1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Saves a dense matrix in a dense format (binary).\n\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 PetscScalar v; 10c4762a1bSJed Brown PetscInt i,j,m = 4,n = 4; 11c4762a1bSJed Brown PetscMPIInt rank,size; 12c4762a1bSJed Brown PetscViewer viewer; 13c4762a1bSJed Brown 14*9566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc,&args,(char*)0,help)); 15*9566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD,&rank)); 16*9566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size)); 17*9566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL)); 18*9566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL)); 19c4762a1bSJed Brown 20c4762a1bSJed Brown /* PART 1: Generate matrix, then write it in binary format */ 21c4762a1bSJed Brown 22c4762a1bSJed Brown /* Generate matrix */ 23*9566063dSJacob Faibussowitsch PetscCall(MatCreateSeqDense(PETSC_COMM_WORLD,m,n,NULL,&C)); 24c4762a1bSJed Brown for (i=0; i<m; i++) { 25c4762a1bSJed Brown for (j=0; j<n; j++) { 26c4762a1bSJed Brown v = i*m+j; 27*9566063dSJacob Faibussowitsch PetscCall(MatSetValues(C,1,&i,1,&j,&v,INSERT_VALUES)); 28c4762a1bSJed Brown } 29c4762a1bSJed Brown } 30*9566063dSJacob Faibussowitsch PetscCall(MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY)); 31*9566063dSJacob Faibussowitsch PetscCall(MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY)); 32*9566063dSJacob Faibussowitsch PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,"matrix.dat",FILE_MODE_WRITE,&viewer)); 33*9566063dSJacob Faibussowitsch PetscCall(MatView(C,viewer)); 34*9566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&viewer)); 35*9566063dSJacob Faibussowitsch PetscCall(MatDestroy(&C)); 36*9566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 37b122ec5aSJacob Faibussowitsch return 0; 38c4762a1bSJed Brown } 39c4762a1bSJed Brown 40c4762a1bSJed Brown /*TEST 41c4762a1bSJed Brown 42c4762a1bSJed Brown test: 43c4762a1bSJed Brown 44c4762a1bSJed Brown TEST*/ 45