1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Tests MatCreateSubmatrix() with certain entire rows of matrix, modified from ex181.c."; 3c4762a1bSJed Brown 4c4762a1bSJed Brown #include <petscmat.h> 5c4762a1bSJed Brown 6c4762a1bSJed Brown int main(int argc,char **args) 7c4762a1bSJed Brown { 8c4762a1bSJed Brown Mat C,A; 9c4762a1bSJed Brown PetscInt i,j,m = 3,n = 2,rstart,rend,cstart,cend; 10c4762a1bSJed Brown PetscMPIInt size,rank; 11c4762a1bSJed Brown PetscScalar v; 12c4762a1bSJed Brown IS isrow,iscol; 13c4762a1bSJed Brown 14*b122ec5aSJacob Faibussowitsch CHKERRQ(PetscInitialize(&argc,&args,(char*)0,help)); 155f80ce2aSJacob Faibussowitsch CHKERRMPI(MPI_Comm_rank(PETSC_COMM_WORLD,&rank)); 165f80ce2aSJacob Faibussowitsch CHKERRMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size)); 17c4762a1bSJed Brown n = 2*size; 18c4762a1bSJed Brown 195f80ce2aSJacob Faibussowitsch CHKERRQ(MatCreate(PETSC_COMM_WORLD,&C)); 205f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetSizes(C,PETSC_DECIDE,PETSC_DECIDE,m*n,m*n)); 215f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetFromOptions(C)); 225f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetUp(C)); 23c4762a1bSJed Brown 24c4762a1bSJed Brown /* 25c4762a1bSJed Brown This is JUST to generate a nice test matrix, all processors fill up 26c4762a1bSJed Brown the entire matrix. This is not something one would ever do in practice. 27c4762a1bSJed Brown */ 285f80ce2aSJacob Faibussowitsch CHKERRQ(MatGetOwnershipRange(C,&rstart,&rend)); 29c4762a1bSJed Brown for (i=rstart; i<rend; i++) { 30c4762a1bSJed Brown for (j=0; j<m*n; j++) { 31c4762a1bSJed Brown v = i + j + 1; 325f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetValues(C,1,&i,1,&j,&v,INSERT_VALUES)); 33c4762a1bSJed Brown } 34c4762a1bSJed Brown } 355f80ce2aSJacob Faibussowitsch CHKERRQ(MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY)); 365f80ce2aSJacob Faibussowitsch CHKERRQ(MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY)); 375f80ce2aSJacob Faibussowitsch CHKERRQ(PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_COMMON)); 385f80ce2aSJacob Faibussowitsch CHKERRQ(MatView(C,PETSC_VIEWER_STDOUT_WORLD)); 395f80ce2aSJacob Faibussowitsch CHKERRQ(PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD)); 40c4762a1bSJed Brown 41c4762a1bSJed Brown /* 42c4762a1bSJed Brown Generate a new matrix consisting every column of the original matrix 43c4762a1bSJed Brown */ 445f80ce2aSJacob Faibussowitsch CHKERRQ(MatGetOwnershipRange(C,&rstart,&rend)); 455f80ce2aSJacob Faibussowitsch CHKERRQ(MatGetOwnershipRangeColumn(C,&cstart,&cend)); 46c4762a1bSJed Brown 475f80ce2aSJacob Faibussowitsch CHKERRQ(ISCreateStride(PETSC_COMM_WORLD,rend-rstart > 0 ? rend-rstart-1 : 0,rstart,1,&isrow)); 485f80ce2aSJacob Faibussowitsch CHKERRQ(ISCreateStride(PETSC_COMM_WORLD,cend-cstart,cstart,1,&iscol)); 495f80ce2aSJacob Faibussowitsch CHKERRQ(MatCreateSubMatrix(C,isrow,NULL,MAT_INITIAL_MATRIX,&A)); 50c4762a1bSJed Brown 51c4762a1bSJed Brown /* Change C to test the case MAT_REUSE_MATRIX */ 52dd400576SPatrick Sanan if (rank == 0) { 53c4762a1bSJed Brown i = 0; j = 0; v = 100; 545f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetValues(C,1,&i,1,&j,&v,INSERT_VALUES)); 55c4762a1bSJed Brown } 565f80ce2aSJacob Faibussowitsch CHKERRQ(MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY)); 575f80ce2aSJacob Faibussowitsch CHKERRQ(MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY)); 58c4762a1bSJed Brown 595f80ce2aSJacob Faibussowitsch CHKERRQ(MatCreateSubMatrix(C,isrow,NULL,MAT_REUSE_MATRIX,&A)); 605f80ce2aSJacob Faibussowitsch CHKERRQ(PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_COMMON)); 615f80ce2aSJacob Faibussowitsch CHKERRQ(MatView(A,PETSC_VIEWER_STDOUT_WORLD)); 625f80ce2aSJacob Faibussowitsch CHKERRQ(PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD)); 63c4762a1bSJed Brown 645f80ce2aSJacob Faibussowitsch CHKERRQ(ISDestroy(&isrow)); 655f80ce2aSJacob Faibussowitsch CHKERRQ(ISDestroy(&iscol)); 665f80ce2aSJacob Faibussowitsch CHKERRQ(MatDestroy(&A)); 675f80ce2aSJacob Faibussowitsch CHKERRQ(MatDestroy(&C)); 68*b122ec5aSJacob Faibussowitsch CHKERRQ(PetscFinalize()); 69*b122ec5aSJacob Faibussowitsch return 0; 70c4762a1bSJed Brown } 71c4762a1bSJed Brown 72c4762a1bSJed Brown /*TEST 73c4762a1bSJed Brown 74c4762a1bSJed Brown test: 75c4762a1bSJed Brown nsize: 2 76c4762a1bSJed Brown 77c4762a1bSJed Brown TEST*/ 78