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*9566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc,&argv,(char*)0,help)); 13*9566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL)); 14c4762a1bSJed Brown 15*9566063dSJacob Faibussowitsch PetscCall(PetscMalloc1(n,&la_nodes)); 16*9566063dSJacob Faibussowitsch PetscCall(PetscMalloc1(n,&la_weights)); 17*9566063dSJacob Faibussowitsch PetscCall(PetscMalloc1(n,&n_nodes)); 18*9566063dSJacob Faibussowitsch PetscCall(PetscMalloc1(n,&n_weights)); 19*9566063dSJacob Faibussowitsch PetscCall(PetscDTGaussLobattoLegendreQuadrature(n,PETSCGAUSSLOBATTOLEGENDRE_VIA_LINEAR_ALGEBRA,la_nodes,la_weights)); 20c4762a1bSJed Brown 21*9566063dSJacob Faibussowitsch PetscCall(PetscViewerASCIIPrintf(PETSC_VIEWER_STDOUT_SELF,"Gauss-Lobatto-Legendre nodes and weights computed via linear algebra: \n")); 22*9566063dSJacob Faibussowitsch PetscCall(PetscRealView(n,la_nodes,PETSC_VIEWER_STDOUT_SELF)); 23*9566063dSJacob Faibussowitsch PetscCall(PetscRealView(n,la_weights,PETSC_VIEWER_STDOUT_SELF)); 24*9566063dSJacob Faibussowitsch PetscCall(PetscDTGaussLobattoLegendreQuadrature(n,PETSCGAUSSLOBATTOLEGENDRE_VIA_NEWTON,n_nodes,n_weights)); 25*9566063dSJacob Faibussowitsch PetscCall(PetscViewerASCIIPrintf(PETSC_VIEWER_STDOUT_SELF,"Gauss-Lobatto-Legendre nodes and weights computed via Newton: \n")); 26*9566063dSJacob Faibussowitsch PetscCall(PetscRealView(n,n_nodes,PETSC_VIEWER_STDOUT_SELF)); 27*9566063dSJacob Faibussowitsch PetscCall(PetscRealView(n,n_weights,PETSC_VIEWER_STDOUT_SELF)); 28c4762a1bSJed Brown 29c4762a1bSJed Brown for (i=0; i<n; i++) { 30c4762a1bSJed Brown la_nodes[i] -= n_nodes[i]; 31c4762a1bSJed Brown la_weights[i] -= n_weights[i]; 32c4762a1bSJed Brown } 33*9566063dSJacob Faibussowitsch PetscCall(PetscViewerASCIIPrintf(PETSC_VIEWER_STDOUT_SELF,"Difference: \n")); 34*9566063dSJacob Faibussowitsch PetscCall(PetscRealView(n,la_nodes,PETSC_VIEWER_STDOUT_SELF)); 35*9566063dSJacob Faibussowitsch PetscCall(PetscRealView(n,la_weights,PETSC_VIEWER_STDOUT_SELF)); 36c4762a1bSJed Brown 37*9566063dSJacob Faibussowitsch PetscCall(PetscFree(la_nodes)); 38*9566063dSJacob Faibussowitsch PetscCall(PetscFree(la_weights)); 39*9566063dSJacob Faibussowitsch PetscCall(PetscFree(n_nodes)); 40*9566063dSJacob Faibussowitsch PetscCall(PetscFree(n_weights)); 41c4762a1bSJed Brown 42*9566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 43b122ec5aSJacob Faibussowitsch return 0; 44c4762a1bSJed Brown } 45c4762a1bSJed Brown 46c4762a1bSJed Brown /*TEST 47c4762a1bSJed Brown 48c4762a1bSJed Brown test: 49c4762a1bSJed Brown 50c4762a1bSJed Brown TEST*/ 51