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Commons Math example source code file (FastHadamardTransformerTest.java)
The Commons Math FastHadamardTransformerTest.java source code/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.commons.math.transform; import junit.framework.TestCase; /** * JUnit Test for HadamardTransformerTest * @see org.apache.commons.math.transform.FastHadamardTransformer */ public final class FastHadamardTransformerTest extends TestCase { /** * Test of transformer for the a 8-point FHT (means n=8) */ public void test8Points() { checkAllTransforms(new int[] { 1, 4, -2, 3, 0, 1, 4, -1 }, new int[] { 10, -4, 2, -4, 2, -12, 6, 8 }); } /** * Test of transformer for the a 4-points FHT (means n=4) */ public void test4Points() { checkAllTransforms(new int[] { 1, 2, 3, 4 }, new int[] { 10, -2, -4, 0 }); } /** * Test the inverse transform of an integer vector is not always an integer vector */ public void testNoIntInverse() { FastHadamardTransformer transformer = new FastHadamardTransformer(); double[] x = transformer.inversetransform(new double[] { 0, 1, 0, 1}); assertEquals( 0.5, x[0], 0); assertEquals(-0.5, x[1], 0); assertEquals( 0.0, x[2], 0); assertEquals( 0.0, x[3], 0); } /** * Test of transformer for wrong number of points */ public void test3Points() { try { new FastHadamardTransformer().transform(new double[3]); fail("an exception should have been thrown"); } catch (IllegalArgumentException iae) { // expected } } private void checkAllTransforms(int[]x, int[] y) { checkDoubleTransform(x, y); checkInverseDoubleTransform(x, y); checkIntTransform(x, y); } private void checkDoubleTransform(int[]x, int[] y) { // Initiate the transformer FastHadamardTransformer transformer = new FastHadamardTransformer(); // check double transform double[] dX = new double[x.length]; for (int i = 0; i < dX.length; ++i) { dX[i] = x[i]; } double dResult[] = transformer.transform(dX); for (int i = 0; i < dResult.length; i++) { // compare computed results to precomputed results assertEquals((double) y[i], dResult[i]); } } private void checkIntTransform(int[]x, int[] y) { // Initiate the transformer FastHadamardTransformer transformer = new FastHadamardTransformer(); // check integer transform int iResult[] = transformer.transform(x); for (int i = 0; i < iResult.length; i++) { // compare computed results to precomputed results assertEquals(y[i], iResult[i]); } } private void checkInverseDoubleTransform(int[]x, int[] y) { // Initiate the transformer FastHadamardTransformer transformer = new FastHadamardTransformer(); // check double transform double[] dY = new double[y.length]; for (int i = 0; i < dY.length; ++i) { dY[i] = y[i]; } double dResult[] = transformer.inversetransform(dY); for (int i = 0; i < dResult.length; i++) { // compare computed results to precomputed results assertEquals((double) x[i], dResult[i]); } } } Other Commons Math examples (source code examples)Here is a short list of links related to this Commons Math FastHadamardTransformerTest.java source code file: |
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