Here you can find the source of toDoubleArray(int... intArray)
public static double[] toDoubleArray(int... intArray)
//package com.java2s; /*//from w ww . j a v a 2s. co m * Copyright (C) 2008-2015 by Holger Arndt * * This file is part of the Universal Java Matrix Package (UJMP). * See the NOTICE file distributed with this work for additional * information regarding copyright ownership and licensing. * * UJMP is free software; you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * UJMP 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with UJMP; if not, write to the * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301 USA */ public class Main { public static double[] toDoubleArray(int... intArray) { int nmb = intArray.length; double[] ret = new double[nmb]; for (int i = 0; i < nmb; i++) ret[i] = intArray[i]; return ret; } public static double[][] toDoubleArray(int[]... intArray) { int rows = intArray.length; if (rows <= 0) return new double[0][0]; int cols = intArray[0].length; double[][] ret = new double[rows][cols]; for (int i = rows - 1; i >= 0; i--) { for (int j = cols - 1; j >= 0; j--) { ret[i][j] = intArray[i][j]; } } return ret; } }