1 2 static char help[] = "Tests converting a matrix to another format with MatConvert().\n\n"; 3 4 #include <petscmat.h> 5 6 int main(int argc,char **args) 7 { 8 Mat C,A; 9 PetscInt i,j,m = 5,n = 4,Ii,J; 10 PetscErrorCode ierr; 11 PetscMPIInt rank,size; 12 PetscScalar v; 13 char mtype[256]; 14 15 ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 16 ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRQ(ierr); 17 18 /* This example does not work correctly for np > 2 */ 19 ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRQ(ierr); 20 if (size > 2) SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_WRONG_MPI_SIZE,"Use np <= 2"); 21 22 /* Create the matrix for the five point stencil, YET AGAIN */ 23 ierr = MatCreate(PETSC_COMM_WORLD,&C);CHKERRQ(ierr); 24 ierr = MatSetSizes(C,PETSC_DECIDE,PETSC_DECIDE,m*n,m*n);CHKERRQ(ierr); 25 ierr = MatSetFromOptions(C);CHKERRQ(ierr); 26 ierr = MatSetUp(C);CHKERRQ(ierr); 27 for (i=0; i<m; i++) { 28 for (j=2*rank; j<2*rank+2; j++) { 29 v = -1.0; Ii = j + n*i; 30 if (i>0) {J = Ii - n; ierr = MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);} 31 if (i<m-1) {J = Ii + n; ierr = MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);} 32 if (j>0) {J = Ii - 1; ierr = MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);} 33 if (j<n-1) {J = Ii + 1; ierr = MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);} 34 v = 4.0; ierr = MatSetValues(C,1,&Ii,1,&Ii,&v,INSERT_VALUES);CHKERRQ(ierr); 35 } 36 } 37 38 ierr = MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 39 ierr = MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 40 ierr = PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_INFO);CHKERRQ(ierr); 41 ierr = MatView(C,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 42 ierr = PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 43 ierr = MatView(C,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 44 45 ierr = PetscStrcpy(mtype,MATSAME);CHKERRQ(ierr); 46 ierr = PetscOptionsGetString(NULL,NULL,"-conv_mat_type",mtype,256,NULL);CHKERRQ(ierr); 47 ierr = MatConvert(C,mtype,MAT_INITIAL_MATRIX,&A);CHKERRQ(ierr); 48 ierr = PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_INFO);CHKERRQ(ierr); 49 ierr = MatView(A,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 50 ierr = PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 51 ierr = PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_IMPL);CHKERRQ(ierr); 52 ierr = MatView(A,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 53 ierr = PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 54 55 /* Free data structures */ 56 ierr = MatDestroy(&A);CHKERRQ(ierr); 57 ierr = MatDestroy(&C);CHKERRQ(ierr); 58 59 ierr = PetscFinalize(); 60 return ierr; 61 } 62 63 64 /*TEST 65 66 test: 67 args: -conv_mat_type seqaij 68 69 TEST*/ 70