# SparseArray

VTKExamples/Cxx/Utilities/SparseArray

### Code

SparseArray.cxx

    #include <vtkSmartPointer.h>
    #include <vtkSparseArray.h>

    int main(int, char *[])
    {
      vtkSmartPointer<vtkSparseArray<double> > array =
        vtkSmartPointer<vtkSparseArray<double> >::New();
      array->Resize(5,1);
      array->SetNullValue(-1);

      for(unsigned int i = 0; i < 5; i++)
      {
        array->SetValue(i, 0, i);
      }

      for(unsigned int i = 0; i < 6; i++)
      {
        double val = array->GetValue(i,0);
        std::cout << val << std::endl;
      }

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(SparseArray)

    find_package(VTK COMPONENTS
      vtkCommonCore QUIET)
    if (NOT VTK_FOUND)
      message("Skipping SparseArray: ${VTK_NOT_FOUND_MESSAGE}")
      return ()
    endif()
    message (STATUS "VTK_VERSION: ${VTK_VERSION}")
    if (VTK_VERSION VERSION_LESS "8.90.0")
      # old system
      include(${VTK_USE_FILE})
      add_executable(SparseArray MACOSX_BUNDLE SparseArray.cxx )
      target_link_libraries(SparseArray PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(SparseArray MACOSX_BUNDLE SparseArray.cxx )
      target_link_libraries(SparseArray PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS SparseArray
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build SparseArray

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

    cd SparseArray/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:

    ./SparseArray

WINDOWS USERS

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