1 /* 2 * ex195.c 3 * 4 * Created on: Aug 24, 2015 5 * Author: Fande Kong <fdkong.jd@gmail.com> 6 */ 7 8 static char help[] = " Demonstrate the use of MatConvert_Nest_AIJ\n"; 9 10 #include <petscmat.h> 11 12 int main(int argc,char **args) 13 { 14 Mat A1,A2,A3,A4,A5,B,C,C1,nest; 15 Mat mata[4]; 16 Mat aij; 17 MPI_Comm comm; 18 PetscInt m,M,n,istart,iend,ii,i,J,j,K=10; 19 PetscScalar v; 20 PetscMPIInt size; 21 PetscErrorCode ierr; 22 PetscBool equal; 23 24 ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 25 comm = PETSC_COMM_WORLD; 26 CHKERRMPI(MPI_Comm_size(comm,&size)); 27 28 /* 29 Assemble the matrix for the five point stencil, YET AGAIN 30 */ 31 CHKERRQ(MatCreate(comm,&A1)); 32 m=2,n=2; 33 CHKERRQ(MatSetSizes(A1,PETSC_DECIDE,PETSC_DECIDE,m*n,m*n)); 34 CHKERRQ(MatSetFromOptions(A1)); 35 CHKERRQ(MatSetUp(A1)); 36 CHKERRQ(MatGetOwnershipRange(A1,&istart,&iend)); 37 for (ii=istart; ii<iend; ii++) { 38 v = -1.0; i = ii/n; j = ii - i*n; 39 if (i>0) {J = ii - n; CHKERRQ(MatSetValues(A1,1,&ii,1,&J,&v,INSERT_VALUES));} 40 if (i<m-1) {J = ii + n; CHKERRQ(MatSetValues(A1,1,&ii,1,&J,&v,INSERT_VALUES));} 41 if (j>0) {J = ii - 1; CHKERRQ(MatSetValues(A1,1,&ii,1,&J,&v,INSERT_VALUES));} 42 if (j<n-1) {J = ii + 1; CHKERRQ(MatSetValues(A1,1,&ii,1,&J,&v,INSERT_VALUES));} 43 v = 4.0; CHKERRQ(MatSetValues(A1,1,&ii,1,&ii,&v,INSERT_VALUES)); 44 } 45 CHKERRQ(MatAssemblyBegin(A1,MAT_FINAL_ASSEMBLY)); 46 CHKERRQ(MatAssemblyEnd(A1,MAT_FINAL_ASSEMBLY)); 47 CHKERRQ(MatView(A1,PETSC_VIEWER_STDOUT_WORLD)); 48 49 CHKERRQ(MatDuplicate(A1,MAT_COPY_VALUES,&A2)); 50 CHKERRQ(MatDuplicate(A1,MAT_COPY_VALUES,&A3)); 51 CHKERRQ(MatDuplicate(A1,MAT_COPY_VALUES,&A4)); 52 53 /*create a nest matrix */ 54 CHKERRQ(MatCreate(comm,&nest)); 55 CHKERRQ(MatSetType(nest,MATNEST)); 56 mata[0]=A1,mata[1]=A2,mata[2]=A3,mata[3]=A4; 57 CHKERRQ(MatNestSetSubMats(nest,2,NULL,2,NULL,mata)); 58 CHKERRQ(MatSetUp(nest)); 59 CHKERRQ(MatConvert(nest,MATAIJ,MAT_INITIAL_MATRIX,&aij)); 60 CHKERRQ(MatView(aij,PETSC_VIEWER_STDOUT_WORLD)); 61 62 /* create a dense matrix */ 63 CHKERRQ(MatGetSize(nest,&M,NULL)); 64 CHKERRQ(MatGetLocalSize(nest,&m,NULL)); 65 CHKERRQ(MatCreateDense(comm,m,PETSC_DECIDE,M,K,NULL,&B)); 66 CHKERRQ(MatSetRandom(B,PETSC_NULL)); 67 CHKERRQ(MatAssemblyBegin(B,MAT_FINAL_ASSEMBLY)); 68 CHKERRQ(MatAssemblyEnd(B,MAT_FINAL_ASSEMBLY)); 69 70 /* C = nest*B_dense */ 71 CHKERRQ(MatMatMult(nest,B,MAT_INITIAL_MATRIX,PETSC_DEFAULT,&C)); 72 CHKERRQ(MatMatMult(nest,B,MAT_REUSE_MATRIX,PETSC_DEFAULT,&C)); 73 CHKERRQ(MatMatMultEqual(nest,B,C,10,&equal)); 74 PetscCheck(equal,PETSC_COMM_WORLD,PETSC_ERR_PLIB,"Error in C != nest*B_dense"); 75 76 /* Test B = nest*C, reuse C and B with MatProductCreateWithMat() */ 77 /* C has been obtained from nest*B. Clear internal data structures related to factors to prevent circular references */ 78 CHKERRQ(MatProductClear(C)); 79 CHKERRQ(MatProductCreateWithMat(nest,C,NULL,B)); 80 CHKERRQ(MatProductSetType(B,MATPRODUCT_AB)); 81 CHKERRQ(MatProductSetFromOptions(B)); 82 CHKERRQ(MatProductSymbolic(B)); 83 CHKERRQ(MatProductNumeric(B)); 84 CHKERRQ(MatMatMultEqual(nest,C,B,10,&equal)); 85 PetscCheck(equal,PETSC_COMM_WORLD,PETSC_ERR_PLIB,"Error in B != nest*C_dense"); 86 CHKERRQ(MatConvert(nest,MATAIJ,MAT_INPLACE_MATRIX,&nest)); 87 CHKERRQ(MatEqual(nest,aij,&equal)); 88 PetscCheck(equal,PETSC_COMM_WORLD,PETSC_ERR_PLIB,"Error in aij != nest"); 89 CHKERRQ(MatDestroy(&nest)); 90 91 if (size > 1) { /* Do not know why this test fails for size = 1 */ 92 CHKERRQ(MatCreateTranspose(A1,&A5)); /* A1 is symmetric */ 93 mata[0] = A5; 94 CHKERRQ(MatCreate(comm,&nest)); 95 CHKERRQ(MatSetType(nest,MATNEST)); 96 CHKERRQ(MatNestSetSubMats(nest,2,NULL,2,NULL,mata)); 97 CHKERRQ(MatSetUp(nest)); 98 CHKERRQ(MatMatMult(nest,B,MAT_INITIAL_MATRIX,PETSC_DEFAULT,&C1)); 99 CHKERRQ(MatMatMult(nest,B,MAT_REUSE_MATRIX,PETSC_DEFAULT,&C1)); 100 101 CHKERRQ(MatMatMultEqual(nest,B,C1,10,&equal)); 102 PetscCheck(equal,PETSC_COMM_WORLD,PETSC_ERR_PLIB,"Error in C1 != C"); 103 CHKERRQ(MatDestroy(&C1)); 104 CHKERRQ(MatDestroy(&A5)); 105 CHKERRQ(MatDestroy(&nest)); 106 } 107 108 CHKERRQ(MatDestroy(&C)); 109 CHKERRQ(MatDestroy(&B)); 110 CHKERRQ(MatDestroy(&aij)); 111 CHKERRQ(MatDestroy(&A1)); 112 CHKERRQ(MatDestroy(&A2)); 113 CHKERRQ(MatDestroy(&A3)); 114 CHKERRQ(MatDestroy(&A4)); 115 ierr = PetscFinalize(); 116 return ierr; 117 } 118 119 /*TEST 120 121 test: 122 nsize: 2 123 124 test: 125 suffix: 2 126 127 TEST*/ 128