1c4762a1bSJed Brown static char help[] = "Test MATMFFD for the rectangular case\n\n"; 2c4762a1bSJed Brown 3c4762a1bSJed Brown #include <petscmat.h> 4c4762a1bSJed Brown 5c4762a1bSJed Brown static PetscErrorCode myF(void* ctx,Vec x,Vec y) 6c4762a1bSJed Brown { 7c4762a1bSJed Brown const PetscScalar *ax; 8c4762a1bSJed Brown PetscScalar *ay; 9c4762a1bSJed Brown PetscInt i,j,m,n; 10c4762a1bSJed Brown 11c4762a1bSJed Brown PetscFunctionBegin; 12*9566063dSJacob Faibussowitsch PetscCall(VecGetArrayRead(x,&ax)); 13*9566063dSJacob Faibussowitsch PetscCall(VecGetArray(y,&ay)); 14*9566063dSJacob Faibussowitsch PetscCall(VecGetLocalSize(y,&m)); 15*9566063dSJacob Faibussowitsch PetscCall(VecGetLocalSize(x,&n)); 16c4762a1bSJed Brown for (i=0;i<m;i++) { 17c4762a1bSJed Brown PetscScalar xx,yy; 18c4762a1bSJed Brown 19c4762a1bSJed Brown yy = 0.0; 20c4762a1bSJed Brown for (j=0;j<n;j++) { 21c4762a1bSJed Brown xx = PetscPowScalarInt(ax[j],i+1); 22c4762a1bSJed Brown yy += xx; 23c4762a1bSJed Brown } 24c4762a1bSJed Brown ay[i] = yy; 25c4762a1bSJed Brown } 26*9566063dSJacob Faibussowitsch PetscCall(VecRestoreArray(y,&ay)); 27*9566063dSJacob Faibussowitsch PetscCall(VecRestoreArrayRead(x,&ax)); 28c4762a1bSJed Brown PetscFunctionReturn(0); 29c4762a1bSJed Brown } 30c4762a1bSJed Brown 31c4762a1bSJed Brown int main(int argc,char **args) 32c4762a1bSJed Brown { 33c4762a1bSJed Brown Mat A,B; 34c4762a1bSJed Brown Vec base; 35c4762a1bSJed Brown PetscInt m = 3 ,n = 2; 36c4762a1bSJed Brown 37*9566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc,&args,(char*)0,help)); 38*9566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL)); 39*9566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL)); 40*9566063dSJacob Faibussowitsch PetscCall(MatCreateMFFD(PETSC_COMM_WORLD,PETSC_DECIDE,PETSC_DECIDE,m,n,&A)); 41*9566063dSJacob Faibussowitsch PetscCall(MatCreateVecs(A,&base,NULL)); 42*9566063dSJacob Faibussowitsch PetscCall(VecSet(base,2.0)); 43*9566063dSJacob Faibussowitsch PetscCall(MatMFFDSetFunction(A,myF,NULL)); 44*9566063dSJacob Faibussowitsch PetscCall(MatMFFDSetBase(A,base,NULL)); 45*9566063dSJacob Faibussowitsch PetscCall(MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY)); 46*9566063dSJacob Faibussowitsch PetscCall(MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY)); 47*9566063dSJacob Faibussowitsch PetscCall(MatComputeOperator(A,NULL,&B)); 48*9566063dSJacob Faibussowitsch PetscCall(VecDestroy(&base)); 49*9566063dSJacob Faibussowitsch PetscCall(MatDestroy(&A)); 50*9566063dSJacob Faibussowitsch PetscCall(MatDestroy(&B)); 51*9566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 52b122ec5aSJacob Faibussowitsch return 0; 53c4762a1bSJed Brown } 54c4762a1bSJed Brown 55c4762a1bSJed Brown /*TEST 56c4762a1bSJed Brown 57c4762a1bSJed Brown test: 58c4762a1bSJed Brown nsize: {{1 2 3 4}} 59c4762a1bSJed Brown 60c4762a1bSJed Brown TEST*/ 61