smplhist.cc

早期freebsd实现

// This may look like C code, but it is really -*- C++ -*-
/* 
Copyright (C) 1988 Free Software Foundation
    written by Dirk Grunwald ([e-mail])

This file is part of the GNU C++ Library.  This library is free
software; you can redistribute it and/or modify it under the terms of
the GNU Library General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.  This library 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 Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifdef __GNUG__
#pragma implementation
#endif
#include <stream.h>
#include <SmplHist.h>
#include <math.h>

#ifndef HUGE_VAL
#ifdef HUGE
#define HUGE_VAL HUGE
#else
#include <float.h>
#define HUGE_VAL DBL_MAX
#endif
#endif

const int SampleHistogramMinimum = -2;
const int SampleHistogramMaximum = -1;

SampleHistogram::SampleHistogram(double low, double high, double width)
{
    if (high < low) {
	double t = high;
	high = low;
	low = t;
    }

    if (width == -1) {
	width = (high - low) / 10;
    }

    howManyBuckets = int((high - low) / width) + 2;
    bucketCount = new int[howManyBuckets];
    bucketLimit = new double[howManyBuckets];
    double lim = low;
    for (int i = 0; i < howManyBuckets; i++) {
	bucketCount[i] = 0;
	bucketLimit[i] = lim;
	lim += width;
    }
    bucketLimit[howManyBuckets-1] = HUGE_VAL;	/* from math.h */
}

SampleHistogram::~SampleHistogram()
{
    if (howManyBuckets > 0) {
	delete bucketCount;
	delete bucketLimit;
    }
}

void
SampleHistogram::operator+=(double value)
{
    int i;
    for (i = 0; i < howManyBuckets; i++) {
	if (value < bucketLimit[i]) break;
    }
    bucketCount[i]++;
    this->SampleStatistic::operator+=(value);
}

int
SampleHistogram::similarSamples(double d)
{
    int i;
    for (i = 0; i < howManyBuckets; i++) {
	if (d < bucketLimit[i]) return(bucketCount[i]);
    }
    return(0);
}

void
SampleHistogram::printBuckets(ostream& s)
{
    for(int i = 0; i < howManyBuckets; i++) {
	if (bucketLimit[i] >= HUGE_VAL) {
	    s << "< max : " << bucketCount[i] << "\n";
	} else {
	    s << "< " << bucketLimit[i] << " : " << bucketCount[i] << "\n";
	}
    }
}

void
SampleHistogram::reset()
{
    this->SampleStatistic::reset();
    if (howManyBuckets > 0) {
	for (register int i = 0; i < howManyBuckets; i++) {
	    bucketCount[i] = 0;
	}
    }
}