001 /* 002 * Copyright (C) 2008-2010 by Holger Arndt 003 * 004 * This file is part of the Universal Java Matrix Package (UJMP). 005 * See the NOTICE file distributed with this work for additional 006 * information regarding copyright ownership and licensing. 007 * 008 * UJMP is free software; you can redistribute it and/or modify 009 * it under the terms of the GNU Lesser General Public License as 010 * published by the Free Software Foundation; either version 2 011 * of the License, or (at your option) any later version. 012 * 013 * UJMP is distributed in the hope that it will be useful, 014 * but WITHOUT ANY WARRANTY; without even the implied warranty of 015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 016 * GNU Lesser General Public License for more details. 017 * 018 * You should have received a copy of the GNU Lesser General Public 019 * License along with UJMP; if not, write to the 020 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, 021 * Boston, MA 02110-1301 USA 022 */ 023 024 package org.ujmp.core.doublematrix.calculation.entrywise.creators; 025 026 import org.ujmp.core.Matrix; 027 import org.ujmp.core.MatrixFactory; 028 import org.ujmp.core.doublematrix.calculation.AbstractDoubleCalculation; 029 import org.ujmp.core.enums.ValueType; 030 import org.ujmp.core.exceptions.MatrixException; 031 import org.ujmp.core.util.MathUtil; 032 033 public class Rand extends AbstractDoubleCalculation { 034 private static final long serialVersionUID = 1482175899706574542L; 035 036 private double min = 0.0; 037 038 private double max = 1.0; 039 040 public Rand(Matrix matrix) { 041 super(matrix); 042 } 043 044 public Rand(Matrix matrix, double min, double max) { 045 super(matrix); 046 this.min = min; 047 this.max = max; 048 } 049 050 public double getDouble(long... coordinates) { 051 return MathUtil.nextUniform(min, max); 052 } 053 054 public static Matrix calc(long... size) throws MatrixException { 055 return calc(ValueType.DOUBLE, size); 056 } 057 058 public static Matrix calc(Matrix source, double min, double max) throws MatrixException { 059 Matrix ret = Matrix.factory.zeros(source.getSize()); 060 for (long[] c : source.allCoordinates()) { 061 ret.setAsDouble(MathUtil.nextUniform(min, max), c); 062 } 063 return ret; 064 } 065 066 public static Matrix calc(ValueType valueType, long... size) throws MatrixException { 067 Matrix ret = MatrixFactory.zeros(valueType, size); 068 for (long[] c : ret.allCoordinates()) { 069 ret.setAsDouble(MathUtil.nextUniform(0.0, 1.0), c); 070 } 071 return ret; 072 } 073 074 }