# PowerWeighting

VTKExamples/Cxx/TextAnalysis/PowerWeighting

### Code

PowerWeighting.cxx

    #include <vtkSmartPointer.h>
    #include <vtkPowerWeighting.h>
    #include <vtkDenseArray.h>

    int main(int, char *[])
    {
      vtkSmartPointer<vtkDenseArray<double> > array =
        vtkSmartPointer<vtkDenseArray<double> >::New();
      array->Resize(2);
      array->SetValue(0, 3);
      array->SetValue(1, 4);

      vtkSmartPointer<vtkArrayData> arrayData =
        vtkSmartPointer<vtkArrayData>::New();
      arrayData->AddArray(array);

      vtkSmartPointer<vtkPowerWeighting> powerWeighting =
        vtkSmartPointer<vtkPowerWeighting>::New();
      powerWeighting->SetPower(2);
      powerWeighting->SetInputConnection(arrayData->GetProducerPort());
      powerWeighting->Update();

      vtkSmartPointer<vtkArrayData> outputArrayData = powerWeighting->GetOutput();
      vtkSmartPointer<vtkDenseArray<double> > outputArray = vtkDenseArray<double>::SafeDownCast(outputArrayData->GetArray(0));

      std::cout << outputArray->GetValue(0) << std::endl;
      std::cout << outputArray->GetValue(1) << std::endl;

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(PowerWeighting)

    find_package(VTK REQUIRED)
    include(${VTK_USE_FILE})

    add_executable(PowerWeighting MACOSX_BUNDLE PowerWeighting.cxx)

    target_link_libraries(PowerWeighting ${VTK_LIBRARIES})

### Download and Build PowerWeighting

Click here to download PowerWeighting and its CMakeLists.txt file. Once the tarball PowerWeighting.tar has been downloaded and extracted,

    cd PowerWeighting/build

If VTK is installed:

    cmake ..

If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

    cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

Build the project:

    make

and run it:

    ./PowerWeighting

WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.