[petsc-users] array and vec

[陈乐平（Leping Chen）]

hello, petsc teams,

when I use FormFuncion(), I need use a value of x;

but x is defined by Vec, I don't know how to get  a value of x, for example, the 3rd value.

thanks,

leping
  



发件人： Jed Brown 
发送时间： 2010-04-16  21:21:47 
收件人： chenleping; PETSc users list 
抄送： 
主题： Re: [petsc-users] array and vec 
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
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