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 PetscErrorCode ierr; 9c4762a1bSJed Brown 10c4762a1bSJed Brown PetscInt n = 3,i; 11c4762a1bSJed Brown PetscReal *la_nodes,*la_weights,*n_nodes,*n_weights; 12c4762a1bSJed Brown 13c4762a1bSJed Brown ierr = PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr; 14*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL)); 15c4762a1bSJed Brown 16*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscMalloc1(n,&la_nodes)); 17*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscMalloc1(n,&la_weights)); 18*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscMalloc1(n,&n_nodes)); 19*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscMalloc1(n,&n_weights)); 20*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscDTGaussLobattoLegendreQuadrature(n,PETSCGAUSSLOBATTOLEGENDRE_VIA_LINEAR_ALGEBRA,la_nodes,la_weights)); 21c4762a1bSJed Brown 22*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscViewerASCIIPrintf(PETSC_VIEWER_STDOUT_SELF,"Gauss-Lobatto-Legendre nodes and weights computed via linear algebra: \n")); 23*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscRealView(n,la_nodes,PETSC_VIEWER_STDOUT_SELF)); 24*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscRealView(n,la_weights,PETSC_VIEWER_STDOUT_SELF)); 25*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscDTGaussLobattoLegendreQuadrature(n,PETSCGAUSSLOBATTOLEGENDRE_VIA_NEWTON,n_nodes,n_weights)); 26*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscViewerASCIIPrintf(PETSC_VIEWER_STDOUT_SELF,"Gauss-Lobatto-Legendre nodes and weights computed via Newton: \n")); 27*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscRealView(n,n_nodes,PETSC_VIEWER_STDOUT_SELF)); 28*5f80ce2aSJacob Faibussowitsch CHKERRQ(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 } 34*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscViewerASCIIPrintf(PETSC_VIEWER_STDOUT_SELF,"Difference: \n")); 35*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscRealView(n,la_nodes,PETSC_VIEWER_STDOUT_SELF)); 36*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscRealView(n,la_weights,PETSC_VIEWER_STDOUT_SELF)); 37c4762a1bSJed Brown 38*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscFree(la_nodes)); 39*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscFree(la_weights)); 40*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscFree(n_nodes)); 41*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscFree(n_weights)); 42c4762a1bSJed Brown 43c4762a1bSJed Brown ierr = PetscFinalize(); 44c4762a1bSJed Brown return ierr; 45c4762a1bSJed Brown } 46c4762a1bSJed Brown 47c4762a1bSJed Brown /*TEST 48c4762a1bSJed Brown 49c4762a1bSJed Brown test: 50c4762a1bSJed Brown 51c4762a1bSJed Brown TEST*/ 52