1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Tests the use of MatSolveTranspose().\n\n"; 3c4762a1bSJed Brown 4c4762a1bSJed Brown #include <petscmat.h> 5c4762a1bSJed Brown 6c4762a1bSJed Brown int main(int argc,char **args) 7c4762a1bSJed Brown { 8c4762a1bSJed Brown Mat C,A; 9c4762a1bSJed Brown PetscInt i,j,m = 5,n = 5,Ii,J; 10c4762a1bSJed Brown PetscScalar v,five = 5.0,one = 1.0; 11c4762a1bSJed Brown IS isrow,row,col; 12c4762a1bSJed Brown Vec x,u,b; 13c4762a1bSJed Brown PetscReal norm; 14c4762a1bSJed Brown MatFactorInfo info; 15c4762a1bSJed Brown 16*b122ec5aSJacob Faibussowitsch CHKERRQ(PetscInitialize(&argc,&args,(char*)0,help)); 175f80ce2aSJacob Faibussowitsch CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL)); 185f80ce2aSJacob Faibussowitsch CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL)); 19c4762a1bSJed Brown 205f80ce2aSJacob Faibussowitsch CHKERRQ(MatCreateSeqAIJ(PETSC_COMM_SELF,m*n,m*n,5,NULL,&C)); 215f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetUp(C)); 22c4762a1bSJed Brown 23c4762a1bSJed Brown /* create the matrix for the five point stencil, YET AGAIN*/ 24c4762a1bSJed Brown for (i=0; i<m; i++) { 25c4762a1bSJed Brown for (j=0; j<n; j++) { 26c4762a1bSJed Brown v = -1.0; Ii = j + n*i; 275f80ce2aSJacob Faibussowitsch if (i>0) {J = Ii - n; CHKERRQ(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 285f80ce2aSJacob Faibussowitsch if (i<m-1) {J = Ii + n; CHKERRQ(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 295f80ce2aSJacob Faibussowitsch if (j>0) {J = Ii - 1; CHKERRQ(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 305f80ce2aSJacob Faibussowitsch if (j<n-1) {J = Ii + 1; CHKERRQ(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 315f80ce2aSJacob Faibussowitsch v = 4.0; CHKERRQ(MatSetValues(C,1,&Ii,1,&Ii,&v,INSERT_VALUES)); 32c4762a1bSJed Brown } 33c4762a1bSJed Brown } 345f80ce2aSJacob Faibussowitsch CHKERRQ(MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY)); 355f80ce2aSJacob Faibussowitsch CHKERRQ(MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY)); 36c4762a1bSJed Brown 375f80ce2aSJacob Faibussowitsch CHKERRQ(ISCreateStride(PETSC_COMM_SELF,(m*n)/2,0,2,&isrow)); 385f80ce2aSJacob Faibussowitsch CHKERRQ(MatZeroRowsIS(C,isrow,five,0,0)); 39c4762a1bSJed Brown 405f80ce2aSJacob Faibussowitsch CHKERRQ(VecCreateSeq(PETSC_COMM_SELF,m*n,&u)); 415f80ce2aSJacob Faibussowitsch CHKERRQ(VecDuplicate(u,&x)); 425f80ce2aSJacob Faibussowitsch CHKERRQ(VecDuplicate(u,&b)); 435f80ce2aSJacob Faibussowitsch CHKERRQ(VecSet(u,one)); 44c4762a1bSJed Brown 455f80ce2aSJacob Faibussowitsch CHKERRQ(MatMultTranspose(C,u,b)); 46c4762a1bSJed Brown 47c4762a1bSJed Brown /* Set default ordering to be Quotient Minimum Degree; also read 48c4762a1bSJed Brown orderings from the options database */ 495f80ce2aSJacob Faibussowitsch CHKERRQ(MatGetOrdering(C,MATORDERINGQMD,&row,&col)); 50c4762a1bSJed Brown 515f80ce2aSJacob Faibussowitsch CHKERRQ(MatFactorInfoInitialize(&info)); 525f80ce2aSJacob Faibussowitsch CHKERRQ(MatGetFactor(C,MATSOLVERPETSC,MAT_FACTOR_LU,&A)); 535f80ce2aSJacob Faibussowitsch CHKERRQ(MatLUFactorSymbolic(A,C,row,col,&info)); 545f80ce2aSJacob Faibussowitsch CHKERRQ(MatLUFactorNumeric(A,C,&info)); 555f80ce2aSJacob Faibussowitsch CHKERRQ(MatSolveTranspose(A,b,x)); 56c4762a1bSJed Brown 575f80ce2aSJacob Faibussowitsch CHKERRQ(ISView(row,PETSC_VIEWER_STDOUT_SELF)); 585f80ce2aSJacob Faibussowitsch CHKERRQ(VecAXPY(x,-1.0,u)); 595f80ce2aSJacob Faibussowitsch CHKERRQ(VecNorm(x,NORM_2,&norm)); 605f80ce2aSJacob Faibussowitsch CHKERRQ(PetscPrintf(PETSC_COMM_SELF,"Norm of error %g\n",(double)norm)); 61c4762a1bSJed Brown 625f80ce2aSJacob Faibussowitsch CHKERRQ(ISDestroy(&row)); 635f80ce2aSJacob Faibussowitsch CHKERRQ(ISDestroy(&col)); 645f80ce2aSJacob Faibussowitsch CHKERRQ(ISDestroy(&isrow)); 655f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&u)); 665f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&x)); 675f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&b)); 685f80ce2aSJacob Faibussowitsch CHKERRQ(MatDestroy(&C)); 695f80ce2aSJacob Faibussowitsch CHKERRQ(MatDestroy(&A)); 70*b122ec5aSJacob Faibussowitsch CHKERRQ(PetscFinalize()); 71*b122ec5aSJacob Faibussowitsch return 0; 72c4762a1bSJed Brown } 73c4762a1bSJed Brown 74c4762a1bSJed Brown /*TEST 75c4762a1bSJed Brown 76c4762a1bSJed Brown test: 77c4762a1bSJed Brown 78c4762a1bSJed Brown TEST*/ 79