1 static char help[] = "Tests MatCreateConstantDiagonal().\n" 2 "\n"; 3 4 #include <petscmat.h> 5 6 /*T 7 Concepts: Mat 8 T*/ 9 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; 16 17 PetscCall(PetscInitialize(&argc,&args,(char*)0,help)); 18 19 PetscCall(MatCreateConstantDiagonal(PETSC_COMM_WORLD,PETSC_DETERMINE,PETSC_DETERMINE,20,20,3.0,&A)); 20 PetscCall(MatCreateVecs(A,&X,&Y)); 21 PetscCall(MatView(A,PETSC_VIEWER_STDOUT_WORLD)); 22 23 PetscCall(VecSetRandom(X,NULL)); 24 PetscCall(VecNorm(X,NORM_2,&xnorm)); 25 PetscCall(MatMult(A,X,Y)); 26 PetscCall(VecNorm(Y,NORM_2,&ynorm)); 27 PetscCheckFalse(PetscAbsReal(ynorm - 3*xnorm) > PETSC_SMALL,PETSC_COMM_WORLD,PETSC_ERR_PLIB,"Expected norm %g actual norm %g",(double)(3*xnorm),(double)ynorm); 28 PetscCall(MatShift(A,5.0)); 29 PetscCall(MatScale(A,.5)); 30 PetscCall(MatView(A,PETSC_VIEWER_STDOUT_WORLD)); 31 PetscCall(MatNorm(A,NORM_FROBENIUS,&anorm)); 32 PetscCheckFalse(PetscAbsReal(anorm - 4.0) > PETSC_SMALL,PETSC_COMM_WORLD,PETSC_ERR_PLIB,"Expected norm 4.0 actual norm %g",(double)anorm); 33 34 /* Convert to AIJ (exercises MatGetRow/MatRestoreRow) */ 35 PetscCall(MatConvert(A,MATAIJ,MAT_INITIAL_MATRIX,&B)); 36 PetscCall(MatMultEqual(A,B,10,&flg)); 37 if (!flg) PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Error MatMult\n")); 38 PetscCall(MatMultAddEqual(A,B,10,&flg)); 39 if (!flg) PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Error MatMultAdd\n")); 40 PetscCall(MatMultTransposeEqual(A,B,10,&flg)); 41 if (!flg) PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Error MatMultTranspose\n")); 42 PetscCall(MatMultTransposeAddEqual(A,B,10,&flg)); 43 if (!flg) PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Error MatMultTransposeAdd\n")); 44 45 PetscCall(MatGetDiagonal(A,Y)); 46 PetscCall(MatGetFactor(A,MATSOLVERPETSC,MAT_FACTOR_LU,&Af)); 47 PetscCall(MatLUFactorSymbolic(Af,A,NULL,NULL,NULL)); 48 PetscCall(MatLUFactorNumeric(Af,A,NULL)); 49 PetscCall(MatSolve(Af,X,Y)); 50 PetscCall(VecNorm(Y,NORM_2,&ynorm)); 51 PetscCheckFalse(PetscAbsReal(ynorm - xnorm/4) > PETSC_SMALL,PETSC_COMM_WORLD,PETSC_ERR_PLIB,"Expected norm %g actual norm %g",(double)(.25*xnorm),(double)ynorm); 52 53 PetscCall(MatDestroy(&A)); 54 PetscCall(MatDestroy(&B)); 55 PetscCall(MatDestroy(&Af)); 56 PetscCall(VecDestroy(&X)); 57 PetscCall(VecDestroy(&Y)); 58 59 PetscCall(PetscFinalize()); 60 return 0; 61 } 62 63 /*TEST 64 65 test: 66 nsize: 2 67 68 TEST*/ 69