histogram.h

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/* $Id: histogram.h,v 1.1 2006-08-09 15:20:54 jonathan Exp $
* Jonathan Ledlie, Harvard University.
* Copyright 2006.  All rights reserved.
*/

#ifndef HISTOGRAM_H
#define HISTOGRAM_H

#include <math.h>
#include <iostream>
#include <vector>
#include <map>
#include "error.h"
using namespace::std;

class Histogram 
{
	friend ostream& operator << (ostream& os, Histogram* h);
private:
	int size;
	double sum;
	// TODO some kind of sorted list would be better
	vector<double> values;
	map<double,int> value2count;
	void add (double value, int count, bool doCoerce);
	double findBucket (double value);

public:
	const double bucketWidth;
	Histogram (double bw) : bucketWidth(bw) { size = 0; sum = 0;}
	void add (Histogram *);
	void add (double value, int count) { add (value, count, true); }
	void add (double value) { add (value, 1); }
	void add (int value) { add ((double)value,1); }
	void add (int value, int count) { add ((double)value,count); }
	void clear () { value2count.clear(); size = 0; values.clear(); }
	double mean ();
	double percentile (double pct);
};

#endif