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.general.statistical; 025 026 import org.ujmp.core.Matrix; 027 import org.ujmp.core.doublematrix.calculation.AbstractDoubleCalculation; 028 import org.ujmp.core.exceptions.MatrixException; 029 030 public class IndexOfMax extends AbstractDoubleCalculation { 031 private static final long serialVersionUID = 2656643557116576004L; 032 033 public IndexOfMax(int dimension, Matrix matrix) { 034 super(dimension, matrix); 035 } 036 037 038 public double getDouble(long... coordinates) throws MatrixException { 039 double max = -Double.MAX_VALUE; 040 long index = -1; 041 switch (getDimension()) { 042 case ROW: 043 for (long r = getSource().getSize()[ROW] - 1; r != -1; r--) { 044 double v = getSource().getAsDouble(r, coordinates[COLUMN]); 045 if (v > max) { 046 max = v; 047 index = r; 048 } 049 } 050 return index; 051 case COLUMN: 052 for (long c = getSource().getSize()[COLUMN] - 1; c != -1; c--) { 053 double v = getSource().getAsDouble(coordinates[ROW], c); 054 if (v > max) { 055 max = v; 056 index = c; 057 } 058 } 059 return index; 060 } 061 return 0.0; 062 } 063 064 065 public long[] getSize() { 066 switch (getDimension()) { 067 case ROW: 068 return new long[] { 1, getSource().getSize()[COLUMN] }; 069 case COLUMN: 070 return new long[] { getSource().getSize()[ROW], 1 }; 071 } 072 return null; 073 } 074 075 }