Date: 2013-07-02T14:40:12+00:00

Actual source code: ex7.c
petsc-3.4.2 2013-07-02

      2: static char help[] = "Demonstrates a scatter with a stride and general index set.\n\n";

      4: #include <petscvec.h>

      8: int main(int argc,char **argv)
      9: {
     11:   PetscInt       n   = 6,idx1[3] = {0,1,2},loc[6] = {0,1,2,3,4,5};
     12:   PetscScalar    two = 2.0,vals[6] = {10,11,12,13,14,15};
     13:   Vec            x,y;
     14:   IS             is1,is2;
     15:   VecScatter     ctx = 0;

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

     19:   /* create two vectors */
     20:   VecCreateSeq(PETSC_COMM_SELF,n,&x);
     21:   VecDuplicate(x,&y);

     23:   /* create two index sets */
     24:   ISCreateStride(PETSC_COMM_SELF,3,0,2,&is1);
     25:   ISCreateGeneral(PETSC_COMM_SELF,3,idx1,PETSC_COPY_VALUES,&is2);

     27:   VecSetValues(x,6,loc,vals,INSERT_VALUES);
     28:   VecView(x,PETSC_VIEWER_STDOUT_SELF);
     29:   PetscPrintf(PETSC_COMM_SELF,"----\n");
     30:   VecSet(y,two);
     31:   VecScatterCreate(x,is1,y,is2,&ctx);
     32:   VecScatterBegin(ctx,x,y,INSERT_VALUES,SCATTER_FORWARD);
     33:   VecScatterEnd(ctx,x,y,INSERT_VALUES,SCATTER_FORWARD);
     34:   VecScatterDestroy(&ctx);

     36:   VecView(y,PETSC_VIEWER_STDOUT_SELF);

     38:   ISDestroy(&is1);
     39:   ISDestroy(&is2);
     40:   VecDestroy(&x);
     41:   VecDestroy(&y);

     43:   PetscFinalize();
     44:   return 0;
     45: }