1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Saves a rectangular sparse matrix to disk.\n\n"; 3c4762a1bSJed Brown 4c4762a1bSJed Brown #include <petscmat.h> 5c4762a1bSJed Brown 6c4762a1bSJed Brown int main(int argc,char **args) 7c4762a1bSJed Brown { 8c4762a1bSJed Brown Mat A; 9c4762a1bSJed Brown PetscInt m = 100,n = 11,js[11],i,j,cnt; 10c4762a1bSJed Brown PetscScalar values[11]; 11c4762a1bSJed Brown PetscViewer view; 12c4762a1bSJed Brown 13*9566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc,&args,(char*)0,help)); 14*9566063dSJacob Faibussowitsch PetscCall(MatCreateSeqAIJ(PETSC_COMM_WORLD,m,n,20,0,&A)); 15c4762a1bSJed Brown 16c4762a1bSJed Brown for (i=0; i<n; i++) values[i] = (PetscReal)i; 17c4762a1bSJed Brown 18c4762a1bSJed Brown for (i=0; i<m; i++) { 19c4762a1bSJed Brown cnt = 0; 20c4762a1bSJed Brown if (i % 2) { 21c4762a1bSJed Brown for (j=0; j<n; j += 2) { 22c4762a1bSJed Brown js[cnt++] = j; 23c4762a1bSJed Brown } 24c4762a1bSJed Brown } else { 25c4762a1bSJed Brown ; 26c4762a1bSJed Brown } 27*9566063dSJacob Faibussowitsch PetscCall(MatSetValues(A,1,&i,cnt,js,values,INSERT_VALUES)); 28c4762a1bSJed Brown } 29*9566063dSJacob Faibussowitsch PetscCall(MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY)); 30*9566063dSJacob Faibussowitsch PetscCall(MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY)); 31c4762a1bSJed Brown 32*9566063dSJacob Faibussowitsch PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,"rect",FILE_MODE_WRITE,&view)); 33*9566063dSJacob Faibussowitsch PetscCall(MatView(A,view)); 34*9566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&view)); 35c4762a1bSJed Brown 36*9566063dSJacob Faibussowitsch PetscCall(MatDestroy(&A)); 37c4762a1bSJed Brown 38*9566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 39b122ec5aSJacob Faibussowitsch return 0; 40c4762a1bSJed Brown } 41c4762a1bSJed Brown 42c4762a1bSJed Brown /*TEST 43c4762a1bSJed Brown 44c4762a1bSJed Brown test: 45c4762a1bSJed Brown 46c4762a1bSJed Brown TEST*/ 47