1*c4762a1bSJed Brown 2*c4762a1bSJed Brown static char help[] = "Tests MatCreateSubmatrix() with certain entire rows of matrix, modified from ex181.c."; 3*c4762a1bSJed Brown 4*c4762a1bSJed Brown #include <petscmat.h> 5*c4762a1bSJed Brown 6*c4762a1bSJed Brown int main(int argc,char **args) 7*c4762a1bSJed Brown { 8*c4762a1bSJed Brown Mat C,A; 9*c4762a1bSJed Brown PetscInt i,j,m = 3,n = 2,rstart,rend,cstart,cend; 10*c4762a1bSJed Brown PetscMPIInt size,rank; 11*c4762a1bSJed Brown PetscErrorCode ierr; 12*c4762a1bSJed Brown PetscScalar v; 13*c4762a1bSJed Brown IS isrow,iscol; 14*c4762a1bSJed Brown 15*c4762a1bSJed Brown ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 16*c4762a1bSJed Brown ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRQ(ierr); 17*c4762a1bSJed Brown ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRQ(ierr); 18*c4762a1bSJed Brown n = 2*size; 19*c4762a1bSJed Brown 20*c4762a1bSJed Brown ierr = MatCreate(PETSC_COMM_WORLD,&C);CHKERRQ(ierr); 21*c4762a1bSJed Brown ierr = MatSetSizes(C,PETSC_DECIDE,PETSC_DECIDE,m*n,m*n);CHKERRQ(ierr); 22*c4762a1bSJed Brown ierr = MatSetFromOptions(C);CHKERRQ(ierr); 23*c4762a1bSJed Brown ierr = MatSetUp(C);CHKERRQ(ierr); 24*c4762a1bSJed Brown 25*c4762a1bSJed Brown /* 26*c4762a1bSJed Brown This is JUST to generate a nice test matrix, all processors fill up 27*c4762a1bSJed Brown the entire matrix. This is not something one would ever do in practice. 28*c4762a1bSJed Brown */ 29*c4762a1bSJed Brown ierr = MatGetOwnershipRange(C,&rstart,&rend);CHKERRQ(ierr); 30*c4762a1bSJed Brown for (i=rstart; i<rend; i++) { 31*c4762a1bSJed Brown for (j=0; j<m*n; j++) { 32*c4762a1bSJed Brown v = i + j + 1; 33*c4762a1bSJed Brown ierr = MatSetValues(C,1,&i,1,&j,&v,INSERT_VALUES);CHKERRQ(ierr); 34*c4762a1bSJed Brown } 35*c4762a1bSJed Brown } 36*c4762a1bSJed Brown ierr = MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 37*c4762a1bSJed Brown ierr = MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 38*c4762a1bSJed Brown ierr = PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_COMMON);CHKERRQ(ierr); 39*c4762a1bSJed Brown ierr = MatView(C,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 40*c4762a1bSJed Brown ierr = PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 41*c4762a1bSJed Brown 42*c4762a1bSJed Brown /* 43*c4762a1bSJed Brown Generate a new matrix consisting every column of the original matrix 44*c4762a1bSJed Brown */ 45*c4762a1bSJed Brown ierr = MatGetOwnershipRange(C,&rstart,&rend);CHKERRQ(ierr); 46*c4762a1bSJed Brown ierr = MatGetOwnershipRangeColumn(C,&cstart,&cend);CHKERRQ(ierr); 47*c4762a1bSJed Brown 48*c4762a1bSJed Brown ierr = ISCreateStride(PETSC_COMM_WORLD,rend-rstart > 0 ? rend-rstart-1 : 0,rstart,1,&isrow);CHKERRQ(ierr); 49*c4762a1bSJed Brown ierr = ISCreateStride(PETSC_COMM_WORLD,cend-cstart,cstart,1,&iscol);CHKERRQ(ierr); 50*c4762a1bSJed Brown ierr = MatCreateSubMatrix(C,isrow,NULL,MAT_INITIAL_MATRIX,&A);CHKERRQ(ierr); 51*c4762a1bSJed Brown 52*c4762a1bSJed Brown /* Change C to test the case MAT_REUSE_MATRIX */ 53*c4762a1bSJed Brown if (!rank ) { 54*c4762a1bSJed Brown i = 0; j = 0; v = 100; 55*c4762a1bSJed Brown ierr = MatSetValues(C,1,&i,1,&j,&v,INSERT_VALUES);CHKERRQ(ierr); 56*c4762a1bSJed Brown } 57*c4762a1bSJed Brown ierr = MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 58*c4762a1bSJed Brown ierr = MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 59*c4762a1bSJed Brown 60*c4762a1bSJed Brown ierr = MatCreateSubMatrix(C,isrow,NULL,MAT_REUSE_MATRIX,&A);CHKERRQ(ierr); 61*c4762a1bSJed Brown ierr = PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_COMMON);CHKERRQ(ierr); 62*c4762a1bSJed Brown ierr = MatView(A,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 63*c4762a1bSJed Brown ierr = PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 64*c4762a1bSJed Brown 65*c4762a1bSJed Brown ierr = ISDestroy(&isrow);CHKERRQ(ierr); 66*c4762a1bSJed Brown ierr = ISDestroy(&iscol);CHKERRQ(ierr); 67*c4762a1bSJed Brown ierr = MatDestroy(&A);CHKERRQ(ierr); 68*c4762a1bSJed Brown ierr = MatDestroy(&C);CHKERRQ(ierr); 69*c4762a1bSJed Brown ierr = PetscFinalize(); 70*c4762a1bSJed Brown return ierr; 71*c4762a1bSJed Brown } 72*c4762a1bSJed Brown 73*c4762a1bSJed Brown 74*c4762a1bSJed Brown /*TEST 75*c4762a1bSJed Brown 76*c4762a1bSJed Brown test: 77*c4762a1bSJed Brown nsize: 2 78*c4762a1bSJed Brown 79*c4762a1bSJed Brown TEST*/ 80