Actual source code: ex185.c

  1: static char help[] = "Tests MatCreateConstantDiagonal().\n"
  2: "\n";

  4: #include <petscmat.h>

  6: /*T
  7:     Concepts: Mat
  8: T*/

 10: int main(int argc, char **args)
 11: {
 12:   Vec            X, Y;
 13:   Mat            A,B,Af;
 14:   PetscBool      flg;
 15:   PetscReal      xnorm,ynorm,anorm;

 17:   PetscInitialize(&argc,&args,(char*)0,help);

 19:   MatCreateConstantDiagonal(PETSC_COMM_WORLD,PETSC_DETERMINE,PETSC_DETERMINE,20,20,3.0,&A);
 20:   MatCreateVecs(A,&X,&Y);
 21:   MatView(A,PETSC_VIEWER_STDOUT_WORLD);

 23:   VecSetRandom(X,NULL);
 24:   VecNorm(X,NORM_2,&xnorm);
 25:   MatMult(A,X,Y);
 26:   VecNorm(Y,NORM_2,&ynorm);
 28:   MatShift(A,5.0);
 29:   MatScale(A,.5);
 30:   MatView(A,PETSC_VIEWER_STDOUT_WORLD);
 31:   MatNorm(A,NORM_FROBENIUS,&anorm);

 34:   /* Convert to AIJ (exercises MatGetRow/MatRestoreRow) */
 35:   MatConvert(A,MATAIJ,MAT_INITIAL_MATRIX,&B);
 36:   MatMultEqual(A,B,10,&flg);
 37:   if (!flg) PetscPrintf(PETSC_COMM_WORLD,"Error MatMult\n");
 38:   MatMultAddEqual(A,B,10,&flg);
 39:   if (!flg) PetscPrintf(PETSC_COMM_WORLD,"Error MatMultAdd\n");
 40:   MatMultTransposeEqual(A,B,10,&flg);
 41:   if (!flg) PetscPrintf(PETSC_COMM_WORLD,"Error MatMultTranspose\n");
 42:   MatMultTransposeAddEqual(A,B,10,&flg);
 43:   if (!flg) PetscPrintf(PETSC_COMM_WORLD,"Error MatMultTransposeAdd\n");

 45:   MatGetDiagonal(A,Y);
 46:   MatGetFactor(A,MATSOLVERPETSC,MAT_FACTOR_LU,&Af);
 47:   MatLUFactorSymbolic(Af,A,NULL,NULL,NULL);
 48:   MatLUFactorNumeric(Af,A,NULL);
 49:   MatSolve(Af,X,Y);
 50:   VecNorm(Y,NORM_2,&ynorm);

 53:   MatDestroy(&A);
 54:   MatDestroy(&B);
 55:   MatDestroy(&Af);
 56:   VecDestroy(&X);
 57:   VecDestroy(&Y);

 59:   PetscFinalize();
 60:   return 0;
 61: }

 63: /*TEST

 65:   test:
 66:     nsize: 2

 68: TEST*/