Actual source code: ex38.c


  2: static char help[] = "Test interface of Elemental. \n\n";

  4: #include <petscmat.h>

  6: int main(int argc,char **args)
  7: {
  8:   Mat            C,Caij;
  9:   PetscInt       i,j,m = 5,n,nrows,ncols;
 10:   const PetscInt *rows,*cols;
 11:   IS             isrows,iscols;
 12:   PetscBool      flg,Test_MatMatMult=PETSC_FALSE,mats_view=PETSC_FALSE;
 13:   PetscScalar    *v;
 14:   PetscMPIInt    rank,size;

 16:   PetscInitialize(&argc,&args,(char*)0,help);
 17:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 18:   MPI_Comm_size(PETSC_COMM_WORLD,&size);
 19:   PetscOptionsHasName(NULL,NULL,"-mats_view",&mats_view);

 21:   /* Get local block or element size*/
 22:   PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL);
 23:   n    = m;
 24:   PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);

 26:   MatCreate(PETSC_COMM_WORLD,&C);
 27:   MatSetSizes(C,m,n,PETSC_DECIDE,PETSC_DECIDE);
 28:   MatSetType(C,MATELEMENTAL);
 29:   MatSetFromOptions(C);
 30:   MatSetUp(C);

 32:   PetscOptionsHasName(NULL,NULL,"-row_oriented",&flg);
 33:   if (flg) MatSetOption(C,MAT_ROW_ORIENTED,PETSC_TRUE);
 34:   MatGetOwnershipIS(C,&isrows,&iscols);
 35:   PetscOptionsHasName(NULL,NULL,"-Cexp_view_ownership",&flg);
 36:   if (flg) { /* View ownership of explicit C */
 37:     IS tmp;
 38:     PetscPrintf(PETSC_COMM_WORLD,"Ownership of explicit C:\n");
 39:     PetscPrintf(PETSC_COMM_WORLD,"Row index set:\n");
 40:     ISOnComm(isrows,PETSC_COMM_WORLD,PETSC_USE_POINTER,&tmp);
 41:     ISView(tmp,PETSC_VIEWER_STDOUT_WORLD);
 42:     ISDestroy(&tmp);
 43:     PetscPrintf(PETSC_COMM_WORLD,"Column index set:\n");
 44:     ISOnComm(iscols,PETSC_COMM_WORLD,PETSC_USE_POINTER,&tmp);
 45:     ISView(tmp,PETSC_VIEWER_STDOUT_WORLD);
 46:     ISDestroy(&tmp);
 47:   }

 49:   /* Set local matrix entries */
 50:   ISGetLocalSize(isrows,&nrows);
 51:   ISGetIndices(isrows,&rows);
 52:   ISGetLocalSize(iscols,&ncols);
 53:   ISGetIndices(iscols,&cols);
 54:   PetscMalloc1(nrows*ncols,&v);
 55:   for (i=0; i<nrows; i++) {
 56:     for (j=0; j<ncols; j++) {
 57:       /*v[i*ncols+j] = (PetscReal)(rank);*/
 58:       v[i*ncols+j] = (PetscReal)(rank*10000+100*rows[i]+cols[j]);
 59:     }
 60:   }
 61:   MatSetValues(C,nrows,rows,ncols,cols,v,INSERT_VALUES);
 62:   ISRestoreIndices(isrows,&rows);
 63:   ISRestoreIndices(iscols,&cols);
 64:   MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);
 65:   MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);

 67:   /* Test MatView() */
 68:   if (mats_view) {
 69:     MatView(C,PETSC_VIEWER_STDOUT_WORLD);
 70:   }

 72:   /* Test MatMissingDiagonal() */
 73:   MatMissingDiagonal(C,&flg,NULL);

 76:   /* Set unowned matrix entries - add subdiagonals and diagonals from proc[0] */
 77:   if (rank == 0) {
 78:     PetscInt M,N,cols[2];
 79:     MatGetSize(C,&M,&N);
 80:     for (i=0; i<M; i++) {
 81:       cols[0] = i;   v[0] = i + 0.5;
 82:       cols[1] = i-1; v[1] = 0.5;
 83:       if (i) {
 84:         MatSetValues(C,1,&i,2,cols,v,ADD_VALUES);
 85:       } else {
 86:         MatSetValues(C,1,&i,1,&i,v,ADD_VALUES);
 87:       }
 88:     }
 89:   }
 90:   MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);
 91:   MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);

 93:   /* Test MatMult() */
 94:   MatComputeOperator(C,MATAIJ,&Caij);
 95:   MatMultEqual(C,Caij,5,&flg);
 97:   MatMultTransposeEqual(C,Caij,5,&flg);

100:   /* Test MatMultAdd() and MatMultTransposeAddEqual() */
101:   MatMultAddEqual(C,Caij,5,&flg);
103:   MatMultTransposeAddEqual(C,Caij,5,&flg);

106:   /* Test MatMatMult() */
107:   PetscOptionsHasName(NULL,NULL,"-test_matmatmult",&Test_MatMatMult);
108:   if (Test_MatMatMult) {
109:     Mat CCelem,CCaij;
110:     MatMatMult(C,C,MAT_INITIAL_MATRIX,PETSC_DEFAULT,&CCelem);
111:     MatMatMult(Caij,Caij,MAT_INITIAL_MATRIX,PETSC_DEFAULT,&CCaij);
112:     MatMultEqual(CCelem,CCaij,5,&flg);
114:     MatDestroy(&CCaij);
115:     MatDestroy(&CCelem);
116:   }

118:   PetscFree(v);
119:   ISDestroy(&isrows);
120:   ISDestroy(&iscols);
121:   MatDestroy(&C);
122:   MatDestroy(&Caij);
123:   PetscFinalize();
124:   return 0;
125: }

127: /*TEST

129:    test:
130:       nsize: 2
131:       requires: elemental
132:       args: -mat_type elemental -m 2 -n 3

134:    test:
135:       suffix: 2
136:       nsize: 6
137:       requires: elemental
138:       args: -mat_type elemental -m 2 -n 2

140:    test:
141:       suffix: 3
142:       nsize: 6
143:       requires: elemental
144:       args: -mat_type elemental -m 2 -n 2 -test_matmatmult
145:       output_file: output/ex38_2.out

147: TEST*/