Actual source code: ex2.c

  1: /*$Id: ex2.c,v 1.25 2001/08/07 21:30:08 bsmith Exp $*/

  3: static char help[] = "Tests MatTranspose(), MatNorm(), MatValid(), and MatAXPY().nn";

 5:  #include petscmat.h

  7: int main(int argc,char **argv)
  8: {
  9:   Mat          mat,tmat = 0;
 10:   int          m = 7,n,i,j,ierr,size,rank,rstart,rend,rect = 0;
 11:   PetscTruth   flg;
 12:   PetscScalar  v;
 13:   PetscReal    normf,normi,norm1;

 15:   PetscInitialize(&argc,&argv,(char*)0,help);
 16:   PetscViewerSetFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_COMMON);
 17:   PetscOptionsGetInt(PETSC_NULL,"-m",&m,PETSC_NULL);
 18:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 19:   MPI_Comm_size(PETSC_COMM_WORLD,&size);
 20:   n = m;
 21:   PetscOptionsHasName(PETSC_NULL,"-rectA",&flg);
 22:   if (flg) {n += 2; rect = 1;}
 23:   PetscOptionsHasName(PETSC_NULL,"-rectB",&flg);
 24:   if (flg) {n -= 2; rect = 1;}

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

 28:   MatCreate(PETSC_COMM_WORLD,m,PETSC_DECIDE,PETSC_DECIDE,n,&mat);
 29:   MatSetFromOptions(mat);
 30:   MatGetOwnershipRange(mat,&rstart,&rend);
 31:   for (i=rstart; i<rend; i++) {
 32:     for (j=0; j<n; j++) {
 33:       v=10*i+j;
 34:       MatSetValues(mat,1,&i,1,&j,&v,INSERT_VALUES);
 35:     }
 36:   }
 37:   MatAssemblyBegin(mat,MAT_FINAL_ASSEMBLY);
 38:   MatAssemblyEnd(mat,MAT_FINAL_ASSEMBLY);

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

 45:   /* ----------------- Test MatNorm()  ----------------- */

 47:   MatNorm(mat,NORM_FROBENIUS,&normf);
 48:   MatNorm(mat,NORM_1,&norm1);
 49:   MatNorm(mat,NORM_INFINITY,&normi);
 50:   PetscPrintf(PETSC_COMM_WORLD,"original: Frobenious norm = %g, one norm = %g, infinity norm = %gn",
 51:                      normf,norm1,normi);
 52:   MatView(mat,PETSC_VIEWER_STDOUT_WORLD);

 54:   /* --------------- Test MatTranspose()  -------------- */

 56:   PetscOptionsHasName(PETSC_NULL,"-in_place",&flg);
 57:   if (!rect && flg) {
 58:     MatTranspose(mat,0);   /* in-place transpose */
 59:     tmat = mat; mat = 0;
 60:   } else {      /* out-of-place transpose */
 61:     MatTranspose(mat,&tmat);
 62:   }

 64:   /* ----------------- Test MatNorm()  ----------------- */

 66:   /* Print info about transpose matrix */
 67:   MatNorm(tmat,NORM_FROBENIUS,&normf);
 68:   MatNorm(tmat,NORM_1,&norm1);
 69:   MatNorm(tmat,NORM_INFINITY,&normi);
 70:   PetscPrintf(PETSC_COMM_WORLD,"transpose: Frobenious norm = %g, one norm = %g, infinity norm = %gn",
 71:                      normf,norm1,normi);
 72:   MatView(tmat,PETSC_VIEWER_STDOUT_WORLD);

 74:   /* ----------------- Test MatAXPY()  ----------------- */

 76:   if (mat && !rect) {
 77:     PetscScalar alpha = 1.0;
 78:     PetscOptionsGetScalar(PETSC_NULL,"-alpha",&alpha,PETSC_NULL);
 79:     PetscPrintf(PETSC_COMM_WORLD,"matrix addition:  B = B + alpha * An");
 80:     MatAXPY(&alpha,mat,tmat,DIFFERENT_NONZERO_PATTERN);
 81:     MatView(tmat,PETSC_VIEWER_STDOUT_WORLD);
 82:   }

 84:   /* Free data structures */
 85:   MatDestroy(tmat);
 86:   if (mat) {MatDestroy(mat);}

 88:   PetscFinalize();
 89:   return 0;
 90: }
 91: