1 2 static char help[] = "Demonstrates a scatter with a stride and general index set.\n\n"; 3 4 #include <petscvec.h> 5 6 int main(int argc,char **argv) 7 { 8 PetscErrorCode ierr; 9 PetscInt n = 6,idx1[3] = {0,1,2},loc[6] = {0,1,2,3,4,5}; 10 PetscScalar two = 2.0,vals[6] = {10,11,12,13,14,15}; 11 Vec x,y; 12 IS is1,is2; 13 VecScatter ctx = 0; 14 15 ierr = PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr; 16 17 /* create two vectors */ 18 CHKERRQ(VecCreateSeq(PETSC_COMM_SELF,n,&x)); 19 CHKERRQ(VecDuplicate(x,&y)); 20 21 /* create two index sets */ 22 CHKERRQ(ISCreateStride(PETSC_COMM_SELF,3,0,2,&is1)); 23 CHKERRQ(ISCreateGeneral(PETSC_COMM_SELF,3,idx1,PETSC_COPY_VALUES,&is2)); 24 25 CHKERRQ(VecSetValues(x,6,loc,vals,INSERT_VALUES)); 26 CHKERRQ(VecView(x,PETSC_VIEWER_STDOUT_SELF)); 27 CHKERRQ(PetscPrintf(PETSC_COMM_SELF,"----\n")); 28 CHKERRQ(VecSet(y,two)); 29 CHKERRQ(VecScatterCreate(x,is1,y,is2,&ctx)); 30 CHKERRQ(VecScatterBegin(ctx,x,y,INSERT_VALUES,SCATTER_FORWARD)); 31 CHKERRQ(VecScatterEnd(ctx,x,y,INSERT_VALUES,SCATTER_FORWARD)); 32 CHKERRQ(VecScatterDestroy(&ctx)); 33 34 CHKERRQ(VecView(y,PETSC_VIEWER_STDOUT_SELF)); 35 36 CHKERRQ(ISDestroy(&is1)); 37 CHKERRQ(ISDestroy(&is2)); 38 CHKERRQ(VecDestroy(&x)); 39 CHKERRQ(VecDestroy(&y)); 40 41 ierr = PetscFinalize(); 42 return ierr; 43 } 44 45 /*TEST 46 47 test: 48 49 TEST*/ 50