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package de.lmu.ifi.dbs.elki.math;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2011
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.util.Collection;
import de.lmu.ifi.dbs.elki.utilities.pairs.DoubleDoublePair;
/**
* Class to find the minimum and maximum double values in data.
*
* @author Erich Schubert
*/
public class DoubleMinMax extends DoubleDoublePair {
/**
* Constructor without starting values.
*
* The minimum will be initialized to {@link Double#POSITIVE_INFINITY}.
*
* The maximum will be initialized to {@link Double#NEGATIVE_INFINITY}.
*
* So that the first data added will replace both.
*/
public DoubleMinMax() {
super(Double.POSITIVE_INFINITY, Double.NEGATIVE_INFINITY);
}
/**
* Constructor with predefined minimum and maximum values.
*
* @param min Minimum value
* @param max Maximum value
*/
public DoubleMinMax(double min, double max) {
super(min, max);
}
/**
* Process a single double value.
*
* If the new value is smaller than the current minimum, it will become the
* new minimum.
*
* If the new value is larger than the current maximum, it will become the new
* maximum.
*
* @param data New value
*/
public void put(double data) {
this.first = Math.min(this.first, data);
this.second = Math.max(this.second, data);
}
/**
* Process a whole array of double values.
*
* If any of the values is smaller than the current minimum, it will become
* the new minimum.
*
* If any of the values is larger than the current maximum, it will become the
* new maximum.
*
* @param data Data to process
*/
public void put(double[] data) {
for(double value : data) {
this.put(value);
}
}
/**
* Process a whole collection of double values.
*
* If any of the values is smaller than the current minimum, it will become
* the new minimum.
*
* If any of the values is larger than the current maximum, it will become the
* new maximum.
*
* @param data Data to process
*/
public void put(Collection<Double> data) {
for(Double value : data) {
this.put(value);
}
}
/**
* Get the current minimum.
*
* @return current minimum.
*/
public double getMin() {
return this.first;
}
/**
* Get the current maximum.
*
* @return current maximum.
*/
public double getMax() {
return this.second;
}
/**
* Return the difference between minimum and maximum.
*
* @return Difference of current Minimum and Maximum.
*/
public double getDiff() {
return this.getMax() - this.getMin();
}
/**
* Test whether the result is defined.
*
* @return true when at least one value has been added
*/
public boolean isValid() {
return (first <= second);
}
/**
* Return minimum and maximum as array.
*
* @return Minimum, Maximum
*/
public double[] asDoubleArray() {
return new double[] { this.getMin(), this.getMax() };
}
/**
* Generate a new array of initialized DoubleMinMax objects (with default
* constructor)
*
* @param size Array size
* @return initialized array
*/
public static DoubleMinMax[] newArray(int size) {
DoubleMinMax ret[] = new DoubleMinMax[size];
for(int i = 0; i < size; i++) {
ret[i] = new DoubleMinMax();
}
return ret;
}
}
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