.
pNorm
Pointer to the output result.
len
Number of elements in the vector.
scaleFactor
Scale factor, refer to Integer Scaling.
Description
This function computes the
C
,
L1
,
L2
, or
L2Sqr
 norm of the source vectors' difference, and stores the result in
pNorm
.
ippsNormDiff_Inf
.
 The function
ippsNormDiff_Inf
 computes the
C
 norm defined by the formula:
ippsNormDiff_L1
.
 The function
ippsNormDiff_L1
 computes the
L1
 norm defined by the formula:
ippsNormDiff_L2
.
 The function
ippsNormDiff_L2
 computes the
L2
 norm defined by the formula:
ippsNormDiff_L2Sqr
.
 The function
ippsNormDiff_L2Sqr
 computes the
L2Sqr
 norm defined as square of the
L2
 norm.
Functions with
Sfs
 suffixes perform scaling of the result value in accordance with the
scaleFactor
 value.
Return Values
ippStsNoErr
Indicates no error.
ippStsNullPtrErr
Indicates an error when the
pSrc1
,
pSrc2
, or
pNorm
 pointer is
NULL
.
ippStsSizeErr
Indicates an error when
len
 is less than or equal to 0.

Example

The example below shows how to use the function
ippsNormDiff
.
int norm( void ) {
      Ipp16s x[LEN];
      Ipp32f Norm[3];
      IppStatus st;
      int i;
      for( i=0; i<LEN; ++i ) x[i] = (Ipp16s)rand();
      ippsNormDiff_Inf_16s32f( x, 0, LEN, Norm );
      ippsNormDiff_L1_16s32f( x, 0, LEN, Norm+1 );
      st = ippsNormDiff_L2_16s32f( x, 0, LEN, Norm+2 );
      printf_32f(“Norm (oo,L1,L2) =”, Norm, 3, st );
      return Norm[2] <= Norm[1] && Norm[1] <= LEN*Norm[0];
}
Output:
 Norm (oo,L1,L2) =  31993.000000 1526460.000000 180270.781250
Matlab* analog: 
    >> x = 32767*rand(1,100);norm(x,inf),norm(x,1),norm(x,2)

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.