Date: 2013-07-02T14:44:01+00:00

Actual source code: ex38.c
petsc-3.4.2 2013-07-02

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

      4: #include <petscmat.h>

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

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

     24:   /* Get local block or element size*/
     25:   PetscOptionsGetInt(NULL,"-m",&m,NULL);
     26:   n    = m;
     27:   PetscOptionsGetInt(NULL,"-n",&n,NULL);

     29:   MatCreate(PETSC_COMM_WORLD,&C);
     30:   MatSetSizes(C,m,n,PETSC_DECIDE,PETSC_DECIDE);
     31:   MatSetType(C,MATELEMENTAL);
     32:   MatSetFromOptions(C);
     33:   MatSetUp(C);

     35:   PetscOptionsHasName(NULL,"-row_oriented",&flg);
     36:   if (flg) {MatSetOption(C,MAT_ROW_ORIENTED,PETSC_TRUE);}
     37:   MatGetOwnershipIS(C,&isrows,&iscols);
     38:   PetscOptionsHasName(NULL,"-Cexp_view_ownership",&flg);
     39:   if (flg) { /* View ownership of explicit C */
     40:     IS tmp;
     41:     PetscPrintf(PETSC_COMM_WORLD,"Ownership of explicit C:\n");
     42:     PetscPrintf(PETSC_COMM_WORLD,"Row index set:\n");
     43:     ISOnComm(isrows,PETSC_COMM_WORLD,PETSC_USE_POINTER,&tmp);
     44:     ISView(tmp,PETSC_VIEWER_STDOUT_WORLD);
     45:     ISDestroy(&tmp);
     46:     PetscPrintf(PETSC_COMM_WORLD,"Column index set:\n");
     47:     ISOnComm(iscols,PETSC_COMM_WORLD,PETSC_USE_POINTER,&tmp);
     48:     ISView(tmp,PETSC_VIEWER_STDOUT_WORLD);
     49:     ISDestroy(&tmp);
     50:   }

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

     70:   /* Test MatView() */
     71:   if (mats_view) {
     72:     MatView(C,PETSC_VIEWER_STDOUT_WORLD);
     73:   }

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

     92:   /* Test MatMult() */
     93:   MatComputeExplicitOperator(C,&Caij);
     94:   MatMultEqual(C,Caij,5,&flg);
     95:   if (!flg) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_NOTSAMETYPE,"C != Caij. MatMultEqual() fails");
     96:   MatMultTransposeEqual(C,Caij,5,&flg);
     97:   if (!flg) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_NOTSAMETYPE,"C != Caij. MatMultTransposeEqual() fails");

     99:   /* Test MatMultAdd() and MatMultTransposeAddEqual() */
    100:   MatMultAddEqual(C,Caij,5,&flg);
    101:   if (!flg) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_NOTSAMETYPE,"C != Caij. MatMultAddEqual() fails");
    102:   MatMultTransposeAddEqual(C,Caij,5,&flg);
    103:   if (!flg) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_NOTSAMETYPE,"C != Caij. MatMultTransposeAddEqual() fails");

    105:   /* Test MatMatMult() */
    106:   PetscOptionsHasName(NULL,"-test_matmatmult",&Test_MatMatMult);
    107:   if (Test_MatMatMult) {
    108:     Mat CCelem,CCaij;
    109:     MatMatMult(C,C,MAT_INITIAL_MATRIX,PETSC_DEFAULT,&CCelem);
    110:     MatMatMult(Caij,Caij,MAT_INITIAL_MATRIX,PETSC_DEFAULT,&CCaij);
    111:     MatMultEqual(CCelem,CCaij,5,&flg);
    112:     if (!flg) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_NOTSAMETYPE,"CCelem != CCaij. MatMatMult() fails");
    113:     MatDestroy(&CCaij);
    114:     MatDestroy(&CCelem);
    115:   }

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