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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.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* 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
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#) $Header: /cvsroot/nsnam/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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