1 2 static char help[] = "Tests converting a parallel AIJ formatted matrix to the parallel Row format.\n\ 3 This also tests MatGetRow() and MatRestoreRow() for the parallel case.\n\n"; 4 5 #include <petscmat.h> 6 7 int main(int argc,char **args) 8 { 9 Mat C,A; 10 PetscInt i,j,m = 3,n = 2,Ii,J,rstart,rend,nz; 11 PetscMPIInt rank,size; 12 PetscErrorCode ierr; 13 const PetscInt *idx; 14 PetscScalar v; 15 const PetscScalar *values; 16 17 ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 18 ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRQ(ierr); 19 ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRQ(ierr); 20 n = 2*size; 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 = MatMPIAIJSetPreallocation(C,5,NULL,5,NULL);CHKERRQ(ierr); 27 ierr = MatSeqAIJSetPreallocation(C,5,NULL);CHKERRQ(ierr); 28 for (i=0; i<m; i++) { 29 for (j=2*rank; j<2*rank+2; j++) { 30 v = -1.0; Ii = j + n*i; 31 if (i>0) {J = Ii - n; ierr = MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);} 32 if (i<m-1) {J = Ii + n; ierr = MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);} 33 if (j>0) {J = Ii - 1; ierr = MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);} 34 if (j<n-1) {J = Ii + 1; ierr = MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);} 35 v = 4.0; ierr = MatSetValues(C,1,&Ii,1,&Ii,&v,INSERT_VALUES);CHKERRQ(ierr); 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 = MatGetOwnershipRange(C,&rstart,&rend);CHKERRQ(ierr); 46 for (i=rstart; i<rend; i++) { 47 ierr = MatGetRow(C,i,&nz,&idx,&values);CHKERRQ(ierr); 48 ierr = PetscSynchronizedFPrintf(PETSC_COMM_WORLD,stdout,"[%d] get row %D: ",rank,i);CHKERRQ(ierr); 49 for (j=0; j<nz; j++) { 50 ierr = PetscSynchronizedFPrintf(PETSC_COMM_WORLD,stdout,"%D %g ",idx[j],(double)PetscRealPart(values[j]));CHKERRQ(ierr); 51 } 52 ierr = PetscSynchronizedFPrintf(PETSC_COMM_WORLD,stdout,"\n");CHKERRQ(ierr); 53 ierr = MatRestoreRow(C,i,&nz,&idx,&values);CHKERRQ(ierr); 54 } 55 ierr = PetscSynchronizedFlush(PETSC_COMM_WORLD,stdout);CHKERRQ(ierr); 56 57 ierr = MatConvert(C,MATSAME,MAT_INITIAL_MATRIX,&A);CHKERRQ(ierr); 58 ierr = PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_INFO);CHKERRQ(ierr); 59 ierr = MatView(A,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 60 ierr = PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 61 ierr = MatView(A,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 62 63 ierr = MatDestroy(&A);CHKERRQ(ierr); 64 ierr = MatDestroy(&C);CHKERRQ(ierr); 65 ierr = PetscFinalize(); 66 return ierr; 67 } 68 69 70 /*TEST 71 72 test: 73 args: -mat_type seqaij 74 75 TEST*/ 76