Revision 6694
trunk/libraries/libIverUtiles/src-test/com/iver/utiles/TestMathExtension.java | ||
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package com.iver.utiles; |
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/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana |
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* |
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* Copyright (C) 2004 IVER T.I. and Generalitat Valenciana. |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version 2 |
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* of the License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA. |
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* |
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* For more information, contact: |
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* |
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* Generalitat Valenciana |
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* Conselleria d'Infraestructures i Transport |
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* Av. Blasco Ib??ez, 50 |
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* 46010 VALENCIA |
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* SPAIN |
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* |
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* +34 963862235 |
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* gvsig@gva.es |
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* www.gvsig.gva.es |
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* |
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* or |
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* |
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* IVER T.I. S.A |
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* Salamanca 50 |
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* 46005 Valencia |
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* Spain |
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* |
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* +34 963163400 |
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* dac@iver.es |
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*/ |
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/** |
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* Tests for the MathExtension class |
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* |
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* @author Pablo Piqueras Bartolom? (p_queras@hotmail.com) |
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*/ |
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public class TestMathExtension { |
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/** |
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* Test method for the TestMathExtension class |
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* |
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* @param args |
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*/ |
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public static void main(String[] args) |
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{ |
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// Test 1 |
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System.out.println("Test 1 -> log2(1)"); |
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showResultState(0, MathExtension.log2(1), 1); |
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|
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// Test 2 |
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System.out.println("Test 2 -> log2(16)"); |
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showResultState(4, MathExtension.log2(16), 2); |
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// Test 3 |
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System.out.println("Test 3 -> log2Integer(15)"); |
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showResultState(3, MathExtension.log2Integer(15), 3); |
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// Test 4 |
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System.out.println("Test 4 -> log2Integer(64)"); |
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showResultState(6, MathExtension.log2Integer(64), 4); |
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// Test 5 |
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System.out.println("Test 5 -> exp2Integer(10)"); |
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showResultState(1024, MathExtension.exp2Integer(10), 5); |
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// Test 6 |
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System.out.println("Test 6 -> exp2(0)"); |
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showResultState(1, MathExtension.exp2(0), 6); |
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// Test 7 |
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System.out.println("Test 7 -> exp2Integer(3.5)"); |
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showResultState(11, MathExtension.exp2Integer(3.5), 7); |
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// Test 8 |
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System.out.println("Test 8 -> logX(e2, e6)"); |
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showResultState(3, MathExtension.logX(Math.pow(Math.E, 2), Math.pow(Math.E, 6)), 8); |
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// Test 9 |
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System.out.println("Test 9 -> logXInteger(5, 137.43)"); |
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showResultState(3, MathExtension.logXInteger(5, 137.43), 9); |
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// Test 10 |
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System.out.println("Test 10 -> expXInteger(3.4, 2.1)"); |
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showResultState(13, MathExtension.expXInteger(3.4, 2.1), 10); |
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// There might be more tests |
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} |
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/** |
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* Indicates if the result of the current test has been successfull or not |
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* |
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* @param correct The correct result |
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* @param result The result of the operation |
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* @param testNumber The numer of the current test |
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*/ |
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private static void showResultState(double correct, double result, int testNumber) { |
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if (correct == result) |
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System.out.println("Test " + testNumber + " OK (Result: " + result + ")"); |
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else |
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System.out.println("Test " + testNumber + " FAILED (Result: " + result + ")"); |
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} |
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} |
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trunk/libraries/libIverUtiles/src/com/iver/utiles/MathExtension.java | ||
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package com.iver.utiles; |
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/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana |
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* |
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* Copyright (C) 2004 IVER T.I. and Generalitat Valenciana. |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version 2 |
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* of the License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA. |
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* |
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* For more information, contact: |
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* |
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* Generalitat Valenciana |
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* Conselleria d'Infraestructures i Transport |
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* Av. Blasco Ib??ez, 50 |
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* 46010 VALENCIA |
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* SPAIN |
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* |
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* +34 963862235 |
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* gvsig@gva.es |
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* www.gvsig.gva.es |
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* |
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* or |
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* |
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* IVER T.I. S.A |
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* Salamanca 50 |
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* 46005 Valencia |
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* Spain |
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* |
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* +34 963163400 |
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* dac@iver.es |
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*/ |
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/** |
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* Some more mathematical functions that 'java.lang.Math' doesn't have |
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* |
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* @author Pablo Piqueras Bartolom? (p_queras@hotmail.com) |
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*/ |
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public final class MathExtension { |
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/** |
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* 2-base logarithm of a |
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* @param a |
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* @return |
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*/ |
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public static double log2(double a) { |
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return (Math.log(a) / Math.log(2)); |
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} |
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/** |
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* 2-base logarithm of a, but the result doesn't have decimals (approximated to the integer number most near by below) |
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* @param a |
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* @return |
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*/ |
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public static int log2Integer(double a) { |
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return (int) Math.floor(log2(a)); |
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} |
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/** |
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* 2 raised to the power a |
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* @param a |
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* @return |
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*/ |
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public static double exp2(double a) { |
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return (Math.exp(a * Math.log(2))); |
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} |
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/** |
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* 2 raised to the power a, but the result doesn't have decimals (approximated to the integer number most near by below) |
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* @param a |
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* @return |
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*/ |
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public static int exp2Integer(double a) { |
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return (int) Math.floor(exp2(a)); |
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} |
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/** |
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* X-base logarithm of a |
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* @param a |
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* @return |
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*/ |
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public static double logX(double x_base, double a) { |
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return (Math.log(a) / Math.log(x_base)); |
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} |
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/** |
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* X-base logarithm of a, but the result doesn't have decimals (approximated to the integer number most near by below) |
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* @param a |
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* @return |
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*/ |
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public static int logXInteger(double x_base, double a) { |
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return (int) Math.floor(logX(x_base, a)); |
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} |
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/** |
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* X raised to the power a |
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* @param a |
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* @return |
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*/ |
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public static double expX(double x, double a) { |
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return (Math.exp(a * Math.log(x))); |
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} |
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/** |
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* X raised to the power a, but the result doesn't have decimals (approximated to the integer number most near by below) |
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* @param a |
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* @return |
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*/ |
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public static int expXInteger(double x, double a) { |
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return (int) Math.floor(expX(x, a)); |
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} |
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} |
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