HomogeneousLeastSquares
VTKExamples/Cxx/Math/HomogeneousLeastSquares
Code¶
HomogeneousLeastSquares.cxx
#include <vtkSmartPointer.h> #include <vtkMath.h> /* allocate memory for an nrow x ncol matrix */ template<class TReal> TReal **create_matrix ( long nrow, long ncol ) { typedef TReal* TRealPointer; TReal **m = new TRealPointer[nrow]; TReal* block = ( TReal* ) calloc ( nrow*ncol, sizeof ( TReal ) ); m[0] = block; for ( int row = 1; row < nrow; ++row ) { m[ row ] = &block[ row * ncol ]; } return m; } /* free a TReal matrix allocated with matrix() */ template<class TReal> void free_matrix ( TReal **m ) { free ( m[0] ); delete[] m; } int main (int, char *[]) { //Solve XM = Y; int numberOfSamples = 3; int numberOfVariables = 2; double **x = create_matrix<double> (numberOfSamples, numberOfVariables); x[0][0] = 1; x[0][1] = 2; x[1][0] = 2; x[1][1] = 4; x[2][0] = 3; x[2][1] = 6; double **m = create_matrix<double> ( numberOfVariables, 1 ); vtkMath::SolveHomogeneousLeastSquares(numberOfSamples, x, numberOfVariables, m); std::cout << "Solution is: " << m[0][0] << " " << m[1][0] << std::endl; free_matrix(x); free_matrix(m); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(HomogeneousLeastSquares) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(HomogeneousLeastSquares MACOSX_BUNDLE HomogeneousLeastSquares.cxx) target_link_libraries(HomogeneousLeastSquares ${VTK_LIBRARIES})
Download and Build HomogeneousLeastSquares¶
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Click here to download HomogeneousLeastSquares and its CMakeLists.txt file. Once the tarball HomogeneousLeastSquares.tar has been downloaded and extracted,
cd HomogeneousLeastSquares/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:
./HomogeneousLeastSquares
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.