Could you please share a runnable piece of code? I’ve tried to generate an example myself, and I don’t get 0 for the norm of G.
Thanks, Pierre > On 6 Jan 2026, at 11:12 AM, Michael Wick <[email protected]> wrote: > > Hello PETSc users, > > I have a VECNEST norm issue and would appreciate help. > > I create a nest vector: > VecCreateNest(PETSC_COMM_WORLD, 2, NULL, subG, &G); > > But: > VecNorm(G, NORM_2, &nG) returns 0 > > While the sub-vectors are clearly nonzero: > VecNestGetSubVec(G,0,&v0); VecNorm(v0,NORM_2,&n0); // n0 > 0 > VecNestGetSubVec(G,1,&v1); VecNorm(v1,NORM_2,&n1); // n1 > 0 > > Can someone give a hint on what might go wrong? > > Thanks, > > M >
