text: #include <vtkSmartPointer.h>
  #include <vtkProperty.h>
  #include <vtkPointData.h>
  #include <vtkPolyData.h>
  #include <vtkXMLPolyDataWriter.h>
  #include <vtkIntArray.h>
  #include <vtkMultiBlockDataSet.h>
  #include <vtkPoints.h>
  #include <vtkTable.h>
  #include <vtkDoubleArray.h>
  #include <vtkPKMeansStatistics.h>
  
  //display
  #include <vtkPolyDataMapper.h>
  #include <vtkActor.h>
  #include <vtkRenderWindow.h>
  #include <vtkRenderer.h>
  #include <vtkRenderWindowInteractor.h>
  #include <vtkVertexGlyphFilter.h>
  #include <vtkInteractorStyleTrackballCamera.h>
  
  #include <sstream>
  
  int main(int, char*[])
  {
    //create 2 clusters, one near (0,0,0) and the other near (3,3,3)
    vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
  
    points->InsertNextPoint ( 0.0, 0.0, 0.0 );
    points->InsertNextPoint ( 3.0, 3.0, 3.0 );
    points->InsertNextPoint ( 0.1, 0.1, 0.1 );
    points->InsertNextPoint ( 3.1, 3.1, 3.1 );
    points->InsertNextPoint ( 0.2, 0.2, 0.2 );
    points->InsertNextPoint ( 3.2, 3.2, 3.2 );
  
    // Get the points into the format needed for KMeans
    vtkSmartPointer<vtkTable> inputData = vtkSmartPointer<vtkTable>::New();
  
    for ( int c = 0; c < 3; ++c )
    {
      std::stringstream colName;
      colName << "coord " << c;
      vtkSmartPointer<vtkDoubleArray> doubleArray = vtkSmartPointer<vtkDoubleArray>::New();
      doubleArray->SetNumberOfComponents(1);
      doubleArray->SetName( colName.str().c_str() );
      doubleArray->SetNumberOfTuples(points->GetNumberOfPoints());
  
      for ( int r = 0; r < points->GetNumberOfPoints(); ++ r )
      {
        double p[3];
        points->GetPoint(r, p);
  
        doubleArray->SetValue( r, p[c] );
      }
  
      inputData->AddColumn( doubleArray );
    }
  
    vtkSmartPointer<vtkPKMeansStatistics> pKMeansStatistics = vtkSmartPointer<vtkPKMeansStatistics>::New();
    //vtkSmartPointer<vtkKMeansStatistics> pKMeansStatistics = vtkSmartPointer<vtkKMeansStatistics>::New();
    //pks->SetMaxNumIterations( 10 );
    pKMeansStatistics->SetInputData( vtkStatisticsAlgorithm::INPUT_DATA, inputData );
    pKMeansStatistics->SetColumnStatus( inputData->GetColumnName( 0 ) , 1 );
    pKMeansStatistics->SetColumnStatus( inputData->GetColumnName( 1 ) , 1 );
    pKMeansStatistics->SetColumnStatus( inputData->GetColumnName( 2 ) , 1 );
    pKMeansStatistics->RequestSelectedColumns();
    pKMeansStatistics->SetAssessOption( true );
    pKMeansStatistics->SetDefaultNumberOfClusters( 2 );
    pKMeansStatistics->Update() ;
  
    // Display the results
    pKMeansStatistics->GetOutput()->Dump();
  
    vtkSmartPointer<vtkIntArray> clusterArray = vtkSmartPointer<vtkIntArray>::New();
    clusterArray->SetNumberOfComponents(1);
    clusterArray->SetName( "ClusterId" );
  
    for(unsigned int r = 0; r < pKMeansStatistics->GetOutput()->GetNumberOfRows(); r++)
    {
      vtkVariant v = pKMeansStatistics->GetOutput()->GetValue(r, pKMeansStatistics->GetOutput()->GetNumberOfColumns() - 1);
      std::cout << "Point " << r << " is in cluster " << v.ToInt() << std::endl;
      clusterArray->InsertNextValue(v.ToInt());
    }
  
    vtkSmartPointer<vtkPolyData> polydata = vtkSmartPointer<vtkPolyData>::New();
    polydata->SetPoints(points);
    polydata->GetPointData()->SetScalars(clusterArray);
  
    // Output the cluster centers
  
    vtkMultiBlockDataSet* outputMetaDS = dynamic_cast<vtkMultiBlockDataSet*>( pKMeansStatistics->GetOutputDataObject( vtkStatisticsAlgorithm::OUTPUT_MODEL ) );
    vtkSmartPointer<vtkTable> outputMeta = dynamic_cast<vtkTable*>( outputMetaDS->GetBlock( 0 ) );
    //vtkSmartPointer<vtkTable> outputMeta = dynamic_cast<vtkTable*>( outputMetaDS->GetBlock( 1 ) );
    vtkDoubleArray* coord0 = dynamic_cast<vtkDoubleArray*>(outputMeta->GetColumnByName("coord 0"));
    vtkDoubleArray* coord1 = dynamic_cast<vtkDoubleArray*>(outputMeta->GetColumnByName("coord 1"));
    vtkDoubleArray* coord2 = dynamic_cast<vtkDoubleArray*>(outputMeta->GetColumnByName("coord 2"));
  
    for(unsigned int i = 0; i < coord0->GetNumberOfTuples(); ++i)
    {
      std::cout << coord0->GetValue(i) << " " << coord1->GetValue(i) << " " << coord2->GetValue(i) << std::endl;
    }
    return EXIT_SUCCESS;
  }
  