[MERGE] - took nice new histogram class from branch rfrohl in default

src/dataHandler/WDataSetScalar.cpp

@@ -43,17 +43,16 @@ WDataSetScalar::WDataSetScalar( boost::shared_ptr< WValueSetBase > newValueSet,
     WAssert( newValueSet->size() == newGrid->size(), "Number of values unequal number of positions in grid." );
     WAssert( newValueSet->order() == 0, "The value set does not contain scalars." );
 
-    double max = wlimits::MIN_DOUBLE;
-    double min = wlimits::MAX_DOUBLE;
-
-    for( size_t i = 0; i < newValueSet->size(); ++i )
-    {
-        double tmp = newValueSet->getScalarDouble( i );
-        max = max < tmp ? tmp : max;
-        min = min > tmp ? tmp : min;
-    }
-    m_maximum = max;
-    m_minimum = min;
+    m_histogram = boost::shared_ptr< WHistogram >( new WHistogram( newValueSet ) );
+    m_maximum = m_histogram->getMax();
+    m_minimum = m_histogram->getMin();
+
+    // TEST
+    //boost::shared_ptr< WHistogram > hist( new WHistogram( *m_histogram, 15 ) );
+    //m_histogram->setInterval( 20.0 );
+    //m_histogram->test();
+    //hist->setInterval( 15.0 );
+    //hist->test();
 }
 
 WDataSetScalar::WDataSetScalar()
@@ -74,6 +73,8 @@ WDataSetScalar::WDataSetScalar( boost::shared_ptr< WValueSetBase > newValueSet,
     WAssert( newValueSet->order() == 0, "The value set does not contain scalars." );
 
     WAssert( max >= min, "max must be at least as large as min." );
+    // TODO(ebaum, rfrohl): WHistogram calculates min/max, change constructor
+    m_histogram = boost::shared_ptr< WHistogram >( new WHistogram( newValueSet ) );
     m_maximum = max;
     m_minimum = min;
 }
@@ -84,11 +85,13 @@ WDataSetScalar::~WDataSetScalar()
 
 double WDataSetScalar::getMax() const
 {
+    //change to whistogram->getMax()?
     return m_maximum;
 }
 
 double WDataSetScalar::getMin() const
 {
+    //change to whistogram->getMin()?
     return m_minimum;
 }
 

src/dataHandler/WDataSetScalar.h

@@ -25,6 +25,8 @@
 #ifndef WDATASETSCALAR_H
 #define WDATASETSCALAR_H
 
+#include "datastructures/WHistogram.h"
+
 #include "WDataSetSingle.h"
 
 /**
@@ -127,6 +129,11 @@ protected:
 private:
     double m_maximum; //!< Largest scalar of data set.
     double m_minimum; //!< Smallest scalar of data set.
+
+    /**
+     * The histogram for later use.
+     **/
+    boost::shared_ptr< WHistogram > m_histogram;
 };
 
 template< typename T > T WDataSetScalar::getValueAt( int x, int y, int z ) const

src/dataHandler/datastructures/WValueSetHistogram.cpp

+//---------------------------------------------------------------------------
+//
+// Project: OpenWalnut ( http://www.openwalnut.org )
+//
+// Copyright 2009 OpenWalnut Community, BSV@Uni-Leipzig and CNCF@MPI-CBS
+// For more information see http://www.openwalnut.org/copying
+//
+// This file is part of OpenWalnut.
+//
+// OpenWalnut is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// OpenWalnut is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with OpenWalnut. If not, see <http://www.gnu.org/licenses/>.
+//
+//---------------------------------------------------------------------------
+
+#include <cstring> // memset()
+
+#include "../../common/WAssert.h"
+#include "../../common/WLimits.h"
+
+#include "WValueSetHistogram.h"
+
+WValueSetHistogram::WValueSetHistogram( boost::shared_ptr< WValueSetBase > valueSet )
+{
+    // calculate min max
+    m_minimum = wlimits::MAX_DOUBLE;
+    m_maximum = wlimits::MIN_DOUBLE;
+    double minDistance = wlimits::MAX_DOUBLE;
+    for( size_t i = 0; i != valueSet->size(); ++i )
+    {
+        double tmp = valueSet->getScalarDouble( i );
+        m_maximum = m_maximum < tmp ? tmp : m_maximum;
+        m_minimum = m_minimum > tmp ? tmp : m_minimum;
+
+        if( m_minimum != tmp && m_minimum != wlimits::MAX_DOUBLE )
+        {
+            minDistance = tmp - m_minimum < minDistance ? tmp - m_minimum : minDistance;
+        }
+        if( m_maximum != tmp && m_maximum != wlimits::MIN_DOUBLE )
+        {
+            minDistance = m_maximum - tmp < minDistance ? m_maximum - tmp : minDistance;
+        }
+    }
+
+    // create base histogram
+    m_nInitialBuckets = ( ( m_maximum - m_minimum ) / minDistance ) + 1;
+    m_bucketSize = minDistance;
+    unsigned int* initialBuckets = new unsigned int[m_nInitialBuckets];
+    // initialize array to zero
+    memset( initialBuckets, 0, m_nInitialBuckets * sizeof( unsigned int ) );
+    //*initialBuckets = { 0 }; // this should works with C++0x (instead memset), TEST IT!
+    m_initialBuckets = boost::shared_array< unsigned int >( initialBuckets );
+
+    m_nMappedBuckets = 0;
+
+    for( size_t i = 0; i < valueSet->size(); ++i )
+    {
+        double tmp = valueSet->getScalarDouble( i );
+        increment( tmp );
+    }
+}
+
+WValueSetHistogram::WValueSetHistogram( const WValueSetBase& valueSet )
+{
+    // calculate min max
+    m_minimum = wlimits::MAX_DOUBLE;
+    m_maximum = wlimits::MIN_DOUBLE;
+    double minDistance = wlimits::MAX_DOUBLE;
+    for( size_t i = 0; i != valueSet.size(); ++i )
+    {
+        double tmp = valueSet.getScalarDouble( i );
+        m_maximum = m_maximum < tmp ? tmp : m_maximum;
+        m_minimum = m_minimum > tmp ? tmp : m_minimum;
+
+        if( m_minimum != tmp && m_minimum != wlimits::MAX_DOUBLE )
+        {
+            minDistance = tmp - m_minimum < minDistance ? tmp - m_minimum : minDistance;
+        }
+        if( m_maximum != tmp && m_maximum != wlimits::MIN_DOUBLE )
+        {
+            minDistance = m_maximum - tmp < minDistance ? m_maximum - tmp : minDistance;
+        }
+    }
+
+    // create base histogram
+    m_nInitialBuckets = ( ( m_maximum - m_minimum ) / minDistance ) + 1;
+    m_bucketSize = minDistance;
+    unsigned int* initialBuckets = new unsigned int[m_nInitialBuckets];
+    // initialize array to zero
+    memset( initialBuckets, 0, m_nInitialBuckets * sizeof( unsigned int ) );
+    //*initialBuckets = { 0 }; // this should works with C++0x (instead memset), TEST IT!
+    m_initialBuckets = boost::shared_array< unsigned int >( initialBuckets );
+
+    m_nMappedBuckets = 0;
+
+    for( size_t i = 0; i < valueSet.size(); ++i )
+    {
+        double tmp = valueSet.getScalarDouble( i );
+        increment( tmp );
+    }
+}
+
+WValueSetHistogram::WValueSetHistogram( const WValueSetHistogram& histogram, double intervalSize )
+{
+    // copy constructor
+    m_nInitialBuckets = histogram.getNInitialBuckets();
+    m_initialBuckets = boost::shared_array< unsigned int >( histogram.getInitialBuckets() );
+    m_bucketSize = histogram.getBucketSize();
+
+    m_nMappedBuckets = 0;
+
+    m_minimum = histogram.getMin();
+    m_maximum = histogram.getMax();
+
+    if( intervalSize != 0.0 )
+    {
+        WAssert( intervalSize > 0.0, "WValueSetHistogram::WValueSetHistogram : intervalSize has to be greater then zero." );
+        calculateMapping( intervalSize );
+    }
+}
+
+WValueSetHistogram::~WValueSetHistogram()
+{
+}
+
+boost::shared_array< unsigned int > WValueSetHistogram::getInitialBuckets() const
+{
+    return m_initialBuckets;
+}
+
+unsigned int WValueSetHistogram::getNInitialBuckets() const
+{
+    return m_nInitialBuckets;
+}
+
+double WValueSetHistogram::getBucketSize() const
+{
+    return m_bucketSize;
+}
+
+void WValueSetHistogram::increment( double value )
+{
+    WAssert( m_bucketSize > 0.0, "WValueSetHistogram::increment() : m_bucketSize to small." );
+    unsigned int index = static_cast<unsigned int>( value / m_bucketSize );
+    m_initialBuckets[index]++;
+}
+
+unsigned int WValueSetHistogram::setInterval( double intervalSize )
+{
+    if( m_bucketSize == intervalSize )
+    {
+        if( m_mappedBuckets )
+        {
+            m_mappedBuckets.reset();
+            m_nMappedBuckets = 0;
+        }
+    }
+    else
+    {
+        calculateMapping( intervalSize );
+    }
+    return m_nMappedBuckets;
+}
+
+void WValueSetHistogram::calculateMapping( double intervalSize )
+{
+    unsigned int ratio = static_cast<unsigned int>( intervalSize / m_bucketSize );
+    WAssert( ratio > 1, "WValueSetHistogram::calculateMapping() : intervalSize has to be greater then the original size." );
+    // number of elements in the new mapped histogram = division + (round up)
+    m_nMappedBuckets = m_nInitialBuckets / ratio + ( m_nInitialBuckets % ratio > 0 ? 1 : 0 );
+
+    if( m_mappedBuckets )
+    {
+        m_mappedBuckets.reset();
+    }
+
+    unsigned int* mappedBuckets = new unsigned int[m_nMappedBuckets];
+    memset( mappedBuckets, 0, m_nMappedBuckets * sizeof( unsigned int ) );
+    //*mappedBuckets = { 0 }; // works with C++0x
+    boost::scoped_array< unsigned int > scoped( mappedBuckets );
+    m_mappedBuckets.swap( scoped );
+    unsigned int index = 0;
+    for( unsigned int i = 0; i != m_nInitialBuckets; ++i )
+    {
+        if( i % ratio == 0 && i != 0 )
+        {
+            index++;
+        }
+        m_mappedBuckets[index] += m_initialBuckets[i];
+    }
+}
+
+unsigned int WValueSetHistogram::operator[]( unsigned int index )
+{
+    unsigned int value = 0;
+    if( m_mappedBuckets )
+    {
+        index = m_mappedBuckets[index];
+    }
+    else
+    {
+        value = m_initialBuckets[index];
+    }
+    return value;
+}
+
+unsigned int WValueSetHistogram::at( unsigned int index )
+{
+    unsigned int value = 0;
+    if( m_mappedBuckets )
+    {
+        WAssert( index < m_nMappedBuckets, "WValueSetHistogram::at() : index out of range." );
+        value = m_mappedBuckets[index];
+    }
+    else
+    {
+        WAssert( index < m_nInitialBuckets, "WValueSetHistogram::at() : index out of range." );
+        value = m_initialBuckets[index];
+    }
+    return value;
+}
+
+unsigned int WValueSetHistogram::size() const
+{
+    return (m_mappedBuckets ? m_nMappedBuckets : m_nInitialBuckets);
+}
+
+double WValueSetHistogram::getMin() const
+{
+    return m_minimum;
+}
+
+double WValueSetHistogram::getMax() const
+{
+    return m_maximum;
+}
+

src/dataHandler/datastructures/WValueSetHistogram.h

+//---------------------------------------------------------------------------
+//
+// Project: OpenWalnut ( http://www.openwalnut.org )
+//
+// Copyright 2009 OpenWalnut Community, BSV@Uni-Leipzig and CNCF@MPI-CBS
+// For more information see http://www.openwalnut.org/copying
+//
+// This file is part of OpenWalnut.
+//
+// OpenWalnut is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// OpenWalnut is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with OpenWalnut. If not, see <http://www.gnu.org/licenses/>.
+//
+//---------------------------------------------------------------------------
+
+#ifndef WVALUESETHISTOGRAM_H
+#define WVALUESETHISTOGRAM_H
+
+#include <map>
+#include <list>
+#include <utility>
+
+#include <boost/shared_ptr.hpp>
+#include <boost/scoped_array.hpp>
+#include <boost/shared_array.hpp>
+
+#include "../WValueSet.h"
+
+/**
+ * Used to find the occurrence frequencies of values in a value set. It implements a classical histogram but allows easy modification of bucket
+ * sizes without unnecessary recalculation of the whole histogram.
+ *
+ * \note This histogram is different from from WValueSetHistogram which is a generic histogram class.
+ */
+class WValueSetHistogram
+{
+public:
+    /**
+     * Constructor. Creates the histogram for the specified value set.
+     *
+     * \param valueSet source of the data for the histogram
+     */
+    explicit WValueSetHistogram( boost::shared_ptr< WValueSetBase > valueSet );
+
+
+    /**
+     * Constructor. Creates the histogram for the specified value set.
+     *
+     * \param valueSet source of the data for the histogram
+     */
+    explicit WValueSetHistogram( const WValueSetBase& valueSet );
+
+    /**
+     * Copy constructor. If another interval size is given setInterval() is called and
+     * the mapped histogram is calculated.
+     *
+     * \param histogram another WValueSetHistogram
+     * \param intervalSize the size of one bucket in the mapped histogram
+     */
+    explicit WValueSetHistogram( const WValueSetHistogram& histogram, double intervalSize = 0.0 );
+
+    /**
+     * Destructor.
+     */
+    ~WValueSetHistogram();
+
+    /**
+     * Set the new interval size.
+     *
+     * \param intervalSize size of the interval for each mapped bucket.
+     *
+     * \return size of the new (mapped) histogram.
+     */
+    unsigned int setInterval( double intervalSize );
+
+    /**
+     * Get the size of the bucket.
+     *
+     * \param index which buckets size is to be returned, starts with 0 which is the bucket
+     * containing the smallest values.
+     *
+     * \return elements in the bucket.
+     */
+    unsigned int operator[]( unsigned int index );
+
+    /**
+     * Get the size of the bucket. Testing if the position is valid.
+     *
+     * \param index which buckets size is to be returned, starts with 0 which is the bar with
+     * the smallest values
+     *
+     * \return elements in the bucket
+     */
+    unsigned int at( unsigned int index );
+
+    /**
+     * Returns the number of bars in the histogram with the actual mapping.
+     *
+     * \return number of buckets
+     */
+    unsigned int size() const;
+
+    /**
+     * Returns the minimum value in the value set.
+     *
+     * \return minimum
+     */
+    double getMin() const;
+
+    /**
+     * Returns the maximum value in the value set.
+     *
+     * \return maximum
+     */
+    double getMax() const;
+
+protected:
+    /**
+     * Return the initial buckets.
+     *
+     * \return m_initialBuckets
+     */
+    boost::shared_array< unsigned int > getInitialBuckets() const;
+
+    /**
+     * Return the number of initial buckets.
+     *
+     * \return m_nInitialBuckets
+     */
+    unsigned int getNInitialBuckets() const;
+
+    /**
+     * Return the size of one initial bucket.
+     *
+     * \return m_bucketSize
+     */
+    double getBucketSize() const;
+
+private:
+    /**
+     * The smallest value in the ValueSet
+     */
+    double m_minimum;
+
+    /**
+     * The biggest value in the ValueSet
+     */
+    double m_maximum;
+
+    /**
+     * Size of one bucket in the initial histogram.
+     */
+    double m_bucketSize;
+
+    /**
+     * Pointer to all initial buckets of the histogram.
+     */
+    boost::shared_array< unsigned int > m_initialBuckets;
+
+    /**
+     * Number of buckets in the initial histogram.
+     */
+    unsigned int m_nInitialBuckets;
+
+    /**
+     * Pointer to all the buckets in the mapped histogram.
+     */
+    boost::scoped_array< unsigned int > m_mappedBuckets;
+
+    /**
+     * Tracks the number of a buckets in the mapped histogram.
+     */
+    unsigned int m_nMappedBuckets;
+
+    /**
+     * To calculate the new buckets
+     *
+     * \param intervalSize the size of one bucket
+     */
+    void calculateMapping( double intervalSize );
+
+    /**
+     * increment the value by one, contains the logic to find the element place in the array.
+     * Should only be used in the constructor i.e. while iterating over WValueSet.
+     *
+     * \param value value to increment
+     */
+    void increment( double value );
+};
+
+#endif  // WVALUESETHISTOGRAM_H
+

src/dataHandler/datastructures/test/WHistogram_test.h

+//---------------------------------------------------------------------------
+//
+// Project: OpenWalnut ( http://www.openwalnut.org )
+//
+// Copyright 2009 OpenWalnut Community, BSV@Uni-Leipzig and CNCF@MPI-CBS
+// For more information see http://www.openwalnut.org/copying
+//
+// This file is part of OpenWalnut.
+//
+// OpenWalnut is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// OpenWalnut is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with OpenWalnut. If not, see <http://www.gnu.org/licenses/>.
+//
+//---------------------------------------------------------------------------
+
+#ifndef WHISTOGRAM_TEST_H
+#define WHISTOGRAM_TEST_H
+
+//#include <stdint.h>
+#include <vector>
+
+#include <cxxtest/TestSuite.h>
+
+#include "../../WValueSet.h"
+//#include "../../WDataHandlerEnums.h"
+//#include "../../WValueSetBase.h"
+
+#include "../WHistogram.h"
+
+/**
+ * Test WHistogram
+ **/
+class WHistogramTest : public CxxTest::TestSuite
+{
+    public:
+        /**
+         * Test instantiation
+         **/
+        void testInstantiation( void )
+        {
+            double a[2] = { 0.0, 3.1415 };
+            const std::vector< double > v( a, a + sizeof( a ) / sizeof( double ) );
+            WValueSet< double >* valueSet = new WValueSet< double >( 0, 1, v, W_DT_DOUBLE );
+            TS_ASSERT_THROWS_NOTHING( WHistogram hist( *valueSet ) );
+
+            boost::shared_ptr< WValueSet< double > > vsPtr( valueSet );
+            TS_ASSERT_THROWS_NOTHING( WHistogram hist( vsPtr ) );
+        }
+
+        /**
+         * Test operator[]
+         **/
+        void testOperator( void )
+        {
+            double a[4] = { 0.0, 1.0, 1.0, 4.0 };
+            const std::vector< double > v( a, a + sizeof( a ) / sizeof( double ) );
+            WValueSet< double >* valueSet = new WValueSet< double >( 0, 1, v, W_DT_DOUBLE );
+            WHistogram hist( *valueSet );
+            TS_ASSERT_EQUALS( hist[0], 1 ); // 0.0
+            TS_ASSERT_EQUALS( hist[1], 2 ); // 1.0
+            TS_ASSERT_EQUALS( hist[2], 0 ); // 2.0
+            TS_ASSERT_EQUALS( hist[3], 0 ); // 3.0
+            TS_ASSERT_EQUALS( hist[4], 1 ); // 4.0
+        }
+
+        /**
+         * Test at()
+         **/
+        void testAt( void )
+        {
+            double a[4] = { 0.0, 1.0, 1.0, 4.0 };
+            const std::vector< double > v( a, a + sizeof( a ) / sizeof( double ) );
+            WValueSet< double >* valueSet = new WValueSet< double >( 0, 1, v, W_DT_DOUBLE );
+            WHistogram hist( *valueSet );
+            TS_ASSERT_EQUALS( hist.at( 0 ), 1 ); // 0.0
+            TS_ASSERT_EQUALS( hist.at( 1 ), 2 ); // 1.0
+            TS_ASSERT_EQUALS( hist.at( 2 ), 0 ); // 2.0
+            TS_ASSERT_EQUALS( hist.at( 3 ), 0 ); // 3.0
+            TS_ASSERT_EQUALS( hist.at( 4 ), 1 ); // 4.0