1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Tests sequential and parallel MatGetRow() and MatRestoreRow().\n"; 3c4762a1bSJed Brown 4c4762a1bSJed Brown #include <petscmat.h> 5c4762a1bSJed Brown 6c4762a1bSJed Brown int main(int argc,char **args) 7c4762a1bSJed Brown { 8c4762a1bSJed Brown Mat C; 9c4762a1bSJed Brown PetscInt i,j,m = 5,n = 5,Ii,J,nz,rstart,rend; 10c4762a1bSJed Brown PetscMPIInt rank; 11c4762a1bSJed Brown const PetscInt *idx; 12c4762a1bSJed Brown PetscScalar v; 13c4762a1bSJed Brown const PetscScalar *values; 14c4762a1bSJed Brown 15*9566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc,&args,(char*)0,help)); 16c4762a1bSJed Brown /* Create the matrix for the five point stencil, YET AGAIN */ 17*9566063dSJacob Faibussowitsch PetscCall(MatCreate(PETSC_COMM_WORLD,&C)); 18*9566063dSJacob Faibussowitsch PetscCall(MatSetSizes(C,PETSC_DECIDE,PETSC_DECIDE,m*n,m*n)); 19*9566063dSJacob Faibussowitsch PetscCall(MatSetFromOptions(C)); 20*9566063dSJacob Faibussowitsch PetscCall(MatSetUp(C)); 21c4762a1bSJed Brown for (i=0; i<m; i++) { 22c4762a1bSJed Brown for (j=0; j<n; j++) { 23c4762a1bSJed Brown v = -1.0; Ii = j + n*i; 24*9566063dSJacob Faibussowitsch if (i>0) {J = Ii - n; PetscCall(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 25*9566063dSJacob Faibussowitsch if (i<m-1) {J = Ii + n; PetscCall(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 26*9566063dSJacob Faibussowitsch if (j>0) {J = Ii - 1; PetscCall(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 27*9566063dSJacob Faibussowitsch if (j<n-1) {J = Ii + 1; PetscCall(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 28*9566063dSJacob Faibussowitsch v = 4.0; PetscCall(MatSetValues(C,1,&Ii,1,&Ii,&v,INSERT_VALUES)); 29c4762a1bSJed Brown } 30c4762a1bSJed Brown } 31*9566063dSJacob Faibussowitsch PetscCall(MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY)); 32*9566063dSJacob Faibussowitsch PetscCall(MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY)); 33*9566063dSJacob Faibussowitsch PetscCall(MatView(C,PETSC_VIEWER_STDOUT_WORLD)); 34c4762a1bSJed Brown 35*9566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD,&rank)); 36*9566063dSJacob Faibussowitsch PetscCall(MatGetOwnershipRange(C,&rstart,&rend)); 37c4762a1bSJed Brown for (i=rstart; i<rend; i++) { 38*9566063dSJacob Faibussowitsch PetscCall(MatGetRow(C,i,&nz,&idx,&values)); 39dd400576SPatrick Sanan if (rank == 0) { 40c4762a1bSJed Brown for (j=0; j<nz; j++) { 41*9566063dSJacob Faibussowitsch PetscCall(PetscPrintf(PETSC_COMM_SELF,"%" PetscInt_FMT " %g ",idx[j],(double)PetscRealPart(values[j]))); 42c4762a1bSJed Brown } 43*9566063dSJacob Faibussowitsch PetscCall(PetscPrintf(PETSC_COMM_SELF,"\n")); 44c4762a1bSJed Brown } 45*9566063dSJacob Faibussowitsch PetscCall(MatRestoreRow(C,i,&nz,&idx,&values)); 46c4762a1bSJed Brown } 47c4762a1bSJed Brown 48*9566063dSJacob Faibussowitsch PetscCall(MatDestroy(&C)); 49*9566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 50b122ec5aSJacob Faibussowitsch return 0; 51c4762a1bSJed Brown } 52c4762a1bSJed Brown 53c4762a1bSJed Brown /*TEST 54c4762a1bSJed Brown 55c4762a1bSJed Brown test: 56c4762a1bSJed Brown 57c4762a1bSJed Brown TEST*/ 58