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