001 // --- BEGIN LICENSE BLOCK --- 002 /* 003 * Copyright (c) 2009, Mikio L. Braun 004 * All rights reserved. 005 * 006 * Redistribution and use in source and binary forms, with or without 007 * modification, are permitted provided that the following conditions are 008 * met: 009 * 010 * * Redistributions of source code must retain the above copyright 011 * notice, this list of conditions and the following disclaimer. 012 * 013 * * Redistributions in binary form must reproduce the above 014 * copyright notice, this list of conditions and the following 015 * disclaimer in the documentation and/or other materials provided 016 * with the distribution. 017 * 018 * * Neither the name of the Technische Universit??t Berlin nor the 019 * names of its contributors may be used to endorse or promote 020 * products derived from this software without specific prior 021 * written permission. 022 * 023 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 024 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 025 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 026 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 027 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 028 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 029 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 030 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 031 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 032 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 033 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 034 */ 035 // --- END LICENSE BLOCK --- 036 037 /* 038 * To change this template, choose Tools | Templates 039 * and open the template in the editor. 040 */ 041 042 package org.jblas.la.ranges; 043 044 import org.jblas.la.*; 045 import org.jblas.la.ranges.IndicesRange; 046 import org.jblas.la.ranges.AllRange; 047 048 /** 049 * A bunch of static functions for making construction of ranges more 050 * uniform. Basically, we have 051 * <ul> 052 * <li>point(3) - a PointRange. 053 * <li>indices(new int[] {1,2,3,...}) - a Indices Range. 054 * <li>interval(1, 2) - an interval range. 055 * <li>all() - an AllRange. 056 * <li>indices(x) - with a DoubleMatrix. 057 * <li>find(x) - an index constructed from the non-zero elements of x. 058 * </ul> 059 * 060 */ 061 public class RangeUtils { 062 /** Construct point range (constant range) with given index. */ 063 public static Range point(int i) { 064 return new PointRange(i); 065 } 066 067 public static Range indices(int[] is) { 068 return new IndicesRange(is); 069 } 070 071 public static Range interval(int a, int b) { 072 return new IntervalRange(a, b); 073 } 074 075 public static Range all() { 076 return new AllRange(); 077 } 078 079 public static Range indices(DoubleMatrix is) { 080 return new IndicesRange(is); 081 } 082 083 public static Range find(DoubleMatrix is) { 084 return new IndicesRange(is.findIndices()); 085 } 086 }