wordrec/measure.h

Go to the documentation of this file.

#ifndef MEASURE_H
#define MEASURE_H

/*
----------------------------------------------------------------------
              I n c l u d e s
----------------------------------------------------------------------
*/

#include <math.h>

/*
----------------------------------------------------------------------
              T y p e s
----------------------------------------------------------------------
*/

typedef struct
{
  long num_samples;
  float sum_of_samples;
  float sum_of_squares;
} MEASUREMENT;

/*
----------------------------------------------------------------------
              M a c r o s
----------------------------------------------------------------------
*/

/* ================== */
#define ADD_SAMPLE(m,s)                           \
(m.sum_of_samples += (float) (s),               \
   m.sum_of_squares += (float) (s) * (float) (s), \
   ++m.num_samples)

#define MEAN(m)  \
((m).num_samples ? ((float) ((m).sum_of_samples / (m).num_samples)) : 0)

#define new_measurement(m)   \
((m).num_samples    = 0, \
   (m).sum_of_samples = 0, \
   (m).sum_of_squares = 0)

#define number_of_samples(m)  ((m).num_samples)

#define standard_deviation(m) ((float) sqrt (VARIANCE (m)))

#define VARIANCE(m)                                 \
(((m).num_samples > 1) ?                            \
   ((float)                                        \
   (((m).num_samples * (m).sum_of_squares -        \
      (m).sum_of_samples * (m).sum_of_samples) /  \
   (((m).num_samples - 1) * (m).num_samples)))   :  0)

#define print_summary(string,measure)                       \
cprintf ("\t%-20s \tn = %d, \tm = %4.2f, \ts = %4.2f\n ",  \
         string,                                          \
         number_of_samples  (measure),                    \
         MEAN           (measure),                    \
         standard_deviation (measure))
#endif

---