1 2 static char help[] = "Tests converting a SBAIJ matrix to BAIJ format with MatConvert. Modified from ex55.c\n\n"; 3 4 #include <petscmat.h> 5 /* Usage: ./ex141 -mat_view */ 6 7 int main(int argc,char **args) 8 { 9 Mat C,B; 10 PetscInt i,bs=2,mbs,m,block,d_nz=6,col[3]; 11 PetscMPIInt size; 12 char file[PETSC_MAX_PATH_LEN]; 13 PetscViewer fd; 14 PetscBool equal,loadmat; 15 PetscScalar value[4]; 16 PetscInt ridx[2],cidx[2]; 17 18 PetscFunctionBeginUser; 19 PetscCall(PetscInitialize(&argc,&args,(char*)0,help)); 20 PetscCall(PetscOptionsGetString(NULL,NULL,"-f",file,sizeof(file),&loadmat)); 21 PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size)); 22 PetscCheck(size == 1,PETSC_COMM_WORLD,PETSC_ERR_WRONG_MPI_SIZE,"This is a uniprocessor example only!"); 23 24 /* input matrix C */ 25 if (loadmat) { 26 /* Open binary file. Load a sbaij matrix, then destroy the viewer. */ 27 PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,file,FILE_MODE_READ,&fd)); 28 PetscCall(MatCreate(PETSC_COMM_WORLD,&C)); 29 PetscCall(MatSetType(C,MATSEQSBAIJ)); 30 PetscCall(MatLoad(C,fd)); 31 PetscCall(PetscViewerDestroy(&fd)); 32 } else { /* Create a sbaij mat with bs>1 */ 33 mbs =8; 34 PetscCall(PetscOptionsGetInt(NULL,NULL,"-mbs",&mbs,NULL)); 35 m = mbs*bs; 36 PetscCall(MatCreate(PETSC_COMM_WORLD,&C)); 37 PetscCall(MatSetSizes(C,PETSC_DECIDE,PETSC_DECIDE,m,m)); 38 PetscCall(MatSetType(C,MATSBAIJ)); 39 PetscCall(MatSetFromOptions(C)); 40 PetscCall(MatSeqSBAIJSetPreallocation(C,bs,d_nz,NULL)); 41 PetscCall(MatSetUp(C)); 42 PetscCall(MatSetOption(C,MAT_IGNORE_LOWER_TRIANGULAR,PETSC_TRUE)); 43 44 for (block=0; block<mbs; block++) { 45 /* diagonal blocks */ 46 value[0] = -1.0; value[1] = 4.0; value[2] = -1.0; 47 for (i=1+block*bs; i<bs-1+block*bs; i++) { 48 col[0] = i-1; col[1] = i; col[2] = i+1; 49 PetscCall(MatSetValues(C,1,&i,3,col,value,INSERT_VALUES)); 50 } 51 i = bs - 1+block*bs; col[0] = bs - 2+block*bs; col[1] = bs - 1+block*bs; 52 53 value[0]=-1.0; value[1]=4.0; 54 PetscCall(MatSetValues(C,1,&i,2,col,value,INSERT_VALUES)); 55 56 i = 0+block*bs; col[0] = 0+block*bs; col[1] = 1+block*bs; 57 58 value[0]=4.0; value[1] = -1.0; 59 PetscCall(MatSetValues(C,1,&i,2,col,value,INSERT_VALUES)); 60 } 61 /* off-diagonal blocks */ 62 value[0]=-1.0; value[1] = -0.1; value[2] = 0.0; value[3] = -1.0; /* row-oriented */ 63 for (block=0; block<mbs-1; block++) { 64 for (i=0; i<bs; i++) { 65 ridx[i] = block*bs+i; cidx[i] = (block+1)*bs+i; 66 } 67 PetscCall(MatSetValues(C,bs,ridx,bs,cidx,value,INSERT_VALUES)); 68 } 69 PetscCall(MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY)); 70 PetscCall(MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY)); 71 } 72 73 /* convert C to BAIJ format */ 74 PetscCall(MatConvert(C,MATSEQBAIJ,MAT_INITIAL_MATRIX,&B)); 75 PetscCall(MatMultEqual(B,C,10,&equal)); 76 PetscCheck(equal,PETSC_COMM_SELF,PETSC_ERR_PLIB,"MatConvert fails!"); 77 78 PetscCall(MatDestroy(&B)); 79 PetscCall(MatDestroy(&C)); 80 PetscCall(PetscFinalize()); 81 return 0; 82 } 83 84 /*TEST 85 86 test: 87 output_file: output/ex141.out 88 89 TEST*/ 90