Actual source code: ex2.c

  2: static char help[] = "Tests MatTranspose(), MatNorm(), MatValid(), and MatAXPY().\n\n";

 4:  #include petscmat.h

  6: #define  TestMatNorm
  7: #define  TestMatTranspose
  8: #define  TestMatNorm_tmat
  9: #define  TestMatAXPY
 10: #undef   TestMatAXPY2

 14: int main(int argc,char **argv)
 15: {
 16:   Mat              mat,tmat = 0;
 17:   PetscInt         m = 7,n,i,j,rstart,rend,rect = 0;
 18:   PetscErrorCode   ierr;
 19:   PetscMPIInt      size,rank;
 20:   PetscTruth       flg;
 21:   PetscScalar      v, alpha;
 22:   PetscReal        normf,normi,norm1;

 24:   PetscInitialize(&argc,&argv,(char*)0,help);
 25:   PetscViewerSetFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_COMMON);
 26:   PetscOptionsGetInt(PETSC_NULL,"-m",&m,PETSC_NULL);
 27:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 28:   MPI_Comm_size(PETSC_COMM_WORLD,&size);
 29:   n = m;
 30:   PetscOptionsHasName(PETSC_NULL,"-rectA",&flg);
 31:   if (flg) {n += 2; rect = 1;}
 32:   PetscOptionsHasName(PETSC_NULL,"-rectB",&flg);
 33:   if (flg) {n -= 2; rect = 1;}

 35:   /* ------- Assemble matrix, test MatValid() --------- */

 37:   MatCreate(PETSC_COMM_WORLD,&mat);
 38:   MatSetSizes(mat,PETSC_DECIDE,PETSC_DECIDE,m,n);
 39:   MatSetFromOptions(mat);
 40:   MatGetOwnershipRange(mat,&rstart,&rend);
 41:   for (i=rstart; i<rend; i++) {
 42:     for (j=0; j<n; j++) {
 43:       v=10*i+j;
 44:       MatSetValues(mat,1,&i,1,&j,&v,INSERT_VALUES);
 45:     }
 46:   }
 47:   MatAssemblyBegin(mat,MAT_FINAL_ASSEMBLY);
 48:   MatAssemblyEnd(mat,MAT_FINAL_ASSEMBLY);

 50:   /* Test whether matrix has been corrupted (just to demonstrate this
 51:      routine) not needed in most application codes. */
 52:   MatValid(mat,(PetscTruth*)&flg);
 53:   if (!flg) SETERRQ(1,"Corrupted matrix.");

 55:   /* ----------------- Test MatNorm()  ----------------- */
 56: #ifdef TestMatNorm
 57:   MatNorm(mat,NORM_FROBENIUS,&normf);
 58:   MatNorm(mat,NORM_1,&norm1);
 59:   MatNorm(mat,NORM_INFINITY,&normi);
 60:   PetscPrintf(PETSC_COMM_WORLD,"original: Frobenious norm = %g, one norm = %g, infinity norm = %g\n",
 61:                      normf,norm1,normi);
 62:   MatView(mat,PETSC_VIEWER_STDOUT_WORLD);
 63: #endif
 64:   /* --------------- Test MatTranspose()  -------------- */
 65: #ifdef TestMatTranspose
 66:   PetscOptionsHasName(PETSC_NULL,"-in_place",&flg);
 67:   if (!rect && flg) {
 68:     MatTranspose(mat,0);   /* in-place transpose */
 69:     tmat = mat; mat = 0;
 70:   } else {      /* out-of-place transpose */
 71:     MatTranspose(mat,&tmat);
 72:   }
 73: #endif
 74:   /* ----------------- Test MatNorm()  ----------------- */
 75: #ifdef TestMatNorm_tmat
 76:   /* Print info about transpose matrix */
 77:   MatNorm(tmat,NORM_FROBENIUS,&normf);
 78:   MatNorm(tmat,NORM_1,&norm1);
 79:   MatNorm(tmat,NORM_INFINITY,&normi);
 80:   PetscPrintf(PETSC_COMM_WORLD,"transpose: Frobenious norm = %g, one norm = %g, infinity norm = %g\n",
 81:                      normf,norm1,normi);
 82:   MatView(tmat,PETSC_VIEWER_STDOUT_WORLD);
 83: #endif
 84:   /* ----------------- Test MatAXPY()  ----------------- */
 85: #ifdef TestMatAXPY
 86:   if (mat && !rect) {
 87:     alpha = 1.0;
 88:     PetscOptionsGetScalar(PETSC_NULL,"-alpha",&alpha,PETSC_NULL);
 89:     PetscPrintf(PETSC_COMM_WORLD,"matrix addition:  B = B + alpha * A\n");
 90:     MatAXPY(tmat,alpha,mat,DIFFERENT_NONZERO_PATTERN);
 91:     MatView(tmat,PETSC_VIEWER_STDOUT_WORLD);
 92:   }
 93:   MatDestroy(tmat);
 94: #endif 
 95: #ifdef TestMatAXPY2
 96:     Mat matB;
 97:     alpha = 1.0;
 98:     PetscPrintf(PETSC_COMM_WORLD,"matrix addition:  B = B + alpha * A, SAME_NONZERO_PATTERN\n");
 99:     MatDuplicate(mat,MAT_COPY_VALUES,&matB);
100:     MatAXPY(matB,alpha,mat,SAME_NONZERO_PATTERN);
101:     MatView(matB,PETSC_VIEWER_STDOUT_WORLD);
102:     MatDestroy(matB);

104:     /* get matB that has nonzeros of mat in all even numbers of row and col */
105:     MatCreate(PETSC_COMM_WORLD,&matB);
106:     MatSetSizes(matB,PETSC_DECIDE,PETSC_DECIDE,m,n);
107:     MatSetFromOptions(matB);
108:     MatGetOwnershipRange(matB,&rstart,&rend);
109:     for (i=rstart; i<rend; i += 2) {
110:       for (j=0; j<n; j += 2) {
111:         v=10*i+j;
112:         MatSetValues(matB,1,&i,1,&j,&v,INSERT_VALUES);
113:       }
114:     }
115:     MatAssemblyBegin(matB,MAT_FINAL_ASSEMBLY);
116:     MatAssemblyEnd(matB,MAT_FINAL_ASSEMBLY);
117:     PetscPrintf(PETSC_COMM_WORLD," B: original matrix:\n");
118:     MatView(mat,PETSC_VIEWER_STDOUT_WORLD);
119:     PetscPrintf(PETSC_COMM_WORLD," A(a subset of B):\n");
120:     MatView(matB,PETSC_VIEWER_STDOUT_WORLD);
121:     PetscPrintf(PETSC_COMM_WORLD,"matrix addition:  B = B + alpha * A, SUBSET_NONZERO_PATTERN\n");
122:     MatAXPY(mat,alpha,matB,SUBSET_NONZERO_PATTERN);
123:     MatView(mat,PETSC_VIEWER_STDOUT_WORLD);
124: 
125:     PetscPrintf(PETSC_COMM_WORLD,"matrix addition:  B = B + alpha * A, SUBSET_NONZERO_PATTERN\n");
126:     MatAXPY(mat,alpha,matB,SUBSET_NONZERO_PATTERN);
127:     MatView(mat,PETSC_VIEWER_STDOUT_WORLD);
128: 
129:     MatDestroy(matB);
130: #endif 
131: 

133:   /* Free data structures */
134:   if (mat)  {MatDestroy(mat);}

136:   PetscFinalize();
137:   return 0;
138: }
139: