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TestEntropy.h

Go to the documentation of this file.

#ifndef Impala_Core_Histogram_Test_TestEntropy_h
#define Impala_Core_Histogram_Test_TestEntropy_h

#include <cppunit/extensions/HelperMacros.h>
#include <algorithm>

#include "Core/Histogram/Entropy.h"

namespace Impala
{
namespace Core
{
namespace Histogram
{

class TestEntropy : public CPPUNIT_NS::TestFixture
{
    CPPUNIT_TEST_SUITE(TestEntropy);
    CPPUNIT_TEST(testZeroPadding);
    CPPUNIT_TEST(testScaling);  
    CPPUNIT_TEST(testKnownValues);
    CPPUNIT_TEST_SUITE_END();
    
public:

    void
    setUp()
    {
    }

    void
    tearDown()
    {
    }

    void
    testZeroPadding()
    {
        int data[3] = {1, 2, 3};
        int dataPadded[7] = {1, 2, 3, 0, 0, 0 ,0};
        Histogram1dTem<int> hist(0, 1, 3, 0, data);
        Histogram1dTem<int> histPadded(0, 1, 7, 0, dataPadded);
        CPPUNIT_ASSERT_EQUAL(Entropy(&hist), Entropy(&histPadded));
    }
    
    void
    testScaling()
    {
        int data1[4] = {1, 2, 3, 4};
        int data2[4] = {10, 20, 30, 40};
        Histogram1dTem<int> hist1(0, 1, 4, 0, data1);
        Histogram1dTem<int> hist2(0, 1, 4, 0, data2);
        CPPUNIT_ASSERT_EQUAL(Entropy(&hist1), Entropy(&hist2));
    }
    
    void
    testKnownValues()
    {
        int data1[1] = {1};
        int data2[2] = {1, 1};
        int data4[4] = {1, 1, 1, 1};
        int data8[8] = {1, 1, 1, 1, 1, 1, 1, 1};
        int data1234[4] = {1, 2, 3, 4};
        int data13258[5] = {1, 3, 2, 5, 8};
        Histogram1dTem<int> hist1(0, 1, 1, 0, data1);
        Histogram1dTem<int> hist2(0, 1, 2, 0, data2);
        Histogram1dTem<int> hist4(0, 1, 4, 0, data4);
        Histogram1dTem<int> hist8(0, 1, 8, 0, data8);
        Histogram1dTem<int> hist1234(0, 1, 4, 0, data1234);
        Histogram1dTem<int> hist13258(0, 1, 5, 0, data13258);
        CPPUNIT_ASSERT_EQUAL(0., Entropy(&hist1));
        CPPUNIT_ASSERT_EQUAL(1., Entropy(&hist2));
        CPPUNIT_ASSERT_EQUAL(2., Entropy(&hist4));
        CPPUNIT_ASSERT_EQUAL(3., Entropy(&hist8));
        ILOG_DEBUG("\n1.8464: "<< Entropy(&hist1234));
        ILOG_DEBUG("\n2.0182: "<< Entropy(&hist13258));
    }
    
private:
    ILOG_CLASS;
};

ILOG_CLASS_INIT(TestEntropy, Impala.Core.Histogram);

CPPUNIT_TEST_SUITE_REGISTRATION( TestEntropy );
    
} // namespace
} // namespace
} // namespace

#endif
    

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