[petsc-users] array and vec

[Jed Brown]

On Thu, 15 Apr 2010 21:17:19 +0800, "=?gb2312?B?s8LA1sa9?=" <chenleping at yahoo.cn> wrote:
> petsc teams,
> 
> for following definitions:
> 
> double precision u(n)
> Vec  v
> 
> then, how can I actualize mutual updating between u(n) and v?

I'm not sure what you mean, if these are the same quantity then they
shouldn't be stored in separate locations.  See VecGetArray:

  http://www.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-current/docs/manualpages/Vec/VecGetArray.html

Jed