norms.hpp

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#include <cmath>
#include "pcl/win32_macros.h"

namespace pcl
{

inline float L1_Norm (float *a, float *b, int dim)
{
  float norm = 0.0f;
  for (int i = 0; i < dim; ++i)
    norm += fabsf(*(a++) - *(b++));
  return norm;
}


inline float L2_Norm_SQR (float *a, float *b, int dim)
{
  float norm = 0.0;
  for (int i = 0; i < dim; ++i)
  {
    float diff  =  *(a++) - *(b++);
    norm += diff*diff;
  }
  return norm;
}


inline float L2_Norm (float *a, float *b, int dim)
{
  return sqrtf(L2_Norm_SQR(a, b, dim));
}


inline float Linf_Norm (float *a, float *b, int dim)
{
  float norm = 0.0;
  for (int i = 0; i < dim; ++i)
    norm = (std::max)(fabsf(*(a++) - *(b++)), norm);
  return norm;
}


inline float JM_Norm (float *a, float *b, int dim)
{
  float norm = 0.0;

  for (int i = 0; i < dim; ++i)
    norm += (sqrtf (a[i]) - sqrtf (b[i])) * (sqrtf (a[i]) - sqrtf (b[i]));

  return sqrtf (norm);
}


inline float B_Norm (float *a, float *b, int dim)
{
  float norm = 0.0, result;

  for (int i = 0; i < dim; ++i)
    norm += sqrtf (a[i] * b[i]);

  if (norm > 0)
    result = -log (norm);
  else
    result = 0;

  return result;
}


inline float Sublinear_Norm (float *a, float *b, int dim)
{
  float norm = 0.0;

  for (int i = 0; i < dim; ++i)
    norm += sqrtf (fabsf (a[i] - b[i]));

  return norm;
}


inline float CS_Norm (float *a, float *b, int dim)
{
  float norm = 0.0;

  for (int i = 0; i < dim; ++i)
    if ((a[i] + b[i]) != 0)
      norm += (a[i] - b[i]) * (a[i] - b[i]) / (a[i] + b[i]);
    else
      norm += 0;
  return norm;
}


inline float Div_Norm (float *a, float *b, int dim)
{
  float norm = 0.0;

  for (int i = 0; i < dim; ++i)
    if ((a[i] / b[i]) > 0)
      norm += (a[i] - b[i]) * log (a[i] / b[i]);
    else
      norm += 0;
  return norm;
}


inline float PF_Norm (float *a, float *b, int dim, float P1, float P2)
{
  float norm = 0.0;

  for (int i = 0; i < dim; ++i)
    norm += (P1 * a[i] - P2 * b[i]) * (P1 * a[i] - P2 * b[i]);
  return sqrtf (norm);
}


inline float K_Norm (float *a, float *b, int dim, float P1, float P2)
{
  float norm = 0.0;

  for (int i = 0; i < dim; ++i)
    norm += fabsf (P1 * a[i] - P2 * b[i]);
  return norm;
}


inline float KL_Norm (float *a, float *b, int dim)
{
  float norm = 0.0;

  for (int i = 0; i < dim; ++i)
    if ( (b[i] != 0) && ((a[i] / b[i]) > 0) )
      norm += a[i] * log (a[i] / b[i]);
    else
      norm += 0;
  return norm;
}

inline float HIK_Norm(float *a, float *b, int dim)
{
  float norm = 0.0f;
  for (int i = 0; i < dim; ++i)
    norm += (std::min)(*(a++), *(b++));
  return norm;
}

}

---

pcl
Author(s): See http://pcl.ros.org/authors for the complete list of authors.
autogenerated on Fri Jan 11 09:55:22 2013