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#include "vtkKMeansDistanceFunctor.h"
#include "vtkObjectFactory.h"
#include "vtkDoubleArray.h"
#include "vtkTable.h"
#include "vtkVariantArray.h"
#include "vtkIntArray.h"
#include "vtkIdTypeArray.h"
vtkStandardNewMacro(vtkKMeansDistanceFunctor);
// ----------------------------------------------------------------------
vtkKMeansDistanceFunctor::vtkKMeansDistanceFunctor()
{
this->EmptyTuple = vtkVariantArray::New();
}
// ----------------------------------------------------------------------
vtkKMeansDistanceFunctor::~vtkKMeansDistanceFunctor()
{
this->EmptyTuple->Delete();
}
// ----------------------------------------------------------------------
void vtkKMeansDistanceFunctor::PrintSelf( ostream& os, vtkIndent indent )
{
this->Superclass::PrintSelf( os, indent );
os << indent << "EmptyTuple: " << this->EmptyTuple << "\n";
}
// ----------------------------------------------------------------------
vtkVariantArray* vtkKMeansDistanceFunctor::GetEmptyTuple( vtkIdType dimension )
{
if ( this->EmptyTuple->GetNumberOfValues() != dimension )
{
this->EmptyTuple->SetNumberOfValues( dimension );
for( vtkIdType i = 0; i < dimension; ++ i )
{
this->EmptyTuple->SetValue( i, 0.0 );
}
}
return this->EmptyTuple;
}
// ----------------------------------------------------------------------
void vtkKMeansDistanceFunctor::operator() (
double& distance, vtkVariantArray* clusterCoord, vtkVariantArray* dataCoord )
{
distance = 0.0;
if(clusterCoord->GetNumberOfValues() != dataCoord->GetNumberOfValues() )
{
cout << "The dimensions of the cluster and data do not match." << endl;
distance = -1;
}
for(vtkIdType i = 0; i < clusterCoord->GetNumberOfValues(); i++ )
{
distance += ( clusterCoord->GetValue( i ).ToDouble() - dataCoord->GetValue( i ).ToDouble() ) *
( clusterCoord->GetValue( i ).ToDouble() - dataCoord->GetValue( i ).ToDouble() );
}
}
// ----------------------------------------------------------------------
void vtkKMeansDistanceFunctor::PairwiseUpdate(
vtkTable* clusterCoords, vtkIdType rowIndex, vtkVariantArray* dataCoord,
vtkIdType dataCoordCardinality, vtkIdType totalCardinality )
{
if ( clusterCoords->GetNumberOfColumns() != dataCoord->GetNumberOfValues() )
{
cout << "The dimensions of the cluster and/or data do not match." << endl;
return;
}
if ( totalCardinality > 0 )
{
for ( vtkIdType i = 0; i < clusterCoords->GetNumberOfColumns(); ++ i )
{
double curCoord = clusterCoords->GetValue( rowIndex, i ).ToDouble();
clusterCoords->SetValue( rowIndex, i,
curCoord + static_cast<double>(dataCoordCardinality)*
(dataCoord->GetValue( i ).ToDouble() - curCoord)/
static_cast<double>( totalCardinality ) );
}
}
}
// ----------------------------------------------------------------------
void vtkKMeansDistanceFunctor::PerturbElement(
vtkTable* newClusterElements, vtkTable* curClusterElements,
vtkIdType changeID, vtkIdType startRunID, vtkIdType endRunID,
double alpha )
{
double numInRange = static_cast<double>( endRunID-startRunID );
vtkIdType dimension = newClusterElements->GetNumberOfColumns();
std::vector<double> perturbedValues( dimension );
for( vtkIdType i = startRunID; i < endRunID; i++)
{
for( vtkIdType j = 0; j < dimension; j++ )
{
if( i == changeID )
{
perturbedValues[j] = alpha*curClusterElements->GetValue( i, j ).ToDouble();
}
else
{
if ( numInRange > 1.0)
{
perturbedValues[j] = ( 1.0-alpha )/( numInRange-1.0 )*
curClusterElements->GetValue( i, j ).ToDouble();
}
else
{
perturbedValues[j] = ( 1.0-alpha )/( numInRange )*
curClusterElements->GetValue( i, j ).ToDouble();
}
}
}
}
}
// ----------------------------------------------------------------------
void* vtkKMeansDistanceFunctor::AllocateElementArray( vtkIdType size )
{
return new double[size];
}
// ----------------------------------------------------------------------
void vtkKMeansDistanceFunctor::DeallocateElementArray( void* array )
{
delete [] static_cast< double* >( array );
}
// ----------------------------------------------------------------------
vtkAbstractArray* vtkKMeansDistanceFunctor::CreateCoordinateArray( )
{
return vtkDoubleArray::New();
}
// ----------------------------------------------------------------------
void vtkKMeansDistanceFunctor::PackElements( vtkTable* curTable, void* vElements )
{
vtkIdType numCols = curTable->GetNumberOfColumns();
vtkIdType numRows = curTable->GetNumberOfRows();
double* localElements = static_cast< double* >( vElements );
for( vtkIdType col = 0; col < numCols; col++ )
{
vtkDoubleArray* doubleArr = vtkArrayDownCast<vtkDoubleArray>( curTable->GetColumn( col ) );
memcpy( &(localElements[col*numRows]), doubleArr->GetPointer( 0 ), numRows*sizeof( double ) );
}
}
// ----------------------------------------------------------------------
void vtkKMeansDistanceFunctor::UnPackElements( vtkTable* curTable, void* vLocalElements, vtkIdType numRows, vtkIdType numCols )
{
double *localElements = static_cast< double* >( vLocalElements );
for ( vtkIdType i = 0; i < numRows; i++ )
{
vtkVariantArray *curRow = vtkVariantArray::New();
for ( int j = 0; j < numCols; j++ )
{
curRow->InsertNextValue( localElements[ j*numRows + i ] );
}
curTable->InsertNextRow( curRow );
curRow->Delete();
}
}
// ----------------------------------------------------------------------
void vtkKMeansDistanceFunctor::UnPackElements( vtkTable* curTable, vtkTable* newTable, void* vLocalElements, void* vGlobalElements, int np )
{
double *globalElements = static_cast< double* >( vGlobalElements );
double *localElements = static_cast< double* >( vLocalElements );
vtkIdType numCols = curTable->GetNumberOfColumns();
vtkIdType numRows = curTable->GetNumberOfRows();
vtkIdType numElements = numCols*numRows;
for( vtkIdType col = 0; col < numCols; col++ )
{
vtkDoubleArray *doubleArr = vtkDoubleArray::New();
doubleArr->SetName( curTable->GetColumnName( col ) );
doubleArr->SetNumberOfComponents( 1 );
doubleArr->SetNumberOfTuples( numRows*np );
for( int j = 0; j < np; j++ )
{
double *ptr = doubleArr->GetPointer(j*numRows);
memcpy(ptr, &(globalElements[j*numElements+col*numRows]), numRows*sizeof( double ) );
}
newTable->AddColumn(doubleArr);
doubleArr->Delete();
}
delete [] localElements;
delete [] globalElements;
}
// ----------------------------------------------------------------------
int vtkKMeansDistanceFunctor::GetDataType()
{
return VTK_DOUBLE;
}
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