integrator.h

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/* -*-  Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
 * Copyright (c) 1997 Regents of the University of California.
 * All rights reserved.
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 *  This product includes software developed by the MASH Research
 *  Group at the University of California Berkeley.
 * 4. Neither the name of the University nor of the Research Group may be
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 * @(#) $Header: /nfs/jade/vint/CVSROOT/ns-2/tools/integrator.h,v 1.9 1999/09/28 03:46:29 heideman Exp $ (LBL)
 */

#ifndef ns_integrator_h
#define ns_integrator_h

#include "config.h"

class Integrator : public TclObject {
public:
    Integrator();
    void set(double x, double y);
    void newPoint(double x, double y);
    int command(int argc, const char*const* argv);
protected:
    double lastx_;
    double lasty_;
    double sum_;
};

// a set of statistical samples
class Samples : public TclObject {
public:
    Samples() : cnt_(0), sum_(0.0), sqsum_(0.0) { }
    void newPoint(double val) {
        cnt_++;
        sum_ += val;
        val *= val;
        sqsum_ += val;
    }
    int cnt() const { return (cnt_); }
    double sum() const { return (sum_); }
    double mean() const {
        if (cnt_)
            return (sum_ / cnt_);
        return sum_; // yes, that is 0.0...
    }
    double variance() const {
        // use cnt_-1 degrees of freedom
        if (cnt_ > 1)
            return ((sqsum_ - mean() * sum_) / (cnt_ - 1));
        return 0.0;
    }
    void reset() { cnt_ = 0; sum_ = sqsum_ = 0.0; }
    int command(int argc, const char*const* argv);
protected:
    int cnt_;   // count of samples
    double  sum_;   // sum of x_i
    double  sqsum_; // sum of (x_i)^2
};
#endif

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