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/* Copyright (C) 2003 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#ifndef NDBT_STATS_HPP
#define NDBT_STATS_HPP
#include <ndb_global.h>
class NDBT_Stats {
public:
NDBT_Stats() { reset(); }
void reset() { sum = sum2 = 0.0; max = DBL_MIN; ; min = DBL_MAX; n = 0;}
void addObservation(double t) {
sum+= t;
sum2 += (t*t);
n++;
if(min > t) min = t;
if(max < t) max = t;
}
double getMean() const { return sum/n;}
double getStddev() const { return sqrt(getVariance()); }
double getVariance() const { return (n*sum2 - (sum*sum))/(n*n);}
double getMin() const { return min;}
double getMax() const { return max;}
int getCount() const { return n;}
NDBT_Stats & operator+=(const NDBT_Stats & c){
sum += c.sum;
sum2 += c.sum2;
n += c.n;
if(min > c.min) min = c.min;
if(max < c.max) max = c.max;
return * this;
}
private:
double sum;
double sum2;
int n;
double min, max;
};
inline
double
NDB_SQRT(double x){
assert(x >= 0);
double y = 0;
double s = 1;
double r = 0;
while(y <= x){
y += s;
s += 2;
r += 1;
}
return r - 1;
}
#endif
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