/*  stax.h  (C) 1997 Mark A. Livingston */
/* Any non-commercial use of this code is permitted so long as */
/* the above copyright line appears in the file.  Please contact */
/* the author regarding permission for commercial use. */

#ifndef SQR
#define SQR(a) ( (a) * (a) )
#endif

enum { AVG = 0, MIN, MAX, STD, NSTATS };

typedef struct {
  double s[ NSTATS ];
  int n;
} Stat;

#define H_MIN 0 /* slot for below least significant cell of histogram */
#define H_MAX 1 /* slot for above most significant cell of histogram */
#define H_BASE 2 /* first slot for within the range of histogram */

typedef struct {
  int *slot, numSlots;
  double min, max, width;
} Hist;

/* Functions for running average, std dev, min and max */
void stxInit( int n );
void stxUpdate( int i, double v );
void stxPrint( int i, char *hdr, char *name );
void stxClear( int i ); /* resets, for per frame stats */

/* Functions for histograms */
void stxHistInit( int n, double *mins, double *maxs, double *widths );
void stxHistUpdate( int i, double v );
void stxHistPrint( int i );