/*
* Encog(tm) Core v3.4 - Java Version
* http://www.heatonresearch.com/encog/
* https://github.com/encog/encog-java-core
* Copyright 2008-2016 Heaton Research, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* For more information on Heaton Research copyrights, licenses
* and trademarks visit:
* http://www.heatonresearch.com/copyright
*/
package org.encog.mathutil.randomize;
import java.util.Random;
/**
* A randomizer that will create random weight and bias values that are between
* a specified range.
*
* @author jheaton
*
*/
public class RangeRandomizer extends BasicRandomizer {
/**
* Returns a random number in the range between min and max.
* @param min The minimum desired random number.
* @param max The maximum desired random number.
* @return The random number.
*/
public static int randomInt(final int min, final int max) {
return (int) RangeRandomizer.randomize(min, max + 1);
}
/**
* Generate a random number in the specified range.
*
* @param min
* The minimum value.
* @param max
* The maximum value.
* @return A random number.
*/
public static double randomize(final double min, final double max) {
final double range = max - min;
return (range * Math.random()) + min;
}
public static double randomize(final Random r, final double min, final double max) {
final double range = max - min;
return (range * r.nextDouble()) + min;
}
/**
* The minimum value for the random range.
*/
private final double min;
/**
* The maximum value for the random range.
*/
private final double max;
/**
* Construct a range randomizer.
*
* @param min
* The minimum random value.
* @param max
* The maximum random value.
*/
public RangeRandomizer(final double min, final double max) {
this.max = max;
this.min = min;
}
/**
* Generate a random number based on the range specified in the constructor.
*
* @param d
* The range randomizer ignores this value.
* @return The random number.
*/
public double randomize(final double d) {
return nextDouble(this.min, this.max);
}
/**
* @return the min
*/
public double getMin() {
return min;
}
/**
* @return the max
*/
public double getMax() {
return max;
}
}