1c4762a1bSJed Brown static char help[] = "Tests 1D Gauss-Lobatto-Legendre discretization on [-1, 1].\n\n"; 2c4762a1bSJed Brown 3c4762a1bSJed Brown #include <petscdt.h> 4c4762a1bSJed Brown #include <petscviewer.h> 5c4762a1bSJed Brown 6c4762a1bSJed Brown int main(int argc,char **argv) 7c4762a1bSJed Brown { 8c4762a1bSJed Brown 9c4762a1bSJed Brown PetscInt n = 3,i; 10c4762a1bSJed Brown PetscReal *la_nodes,*la_weights,*n_nodes,*n_weights; 11c4762a1bSJed Brown 12*327415f7SBarry Smith PetscFunctionBeginUser; 139566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc,&argv,(char*)0,help)); 149566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL)); 15c4762a1bSJed Brown 169566063dSJacob Faibussowitsch PetscCall(PetscMalloc1(n,&la_nodes)); 179566063dSJacob Faibussowitsch PetscCall(PetscMalloc1(n,&la_weights)); 189566063dSJacob Faibussowitsch PetscCall(PetscMalloc1(n,&n_nodes)); 199566063dSJacob Faibussowitsch PetscCall(PetscMalloc1(n,&n_weights)); 209566063dSJacob Faibussowitsch PetscCall(PetscDTGaussLobattoLegendreQuadrature(n,PETSCGAUSSLOBATTOLEGENDRE_VIA_LINEAR_ALGEBRA,la_nodes,la_weights)); 21c4762a1bSJed Brown 229566063dSJacob Faibussowitsch PetscCall(PetscViewerASCIIPrintf(PETSC_VIEWER_STDOUT_SELF,"Gauss-Lobatto-Legendre nodes and weights computed via linear algebra: \n")); 239566063dSJacob Faibussowitsch PetscCall(PetscRealView(n,la_nodes,PETSC_VIEWER_STDOUT_SELF)); 249566063dSJacob Faibussowitsch PetscCall(PetscRealView(n,la_weights,PETSC_VIEWER_STDOUT_SELF)); 259566063dSJacob Faibussowitsch PetscCall(PetscDTGaussLobattoLegendreQuadrature(n,PETSCGAUSSLOBATTOLEGENDRE_VIA_NEWTON,n_nodes,n_weights)); 269566063dSJacob Faibussowitsch PetscCall(PetscViewerASCIIPrintf(PETSC_VIEWER_STDOUT_SELF,"Gauss-Lobatto-Legendre nodes and weights computed via Newton: \n")); 279566063dSJacob Faibussowitsch PetscCall(PetscRealView(n,n_nodes,PETSC_VIEWER_STDOUT_SELF)); 289566063dSJacob Faibussowitsch PetscCall(PetscRealView(n,n_weights,PETSC_VIEWER_STDOUT_SELF)); 29c4762a1bSJed Brown 30c4762a1bSJed Brown for (i=0; i<n; i++) { 31c4762a1bSJed Brown la_nodes[i] -= n_nodes[i]; 32c4762a1bSJed Brown la_weights[i] -= n_weights[i]; 33c4762a1bSJed Brown } 349566063dSJacob Faibussowitsch PetscCall(PetscViewerASCIIPrintf(PETSC_VIEWER_STDOUT_SELF,"Difference: \n")); 359566063dSJacob Faibussowitsch PetscCall(PetscRealView(n,la_nodes,PETSC_VIEWER_STDOUT_SELF)); 369566063dSJacob Faibussowitsch PetscCall(PetscRealView(n,la_weights,PETSC_VIEWER_STDOUT_SELF)); 37c4762a1bSJed Brown 389566063dSJacob Faibussowitsch PetscCall(PetscFree(la_nodes)); 399566063dSJacob Faibussowitsch PetscCall(PetscFree(la_weights)); 409566063dSJacob Faibussowitsch PetscCall(PetscFree(n_nodes)); 419566063dSJacob Faibussowitsch PetscCall(PetscFree(n_weights)); 42c4762a1bSJed Brown 439566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 44b122ec5aSJacob Faibussowitsch return 0; 45c4762a1bSJed Brown } 46c4762a1bSJed Brown 47c4762a1bSJed Brown /*TEST 48c4762a1bSJed Brown 49c4762a1bSJed Brown test: 50c4762a1bSJed Brown 51c4762a1bSJed Brown TEST*/ 52